diff --git a/Mathbin/LinearAlgebra/BilinearMap.lean b/Mathbin/LinearAlgebra/BilinearMap.lean
index 780e44dfc0..ac7fcced9e 100644
--- a/Mathbin/LinearAlgebra/BilinearMap.lean
+++ b/Mathbin/LinearAlgebra/BilinearMap.lean
@@ -75,6 +75,12 @@ variable {ρ₁₂ : R →+* R₂} {σ₁₂ : S →+* S₂}
 
 variable (ρ₁₂ σ₁₂)
 
+/- warning: linear_map.mk₂'ₛₗ -> LinearMap.mk₂'ₛₗ is a dubious translation:
+lean 3 declaration is
+  forall {R : Type.{u1}} [_inst_1 : Semiring.{u1} R] {S : Type.{u2}} [_inst_2 : Semiring.{u2} S] {R₂ : Type.{u3}} [_inst_3 : Semiring.{u3} R₂] {S₂ : Type.{u4}} [_inst_4 : Semiring.{u4} S₂] {M : Type.{u5}} {N : Type.{u6}} {P : Type.{u7}} [_inst_5 : AddCommMonoid.{u5} M] [_inst_6 : AddCommMonoid.{u6} N] [_inst_7 : AddCommMonoid.{u7} P] [_inst_16 : Module.{u1, u5} R M _inst_1 _inst_5] [_inst_17 : Module.{u2, u6} S N _inst_2 _inst_6] [_inst_18 : Module.{u3, u7} R₂ P _inst_3 _inst_7] [_inst_19 : Module.{u4, u7} S₂ P _inst_4 _inst_7] [_inst_30 : SMulCommClass.{u4, u3, u7} S₂ R₂ P (SMulZeroClass.toHasSmul.{u4, u7} S₂ P (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (SMulWithZero.toSmulZeroClass.{u4, u7} S₂ P (MulZeroClass.toHasZero.{u4} S₂ (MulZeroOneClass.toMulZeroClass.{u4} S₂ (MonoidWithZero.toMulZeroOneClass.{u4} S₂ (Semiring.toMonoidWithZero.{u4} S₂ _inst_4)))) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (MulActionWithZero.toSMulWithZero.{u4, u7} S₂ P (Semiring.toMonoidWithZero.{u4} S₂ _inst_4) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (Module.toMulActionWithZero.{u4, u7} S₂ P _inst_4 _inst_7 _inst_19)))) (SMulZeroClass.toHasSmul.{u3, u7} R₂ P (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (SMulWithZero.toSmulZeroClass.{u3, u7} R₂ P (MulZeroClass.toHasZero.{u3} R₂ (MulZeroOneClass.toMulZeroClass.{u3} R₂ (MonoidWithZero.toMulZeroOneClass.{u3} R₂ (Semiring.toMonoidWithZero.{u3} R₂ _inst_3)))) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (MulActionWithZero.toSMulWithZero.{u3, u7} R₂ P (Semiring.toMonoidWithZero.{u3} R₂ _inst_3) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (Module.toMulActionWithZero.{u3, u7} R₂ P _inst_3 _inst_7 _inst_18))))] (ρ₁₂ : RingHom.{u1, u3} R R₂ (Semiring.toNonAssocSemiring.{u1} R _inst_1) (Semiring.toNonAssocSemiring.{u3} R₂ _inst_3)) (σ₁₂ : RingHom.{u2, u4} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u4} S₂ _inst_4)) (f : M -> N -> P), (forall (m₁ : M) (m₂ : M) (n : N), Eq.{succ u7} P (f (HAdd.hAdd.{u5, u5, u5} M M M (instHAdd.{u5} M (AddZeroClass.toHasAdd.{u5} M (AddMonoid.toAddZeroClass.{u5} M (AddCommMonoid.toAddMonoid.{u5} M _inst_5)))) m₁ m₂) n) (HAdd.hAdd.{u7, u7, u7} P P P (instHAdd.{u7} P (AddZeroClass.toHasAdd.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)))) (f m₁ n) (f m₂ n))) -> (forall (c : R) (m : M) (n : N), Eq.{succ u7} P (f (SMul.smul.{u1, u5} R M (SMulZeroClass.toHasSmul.{u1, u5} R M (AddZeroClass.toHasZero.{u5} M (AddMonoid.toAddZeroClass.{u5} M (AddCommMonoid.toAddMonoid.{u5} M _inst_5))) (SMulWithZero.toSmulZeroClass.{u1, u5} R M 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+but is expected to have type
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(x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) _x) (MulHomClass.toFunLike.{max u2 u4, u2, u4} (RingHom.{u2, u4} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u4} S₂ _inst_4)) S S₂ (NonUnitalNonAssocSemiring.toMul.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S (Semiring.toNonAssocSemiring.{u2} S _inst_2))) (NonUnitalNonAssocSemiring.toMul.{u4} S₂ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u4} S₂ (Semiring.toNonAssocSemiring.{u4} S₂ _inst_4))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u4, u2, u4} (RingHom.{u2, u4} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u4} S₂ _inst_4)) S S₂ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S (Semiring.toNonAssocSemiring.{u2} S _inst_2)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u4} S₂ (Semiring.toNonAssocSemiring.{u4} S₂ _inst_4)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u4, u2, u4} (RingHom.{u2, u4} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u4} S₂ _inst_4)) S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u4} S₂ _inst_4) (RingHom.instRingHomClassRingHom.{u2, u4} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u4} S₂ _inst_4))))) σ₁₂ c) (f m n))) -> (LinearMap.{u1, u3, u5, max u7 u6} R R₂ _inst_1 _inst_3 ρ₁₂ M (LinearMap.{u2, u4, u6, u7} S S₂ _inst_2 _inst_4 σ₁₂ N P _inst_6 _inst_7 _inst_17 _inst_19) _inst_5 (LinearMap.addCommMonoid.{u2, u4, u6, u7} S S₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂) _inst_16 (LinearMap.instModuleLinearMapAddCommMonoid.{u2, u4, u3, u6, u7} S S₂ R₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂ _inst_3 _inst_18 _inst_30))
+Case conversion may be inaccurate. Consider using '#align linear_map.mk₂'ₛₗ LinearMap.mk₂'ₛₗₓ'. -/
 /-- Create a bilinear map from a function that is semilinear in each component.
 See `mk₂'` and `mk₂` for the linear case. -/
 def mk₂'ₛₗ (f : M → N → P) (H1 : ∀ m₁ m₂ n, f (m₁ + m₂) n = f m₁ n + f m₂ n)
@@ -92,6 +98,12 @@ def mk₂'ₛₗ (f : M → N → P) (H1 : ∀ m₁ m₂ n, f (m₁ + m₂) n =
 
 variable {ρ₁₂ σ₁₂}
 
+/- warning: linear_map.mk₂'ₛₗ_apply -> LinearMap.mk₂'ₛₗ_apply is a dubious translation:
+lean 3 declaration is
+  forall {R : Type.{u1}} [_inst_1 : Semiring.{u1} R] {S : Type.{u2}} [_inst_2 : Semiring.{u2} S] {R₂ : Type.{u3}} [_inst_3 : Semiring.{u3} R₂] {S₂ : Type.{u4}} [_inst_4 : Semiring.{u4} S₂] {M : Type.{u5}} {N : Type.{u6}} {P : Type.{u7}} [_inst_5 : AddCommMonoid.{u5} M] [_inst_6 : AddCommMonoid.{u6} N] [_inst_7 : AddCommMonoid.{u7} P] [_inst_16 : Module.{u1, u5} R M _inst_1 _inst_5] [_inst_17 : Module.{u2, u6} S N _inst_2 _inst_6] [_inst_18 : Module.{u3, u7} R₂ P _inst_3 _inst_7] [_inst_19 : Module.{u4, u7} S₂ P _inst_4 _inst_7] [_inst_30 : SMulCommClass.{u4, u3, u7} S₂ R₂ P (SMulZeroClass.toHasSmul.{u4, u7} S₂ P (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (SMulWithZero.toSmulZeroClass.{u4, u7} S₂ P (MulZeroClass.toHasZero.{u4} S₂ (MulZeroOneClass.toMulZeroClass.{u4} S₂ (MonoidWithZero.toMulZeroOneClass.{u4} S₂ (Semiring.toMonoidWithZero.{u4} S₂ _inst_4)))) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P 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(Module.toMulActionWithZero.{u3, u7} R₂ P _inst_3 _inst_7 _inst_18))))] {ρ₁₂ : RingHom.{u1, u3} R R₂ (Semiring.toNonAssocSemiring.{u1} R _inst_1) (Semiring.toNonAssocSemiring.{u3} R₂ _inst_3)} {σ₁₂ : RingHom.{u2, u4} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u4} S₂ _inst_4)} (f : M -> N -> P) {H1 : forall (m₁ : M) (m₂ : M) (n : N), Eq.{succ u7} P (f (HAdd.hAdd.{u5, u5, u5} M M M (instHAdd.{u5} M (AddZeroClass.toHasAdd.{u5} M (AddMonoid.toAddZeroClass.{u5} M (AddCommMonoid.toAddMonoid.{u5} M _inst_5)))) m₁ m₂) n) (HAdd.hAdd.{u7, u7, u7} P P P (instHAdd.{u7} P (AddZeroClass.toHasAdd.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)))) (f m₁ n) (f m₂ n))} {H2 : forall (c : R) (m : M) (n : N), Eq.{succ u7} P (f (SMul.smul.{u1, u5} R M (SMulZeroClass.toHasSmul.{u1, u5} R M (AddZeroClass.toHasZero.{u5} M (AddMonoid.toAddZeroClass.{u5} M (AddCommMonoid.toAddMonoid.{u5} M _inst_5))) (SMulWithZero.toSmulZeroClass.{u1, u5} R 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+but is expected to have type
+  forall {R : Type.{u5}} [_inst_1 : Semiring.{u5} R] {S : Type.{u2}} [_inst_2 : Semiring.{u2} S] {R₂ : Type.{u4}} [_inst_3 : Semiring.{u4} R₂] {S₂ : Type.{u1}} [_inst_4 : Semiring.{u1} S₂] {M : Type.{u6}} {N : Type.{u3}} {P : Type.{u7}} [_inst_5 : AddCommMonoid.{u6} M] [_inst_6 : AddCommMonoid.{u3} N] [_inst_7 : AddCommMonoid.{u7} P] [_inst_16 : Module.{u5, u6} R M _inst_1 _inst_5] [_inst_17 : Module.{u2, u3} S N _inst_2 _inst_6] [_inst_18 : Module.{u4, u7} R₂ P _inst_3 _inst_7] [_inst_19 : Module.{u1, u7} S₂ P _inst_4 _inst_7] [_inst_30 : SMulCommClass.{u1, u4, u7} S₂ R₂ P (SMulZeroClass.toSMul.{u1, u7} S₂ P (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u1, u7} S₂ P (MonoidWithZero.toZero.{u1} S₂ (Semiring.toMonoidWithZero.{u1} S₂ _inst_4)) (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u1, u7} S₂ P (Semiring.toMonoidWithZero.{u1} S₂ _inst_4) (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (Module.toMulActionWithZero.{u1, u7} S₂ P _inst_4 _inst_7 _inst_19)))) (SMulZeroClass.toSMul.{u4, u7} R₂ P (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u4, u7} R₂ P (MonoidWithZero.toZero.{u4} R₂ (Semiring.toMonoidWithZero.{u4} R₂ _inst_3)) (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u4, u7} R₂ P (Semiring.toMonoidWithZero.{u4} R₂ _inst_3) (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (Module.toMulActionWithZero.{u4, u7} R₂ P _inst_3 _inst_7 _inst_18))))] {ρ₁₂ : RingHom.{u5, u4} R R₂ (Semiring.toNonAssocSemiring.{u5} R _inst_1) (Semiring.toNonAssocSemiring.{u4} R₂ _inst_3)} {σ₁₂ : RingHom.{u2, u1} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u1} S₂ _inst_4)} (f : M -> N -> P) {H1 : forall (m₁ : M) (m₂ : M) (n : N), Eq.{succ u7} P (f (HAdd.hAdd.{u6, u6, u6} M M M (instHAdd.{u6} M (AddZeroClass.toAdd.{u6} M (AddMonoid.toAddZeroClass.{u6} M (AddCommMonoid.toAddMonoid.{u6} M _inst_5)))) m₁ m₂) n) (HAdd.hAdd.{u7, u7, u7} P P P (instHAdd.{u7} P (AddZeroClass.toAdd.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)))) (f m₁ n) (f m₂ n))} {H2 : forall (c : R) (m : M) (n : N), Eq.{succ u7} P (f (HSMul.hSMul.{u5, u6, u6} R M M (instHSMul.{u5, u6} R M (SMulZeroClass.toSMul.{u5, u6} R M (AddMonoid.toZero.{u6} M (AddCommMonoid.toAddMonoid.{u6} M _inst_5)) (SMulWithZero.toSMulZeroClass.{u5, u6} R M (MonoidWithZero.toZero.{u5} R (Semiring.toMonoidWithZero.{u5} R _inst_1)) (AddMonoid.toZero.{u6} M (AddCommMonoid.toAddMonoid.{u6} M _inst_5)) (MulActionWithZero.toSMulWithZero.{u5, u6} R M (Semiring.toMonoidWithZero.{u5} R _inst_1) (AddMonoid.toZero.{u6} M (AddCommMonoid.toAddMonoid.{u6} M _inst_5)) (Module.toMulActionWithZero.{u5, u6} R M _inst_1 _inst_5 _inst_16))))) c m) n) (HSMul.hSMul.{u4, u7, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => R₂) c) P P (instHSMul.{u4, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => R₂) c) P (SMulZeroClass.toSMul.{u4, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => R₂) c) P (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u4, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => R₂) c) P (MonoidWithZero.toZero.{u4} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => R₂) c) (Semiring.toMonoidWithZero.{u4} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => R₂) c) _inst_3)) (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u4, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => R₂) c) P (Semiring.toMonoidWithZero.{u4} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => R₂) c) _inst_3) (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (Module.toMulActionWithZero.{u4, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => R₂) c) P _inst_3 _inst_7 _inst_18))))) (FunLike.coe.{max (succ u5) (succ u4), succ u5, succ u4} (RingHom.{u5, u4} R R₂ (Semiring.toNonAssocSemiring.{u5} R _inst_1) (Semiring.toNonAssocSemiring.{u4} R₂ _inst_3)) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => R₂) _x) (MulHomClass.toFunLike.{max u5 u4, u5, u4} (RingHom.{u5, u4} R R₂ (Semiring.toNonAssocSemiring.{u5} R _inst_1) (Semiring.toNonAssocSemiring.{u4} R₂ _inst_3)) R R₂ (NonUnitalNonAssocSemiring.toMul.{u5} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u5} R (Semiring.toNonAssocSemiring.{u5} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u4} R₂ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u4} R₂ (Semiring.toNonAssocSemiring.{u4} R₂ _inst_3))) (NonUnitalRingHomClass.toMulHomClass.{max u5 u4, u5, u4} (RingHom.{u5, u4} R R₂ (Semiring.toNonAssocSemiring.{u5} R _inst_1) (Semiring.toNonAssocSemiring.{u4} R₂ _inst_3)) R R₂ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u5} R (Semiring.toNonAssocSemiring.{u5} R _inst_1)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u4} R₂ (Semiring.toNonAssocSemiring.{u4} R₂ _inst_3)) (RingHomClass.toNonUnitalRingHomClass.{max u5 u4, u5, u4} (RingHom.{u5, u4} R R₂ (Semiring.toNonAssocSemiring.{u5} R _inst_1) (Semiring.toNonAssocSemiring.{u4} R₂ _inst_3)) R R₂ (Semiring.toNonAssocSemiring.{u5} R _inst_1) (Semiring.toNonAssocSemiring.{u4} R₂ _inst_3) (RingHom.instRingHomClassRingHom.{u5, u4} R R₂ (Semiring.toNonAssocSemiring.{u5} R _inst_1) (Semiring.toNonAssocSemiring.{u4} R₂ _inst_3))))) ρ₁₂ c) (f m n))} {H3 : forall (m : M) (n₁ : N) (n₂ : N), Eq.{succ u7} P (f m (HAdd.hAdd.{u3, u3, u3} N N N (instHAdd.{u3} N (AddZeroClass.toAdd.{u3} N (AddMonoid.toAddZeroClass.{u3} N (AddCommMonoid.toAddMonoid.{u3} N _inst_6)))) n₁ n₂)) (HAdd.hAdd.{u7, u7, u7} P P P (instHAdd.{u7} P (AddZeroClass.toAdd.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)))) (f m n₁) (f m n₂))} {H4 : forall (c : S) (m : M) (n : N), Eq.{succ u7} P (f m (HSMul.hSMul.{u2, u3, u3} S N N (instHSMul.{u2, u3} S N (SMulZeroClass.toSMul.{u2, u3} S N (AddMonoid.toZero.{u3} N (AddCommMonoid.toAddMonoid.{u3} N _inst_6)) (SMulWithZero.toSMulZeroClass.{u2, u3} S N (MonoidWithZero.toZero.{u2} S (Semiring.toMonoidWithZero.{u2} S _inst_2)) (AddMonoid.toZero.{u3} N (AddCommMonoid.toAddMonoid.{u3} N _inst_6)) (MulActionWithZero.toSMulWithZero.{u2, u3} S N (Semiring.toMonoidWithZero.{u2} S _inst_2) (AddMonoid.toZero.{u3} N (AddCommMonoid.toAddMonoid.{u3} N _inst_6)) (Module.toMulActionWithZero.{u2, u3} S N _inst_2 _inst_6 _inst_17))))) c n)) (HSMul.hSMul.{u1, u7, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) c) P P (instHSMul.{u1, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) c) P (SMulZeroClass.toSMul.{u1, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) c) P (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u1, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) c) P (MonoidWithZero.toZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) c) (Semiring.toMonoidWithZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) c) _inst_4)) (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u1, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) c) P (Semiring.toMonoidWithZero.{u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) c) _inst_4) (AddMonoid.toZero.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7)) (Module.toMulActionWithZero.{u1, u7} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) c) P _inst_4 _inst_7 _inst_19))))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u1} S₂ _inst_4)) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => S₂) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u1} S₂ _inst_4)) S S₂ (NonUnitalNonAssocSemiring.toMul.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S (Semiring.toNonAssocSemiring.{u2} S _inst_2))) (NonUnitalNonAssocSemiring.toMul.{u1} S₂ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S₂ (Semiring.toNonAssocSemiring.{u1} S₂ _inst_4))) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u1} S₂ _inst_4)) S S₂ (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S (Semiring.toNonAssocSemiring.{u2} S _inst_2)) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S₂ (Semiring.toNonAssocSemiring.{u1} S₂ _inst_4)) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u1} S₂ _inst_4)) S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u1} S₂ _inst_4) (RingHom.instRingHomClassRingHom.{u2, u1} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u1} S₂ _inst_4))))) σ₁₂ c) (f m n))} (m : M) (n : N), Eq.{succ u7} ((fun (x._@.Mathlib.Algebra.Module.LinearMap._hyg.6178 : N) => P) n) (FunLike.coe.{max (succ u3) (succ u7), succ u3, succ u7} ((fun (x._@.Mathlib.Algebra.Module.LinearMap._hyg.6178 : M) => LinearMap.{u2, u1, u3, u7} S S₂ _inst_2 _inst_4 σ₁₂ N P _inst_6 _inst_7 _inst_17 _inst_19) m) N (fun (_x : N) => (fun (x._@.Mathlib.Algebra.Module.LinearMap._hyg.6178 : N) => P) _x) (LinearMap.instFunLikeLinearMap.{u2, u1, u3, u7} S S₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂) (FunLike.coe.{max (max (succ u6) (succ u3)) (succ u7), succ u6, max (succ u3) (succ u7)} (LinearMap.{u5, u4, u6, max u7 u3} R R₂ _inst_1 _inst_3 ρ₁₂ M (LinearMap.{u2, u1, u3, u7} S S₂ _inst_2 _inst_4 σ₁₂ N P _inst_6 _inst_7 _inst_17 _inst_19) _inst_5 (LinearMap.addCommMonoid.{u2, u1, u3, u7} S S₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂) _inst_16 (LinearMap.instModuleLinearMapAddCommMonoid.{u2, u1, u4, u3, u7} S S₂ R₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂ _inst_3 _inst_18 _inst_30)) M (fun (_x : M) => (fun (x._@.Mathlib.Algebra.Module.LinearMap._hyg.6178 : M) => LinearMap.{u2, u1, u3, u7} S S₂ _inst_2 _inst_4 σ₁₂ N P _inst_6 _inst_7 _inst_17 _inst_19) _x) (LinearMap.instFunLikeLinearMap.{u5, u4, u6, max u3 u7} R R₂ M (LinearMap.{u2, u1, u3, u7} S S₂ _inst_2 _inst_4 σ₁₂ N P _inst_6 _inst_7 _inst_17 _inst_19) _inst_1 _inst_3 _inst_5 (LinearMap.addCommMonoid.{u2, u1, u3, u7} S S₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂) _inst_16 (LinearMap.instModuleLinearMapAddCommMonoid.{u2, u1, u4, u3, u7} S S₂ R₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂ _inst_3 _inst_18 _inst_30) ρ₁₂) (LinearMap.mk₂'ₛₗ.{u5, u2, u4, u1, u6, u3, u7} R _inst_1 S _inst_2 R₂ _inst_3 S₂ _inst_4 M N P _inst_5 _inst_6 _inst_7 _inst_16 _inst_17 _inst_18 _inst_19 _inst_30 ρ₁₂ σ₁₂ f H1 H2 H3 H4) m) n) (f m n)
+Case conversion may be inaccurate. Consider using '#align linear_map.mk₂'ₛₗ_apply LinearMap.mk₂'ₛₗ_applyₓ'. -/
 @[simp]
 theorem mk₂'ₛₗ_apply (f : M → N → P) {H1 H2 H3 H4} (m : M) (n : N) :
     (mk₂'ₛₗ ρ₁₂ σ₁₂ f H1 H2 H3 H4 : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) m n = f m n :=
@@ -100,6 +112,12 @@ theorem mk₂'ₛₗ_apply (f : M → N → P) {H1 H2 H3 H4} (m : M) (n : N) :
 
 variable (R S)
 
+/- warning: linear_map.mk₂' -> LinearMap.mk₂' is a dubious translation:
+lean 3 declaration is
+  forall (R : Type.{u1}) [_inst_1 : Semiring.{u1} R] (S : Type.{u2}) [_inst_2 : Semiring.{u2} S] {M : Type.{u3}} {N : Type.{u4}} {Pₗ : Type.{u5}} [_inst_5 : AddCommMonoid.{u3} M] [_inst_6 : AddCommMonoid.{u4} N] [_inst_12 : AddCommMonoid.{u5} Pₗ] [_inst_16 : Module.{u1, u3} R M _inst_1 _inst_5] [_inst_17 : Module.{u2, u4} S N _inst_2 _inst_6] [_inst_24 : Module.{u1, u5} R Pₗ _inst_1 _inst_12] [_inst_25 : Module.{u2, u5} S Pₗ _inst_2 _inst_12] [_inst_31 : SMulCommClass.{u2, u1, u5} S R Pₗ (SMulZeroClass.toHasSmul.{u2, u5} S Pₗ (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (SMulWithZero.toSmulZeroClass.{u2, u5} S Pₗ (MulZeroClass.toHasZero.{u2} S (MulZeroOneClass.toMulZeroClass.{u2} S (MonoidWithZero.toMulZeroOneClass.{u2} S (Semiring.toMonoidWithZero.{u2} S _inst_2)))) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (MulActionWithZero.toSMulWithZero.{u2, u5} S Pₗ (Semiring.toMonoidWithZero.{u2} S _inst_2) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (Module.toMulActionWithZero.{u2, u5} S Pₗ _inst_2 _inst_12 _inst_25)))) (SMulZeroClass.toHasSmul.{u1, u5} R Pₗ (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (SMulWithZero.toSmulZeroClass.{u1, u5} R Pₗ (MulZeroClass.toHasZero.{u1} R (MulZeroOneClass.toMulZeroClass.{u1} R (MonoidWithZero.toMulZeroOneClass.{u1} R (Semiring.toMonoidWithZero.{u1} R _inst_1)))) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (MulActionWithZero.toSMulWithZero.{u1, u5} R Pₗ (Semiring.toMonoidWithZero.{u1} R _inst_1) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (Module.toMulActionWithZero.{u1, u5} R Pₗ _inst_1 _inst_12 _inst_24))))] (f : M -> N -> Pₗ), (forall (m₁ : M) (m₂ : M) (n : N), Eq.{succ u5} Pₗ (f (HAdd.hAdd.{u3, u3, u3} M M M (instHAdd.{u3} M (AddZeroClass.toHasAdd.{u3} M (AddMonoid.toAddZeroClass.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5)))) m₁ m₂) n) (HAdd.hAdd.{u5, u5, u5} Pₗ Pₗ Pₗ (instHAdd.{u5} Pₗ (AddZeroClass.toHasAdd.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)))) (f m₁ n) (f m₂ n))) -> (forall (c : R) (m : M) (n : N), Eq.{succ u5} Pₗ (f (SMul.smul.{u1, u3} R M (SMulZeroClass.toHasSmul.{u1, u3} R M (AddZeroClass.toHasZero.{u3} M (AddMonoid.toAddZeroClass.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5))) (SMulWithZero.toSmulZeroClass.{u1, u3} R M (MulZeroClass.toHasZero.{u1} R (MulZeroOneClass.toMulZeroClass.{u1} R (MonoidWithZero.toMulZeroOneClass.{u1} R (Semiring.toMonoidWithZero.{u1} R _inst_1)))) (AddZeroClass.toHasZero.{u3} M (AddMonoid.toAddZeroClass.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5))) (MulActionWithZero.toSMulWithZero.{u1, u3} R M (Semiring.toMonoidWithZero.{u1} R _inst_1) (AddZeroClass.toHasZero.{u3} M (AddMonoid.toAddZeroClass.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5))) (Module.toMulActionWithZero.{u1, u3} R M _inst_1 _inst_5 _inst_16)))) c m) n) (SMul.smul.{u1, u5} R Pₗ (SMulZeroClass.toHasSmul.{u1, u5} R Pₗ (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (SMulWithZero.toSmulZeroClass.{u1, u5} R Pₗ (MulZeroClass.toHasZero.{u1} R (MulZeroOneClass.toMulZeroClass.{u1} R (MonoidWithZero.toMulZeroOneClass.{u1} R (Semiring.toMonoidWithZero.{u1} R _inst_1)))) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (MulActionWithZero.toSMulWithZero.{u1, u5} R Pₗ (Semiring.toMonoidWithZero.{u1} R _inst_1) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (Module.toMulActionWithZero.{u1, u5} R Pₗ _inst_1 _inst_12 _inst_24)))) c (f m n))) -> (forall (m : M) (n₁ : N) (n₂ : N), Eq.{succ u5} Pₗ (f m (HAdd.hAdd.{u4, u4, u4} N N N (instHAdd.{u4} N (AddZeroClass.toHasAdd.{u4} N (AddMonoid.toAddZeroClass.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6)))) n₁ n₂)) (HAdd.hAdd.{u5, u5, u5} Pₗ Pₗ Pₗ (instHAdd.{u5} Pₗ (AddZeroClass.toHasAdd.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)))) (f m n₁) (f m n₂))) -> (forall (c : S) (m : M) (n : N), Eq.{succ u5} Pₗ (f m (SMul.smul.{u2, u4} S N (SMulZeroClass.toHasSmul.{u2, u4} S N (AddZeroClass.toHasZero.{u4} N (AddMonoid.toAddZeroClass.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6))) (SMulWithZero.toSmulZeroClass.{u2, u4} S N (MulZeroClass.toHasZero.{u2} S (MulZeroOneClass.toMulZeroClass.{u2} S (MonoidWithZero.toMulZeroOneClass.{u2} S (Semiring.toMonoidWithZero.{u2} S _inst_2)))) (AddZeroClass.toHasZero.{u4} N (AddMonoid.toAddZeroClass.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6))) (MulActionWithZero.toSMulWithZero.{u2, u4} S N (Semiring.toMonoidWithZero.{u2} S _inst_2) (AddZeroClass.toHasZero.{u4} N (AddMonoid.toAddZeroClass.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6))) (Module.toMulActionWithZero.{u2, u4} S N _inst_2 _inst_6 _inst_17)))) c n)) (SMul.smul.{u2, u5} S Pₗ (SMulZeroClass.toHasSmul.{u2, u5} S Pₗ (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (SMulWithZero.toSmulZeroClass.{u2, u5} S Pₗ (MulZeroClass.toHasZero.{u2} S (MulZeroOneClass.toMulZeroClass.{u2} S (MonoidWithZero.toMulZeroOneClass.{u2} S (Semiring.toMonoidWithZero.{u2} S _inst_2)))) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (MulActionWithZero.toSMulWithZero.{u2, u5} S Pₗ (Semiring.toMonoidWithZero.{u2} S _inst_2) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (Module.toMulActionWithZero.{u2, u5} S Pₗ _inst_2 _inst_12 _inst_25)))) c (f m n))) -> (LinearMap.{u1, u1, u3, max u4 u5} R R _inst_1 _inst_1 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R _inst_1)) M (LinearMap.{u2, u2, u4, u5} S S _inst_2 _inst_2 (RingHom.id.{u2} S (Semiring.toNonAssocSemiring.{u2} S _inst_2)) N Pₗ _inst_6 _inst_12 _inst_17 _inst_25) _inst_5 (LinearMap.addCommMonoid.{u2, u2, u4, u5} S S N Pₗ _inst_2 _inst_2 _inst_6 _inst_12 _inst_17 _inst_25 (RingHom.id.{u2} S (Semiring.toNonAssocSemiring.{u2} S _inst_2))) _inst_16 (LinearMap.module.{u2, u2, u1, u4, u5} S S R N Pₗ _inst_2 _inst_2 _inst_6 _inst_12 _inst_17 _inst_25 (RingHom.id.{u2} S (Semiring.toNonAssocSemiring.{u2} S _inst_2)) _inst_1 _inst_24 _inst_31))
+but is expected to have type
+  forall (R : Type.{u1}) [_inst_1 : Semiring.{u1} R] (S : Type.{u2}) [_inst_2 : Semiring.{u2} S] {M : Type.{u3}} {N : Type.{u4}} {Pₗ : Type.{u5}} [_inst_5 : AddCommMonoid.{u3} M] [_inst_6 : AddCommMonoid.{u4} N] [_inst_12 : AddCommMonoid.{u5} Pₗ] [_inst_16 : Module.{u1, u3} R M _inst_1 _inst_5] [_inst_17 : Module.{u2, u4} S N _inst_2 _inst_6] [_inst_24 : Module.{u1, u5} R Pₗ _inst_1 _inst_12] [_inst_25 : Module.{u2, u5} S Pₗ _inst_2 _inst_12] [_inst_31 : SMulCommClass.{u2, u1, u5} S R Pₗ (SMulZeroClass.toSMul.{u2, u5} S Pₗ (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (SMulWithZero.toSMulZeroClass.{u2, u5} S Pₗ (MonoidWithZero.toZero.{u2} S (Semiring.toMonoidWithZero.{u2} S _inst_2)) (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (MulActionWithZero.toSMulWithZero.{u2, u5} S Pₗ (Semiring.toMonoidWithZero.{u2} S _inst_2) (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (Module.toMulActionWithZero.{u2, u5} S Pₗ _inst_2 _inst_12 _inst_25)))) (SMulZeroClass.toSMul.{u1, u5} R Pₗ (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (SMulWithZero.toSMulZeroClass.{u1, u5} R Pₗ (MonoidWithZero.toZero.{u1} R (Semiring.toMonoidWithZero.{u1} R _inst_1)) (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (MulActionWithZero.toSMulWithZero.{u1, u5} R Pₗ (Semiring.toMonoidWithZero.{u1} R _inst_1) (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (Module.toMulActionWithZero.{u1, u5} R Pₗ _inst_1 _inst_12 _inst_24))))] (f : M -> N -> Pₗ), (forall (m₁ : M) (m₂ : M) (n : N), Eq.{succ u5} Pₗ (f (HAdd.hAdd.{u3, u3, u3} M M M (instHAdd.{u3} M (AddZeroClass.toAdd.{u3} M (AddMonoid.toAddZeroClass.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5)))) m₁ m₂) n) (HAdd.hAdd.{u5, u5, u5} Pₗ Pₗ Pₗ (instHAdd.{u5} Pₗ (AddZeroClass.toAdd.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)))) (f m₁ n) (f m₂ n))) -> (forall (c : R) (m : M) (n : N), Eq.{succ u5} Pₗ (f (HSMul.hSMul.{u1, u3, u3} R M M (instHSMul.{u1, u3} R M (SMulZeroClass.toSMul.{u1, u3} R M (AddMonoid.toZero.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5)) (SMulWithZero.toSMulZeroClass.{u1, u3} R M (MonoidWithZero.toZero.{u1} R (Semiring.toMonoidWithZero.{u1} R _inst_1)) (AddMonoid.toZero.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5)) (MulActionWithZero.toSMulWithZero.{u1, u3} R M (Semiring.toMonoidWithZero.{u1} R _inst_1) (AddMonoid.toZero.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5)) (Module.toMulActionWithZero.{u1, u3} R M _inst_1 _inst_5 _inst_16))))) c m) n) (HSMul.hSMul.{u1, u5, u5} R Pₗ Pₗ (instHSMul.{u1, u5} R Pₗ (SMulZeroClass.toSMul.{u1, u5} R Pₗ (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (SMulWithZero.toSMulZeroClass.{u1, u5} R Pₗ (MonoidWithZero.toZero.{u1} R (Semiring.toMonoidWithZero.{u1} R _inst_1)) (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (MulActionWithZero.toSMulWithZero.{u1, u5} R Pₗ (Semiring.toMonoidWithZero.{u1} R _inst_1) (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (Module.toMulActionWithZero.{u1, u5} R Pₗ _inst_1 _inst_12 _inst_24))))) c (f m n))) -> (forall (m : M) (n₁ : N) (n₂ : N), Eq.{succ u5} Pₗ (f m (HAdd.hAdd.{u4, u4, u4} N N N (instHAdd.{u4} N (AddZeroClass.toAdd.{u4} N (AddMonoid.toAddZeroClass.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6)))) n₁ n₂)) (HAdd.hAdd.{u5, u5, u5} Pₗ Pₗ Pₗ (instHAdd.{u5} Pₗ (AddZeroClass.toAdd.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)))) (f m n₁) (f m n₂))) -> (forall (c : S) (m : M) (n : N), Eq.{succ u5} Pₗ (f m (HSMul.hSMul.{u2, u4, u4} S N N (instHSMul.{u2, u4} S N (SMulZeroClass.toSMul.{u2, u4} S N (AddMonoid.toZero.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6)) (SMulWithZero.toSMulZeroClass.{u2, u4} S N (MonoidWithZero.toZero.{u2} S (Semiring.toMonoidWithZero.{u2} S _inst_2)) (AddMonoid.toZero.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6)) (MulActionWithZero.toSMulWithZero.{u2, u4} S N (Semiring.toMonoidWithZero.{u2} S _inst_2) (AddMonoid.toZero.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6)) (Module.toMulActionWithZero.{u2, u4} S N _inst_2 _inst_6 _inst_17))))) c n)) (HSMul.hSMul.{u2, u5, u5} S Pₗ Pₗ (instHSMul.{u2, u5} S Pₗ (SMulZeroClass.toSMul.{u2, u5} S Pₗ (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (SMulWithZero.toSMulZeroClass.{u2, u5} S Pₗ (MonoidWithZero.toZero.{u2} S (Semiring.toMonoidWithZero.{u2} S _inst_2)) (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (MulActionWithZero.toSMulWithZero.{u2, u5} S Pₗ (Semiring.toMonoidWithZero.{u2} S _inst_2) (AddMonoid.toZero.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)) (Module.toMulActionWithZero.{u2, u5} S Pₗ _inst_2 _inst_12 _inst_25))))) c (f m n))) -> (LinearMap.{u1, u1, u3, max u5 u4} R R _inst_1 _inst_1 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R _inst_1)) M (LinearMap.{u2, u2, u4, u5} S S _inst_2 _inst_2 (RingHom.id.{u2} S (Semiring.toNonAssocSemiring.{u2} S _inst_2)) N Pₗ _inst_6 _inst_12 _inst_17 _inst_25) _inst_5 (LinearMap.addCommMonoid.{u2, u2, u4, u5} S S N Pₗ _inst_2 _inst_2 _inst_6 _inst_12 _inst_17 _inst_25 (RingHom.id.{u2} S (Semiring.toNonAssocSemiring.{u2} S _inst_2))) _inst_16 (LinearMap.instModuleLinearMapAddCommMonoid.{u2, u2, u1, u4, u5} S S R N Pₗ _inst_2 _inst_2 _inst_6 _inst_12 _inst_17 _inst_25 (RingHom.id.{u2} S (Semiring.toNonAssocSemiring.{u2} S _inst_2)) _inst_1 _inst_24 _inst_31))
+Case conversion may be inaccurate. Consider using '#align linear_map.mk₂' LinearMap.mk₂'ₓ'. -/
 /-- Create a bilinear map from a function that is linear in each component.
 See `mk₂` for the special case where both arguments come from modules over the same ring. -/
 def mk₂' (f : M → N → Pₗ) (H1 : ∀ m₁ m₂ n, f (m₁ + m₂) n = f m₁ n + f m₂ n)
@@ -111,16 +129,34 @@ def mk₂' (f : M → N → Pₗ) (H1 : ∀ m₁ m₂ n, f (m₁ + m₂) n = f m
 
 variable {R S}
 
+/- warning: linear_map.mk₂'_apply -> LinearMap.mk₂'_apply is a dubious translation:
+lean 3 declaration is
+  forall {R : Type.{u1}} [_inst_1 : Semiring.{u1} R] {S : Type.{u2}} [_inst_2 : Semiring.{u2} S] {M : Type.{u3}} {N : Type.{u4}} {Pₗ : Type.{u5}} [_inst_5 : AddCommMonoid.{u3} M] [_inst_6 : AddCommMonoid.{u4} N] [_inst_12 : AddCommMonoid.{u5} Pₗ] [_inst_16 : Module.{u1, u3} R M _inst_1 _inst_5] [_inst_17 : Module.{u2, u4} S N _inst_2 _inst_6] [_inst_24 : Module.{u1, u5} R Pₗ _inst_1 _inst_12] [_inst_25 : Module.{u2, u5} S Pₗ _inst_2 _inst_12] [_inst_31 : SMulCommClass.{u2, u1, u5} S R Pₗ (SMulZeroClass.toHasSmul.{u2, u5} S Pₗ (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (SMulWithZero.toSmulZeroClass.{u2, u5} S Pₗ (MulZeroClass.toHasZero.{u2} S (MulZeroOneClass.toMulZeroClass.{u2} S (MonoidWithZero.toMulZeroOneClass.{u2} S (Semiring.toMonoidWithZero.{u2} S _inst_2)))) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (MulActionWithZero.toSMulWithZero.{u2, u5} S Pₗ (Semiring.toMonoidWithZero.{u2} S _inst_2) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (Module.toMulActionWithZero.{u2, u5} S Pₗ _inst_2 _inst_12 _inst_25)))) (SMulZeroClass.toHasSmul.{u1, u5} R Pₗ (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (SMulWithZero.toSmulZeroClass.{u1, u5} R Pₗ (MulZeroClass.toHasZero.{u1} R (MulZeroOneClass.toMulZeroClass.{u1} R (MonoidWithZero.toMulZeroOneClass.{u1} R (Semiring.toMonoidWithZero.{u1} R _inst_1)))) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (MulActionWithZero.toSMulWithZero.{u1, u5} R Pₗ (Semiring.toMonoidWithZero.{u1} R _inst_1) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (Module.toMulActionWithZero.{u1, u5} R Pₗ _inst_1 _inst_12 _inst_24))))] (f : M -> N -> Pₗ) {H1 : forall (m₁ : M) (m₂ : M) (n : N), Eq.{succ u5} Pₗ (f (HAdd.hAdd.{u3, u3, u3} M M M (instHAdd.{u3} M (AddZeroClass.toHasAdd.{u3} M (AddMonoid.toAddZeroClass.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5)))) m₁ m₂) n) (HAdd.hAdd.{u5, u5, u5} Pₗ Pₗ Pₗ (instHAdd.{u5} Pₗ (AddZeroClass.toHasAdd.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)))) (f m₁ n) (f m₂ n))} {H2 : forall (c : R) (m : M) (n : N), Eq.{succ u5} Pₗ (f (SMul.smul.{u1, u3} R M (SMulZeroClass.toHasSmul.{u1, u3} R M (AddZeroClass.toHasZero.{u3} M (AddMonoid.toAddZeroClass.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5))) (SMulWithZero.toSmulZeroClass.{u1, u3} R M (MulZeroClass.toHasZero.{u1} R (MulZeroOneClass.toMulZeroClass.{u1} R (MonoidWithZero.toMulZeroOneClass.{u1} R (Semiring.toMonoidWithZero.{u1} R _inst_1)))) (AddZeroClass.toHasZero.{u3} M (AddMonoid.toAddZeroClass.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5))) (MulActionWithZero.toSMulWithZero.{u1, u3} R M (Semiring.toMonoidWithZero.{u1} R _inst_1) (AddZeroClass.toHasZero.{u3} M (AddMonoid.toAddZeroClass.{u3} M (AddCommMonoid.toAddMonoid.{u3} M _inst_5))) (Module.toMulActionWithZero.{u1, u3} R M _inst_1 _inst_5 _inst_16)))) c m) n) (SMul.smul.{u1, u5} R Pₗ (SMulZeroClass.toHasSmul.{u1, u5} R Pₗ (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (SMulWithZero.toSmulZeroClass.{u1, u5} R Pₗ (MulZeroClass.toHasZero.{u1} R (MulZeroOneClass.toMulZeroClass.{u1} R (MonoidWithZero.toMulZeroOneClass.{u1} R (Semiring.toMonoidWithZero.{u1} R _inst_1)))) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (MulActionWithZero.toSMulWithZero.{u1, u5} R Pₗ (Semiring.toMonoidWithZero.{u1} R _inst_1) (AddZeroClass.toHasZero.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12))) (Module.toMulActionWithZero.{u1, u5} R Pₗ _inst_1 _inst_12 _inst_24)))) c (f m n))} {H3 : forall (m : M) (n₁ : N) (n₂ : N), Eq.{succ u5} Pₗ (f m (HAdd.hAdd.{u4, u4, u4} N N N (instHAdd.{u4} N (AddZeroClass.toHasAdd.{u4} N (AddMonoid.toAddZeroClass.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6)))) n₁ n₂)) (HAdd.hAdd.{u5, u5, u5} Pₗ Pₗ Pₗ (instHAdd.{u5} Pₗ (AddZeroClass.toHasAdd.{u5} Pₗ (AddMonoid.toAddZeroClass.{u5} Pₗ (AddCommMonoid.toAddMonoid.{u5} Pₗ _inst_12)))) (f m n₁) (f m n₂))} {H4 : forall (c : S) (m : M) (n : N), Eq.{succ u5} Pₗ (f m (SMul.smul.{u2, u4} S N (SMulZeroClass.toHasSmul.{u2, u4} S N (AddZeroClass.toHasZero.{u4} N (AddMonoid.toAddZeroClass.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6))) (SMulWithZero.toSmulZeroClass.{u2, u4} S N (MulZeroClass.toHasZero.{u2} S (MulZeroOneClass.toMulZeroClass.{u2} S (MonoidWithZero.toMulZeroOneClass.{u2} S (Semiring.toMonoidWithZero.{u2} S _inst_2)))) (AddZeroClass.toHasZero.{u4} N (AddMonoid.toAddZeroClass.{u4} N (AddCommMonoid.toAddMonoid.{u4} N _inst_6))) (MulActionWithZero.toSMulWithZero.{u2, u4} 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+but is expected to have type
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+Case conversion may be inaccurate. Consider using '#align linear_map.mk₂'_apply LinearMap.mk₂'_applyₓ'. -/
 @[simp]
 theorem mk₂'_apply (f : M → N → Pₗ) {H1 H2 H3 H4} (m : M) (n : N) :
     (mk₂' R S f H1 H2 H3 H4 : M →ₗ[R] N →ₗ[S] Pₗ) m n = f m n :=
   rfl
 #align linear_map.mk₂'_apply LinearMap.mk₂'_apply
 
+/- warning: linear_map.ext₂ -> LinearMap.ext₂ is a dubious translation:
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+Case conversion may be inaccurate. Consider using '#align linear_map.ext₂ LinearMap.ext₂ₓ'. -/
 theorem ext₂ {f g : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P} (H : ∀ m n, f m n = g m n) : f = g :=
   LinearMap.ext fun m => LinearMap.ext fun n => H m n
 #align linear_map.ext₂ LinearMap.ext₂
 
+/- warning: linear_map.congr_fun₂ -> LinearMap.congr_fun₂ is a dubious translation:
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(AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (MulActionWithZero.toSMulWithZero.{u4, u7} S₂ P (Semiring.toMonoidWithZero.{u4} S₂ _inst_4) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (Module.toMulActionWithZero.{u4, u7} S₂ P _inst_4 _inst_7 _inst_19)))) (SMulZeroClass.toHasSmul.{u3, u7} R₂ P (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (SMulWithZero.toSmulZeroClass.{u3, u7} R₂ P (MulZeroClass.toHasZero.{u3} R₂ (MulZeroOneClass.toMulZeroClass.{u3} R₂ (MonoidWithZero.toMulZeroOneClass.{u3} R₂ (Semiring.toMonoidWithZero.{u3} R₂ _inst_3)))) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (MulActionWithZero.toSMulWithZero.{u3, u7} R₂ P (Semiring.toMonoidWithZero.{u3} R₂ _inst_3) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) 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+but is expected to have type
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+Case conversion may be inaccurate. Consider using '#align linear_map.congr_fun₂ LinearMap.congr_fun₂ₓ'. -/
 theorem congr_fun₂ {f g : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P} (h : f = g) (x y) : f x y = g x y :=
   LinearMap.congr_fun (LinearMap.congr_fun h x) y
 #align linear_map.congr_fun₂ LinearMap.congr_fun₂
@@ -129,6 +165,7 @@ section
 
 attribute [local instance] SMulCommClass.symm
 
+#print LinearMap.flip /-
 /-- Given a linear map from `M` to linear maps from `N` to `P`, i.e., a bilinear map from `M × N` to
 `P`, change the order of variables and get a linear map from `N` to linear maps from `M` to `P`. -/
 def flip (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) : N →ₛₗ[σ₁₂] M →ₛₗ[ρ₁₂] P :=
@@ -136,14 +173,27 @@ def flip (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) : N →ₛₗ[σ₁
     (fun c n m => (f m).map_smulₛₗ _ _) (fun n m₁ m₂ => by rw [f.map_add] <;> rfl) fun c n m => by
     rw [f.map_smulₛₗ] <;> rfl
 #align linear_map.flip LinearMap.flip
+-/
 
 end
 
+/- warning: linear_map.flip_apply -> LinearMap.flip_apply is a dubious translation:
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+Case conversion may be inaccurate. Consider using '#align linear_map.flip_apply LinearMap.flip_applyₓ'. -/
 @[simp]
 theorem flip_apply (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) (m : M) (n : N) : flip f n m = f m n :=
   rfl
 #align linear_map.flip_apply LinearMap.flip_apply
 
+/- warning: linear_map.flip_flip -> LinearMap.flip_flip is a dubious translation:
+lean 3 declaration is
+  forall {R : Type.{u1}} [_inst_1 : Semiring.{u1} R] {S : Type.{u2}} [_inst_2 : Semiring.{u2} S] {R₂ : Type.{u3}} [_inst_3 : Semiring.{u3} R₂] {S₂ : Type.{u4}} [_inst_4 : Semiring.{u4} S₂] {M : Type.{u5}} {N : Type.{u6}} {P : Type.{u7}} [_inst_5 : AddCommMonoid.{u5} M] [_inst_6 : AddCommMonoid.{u6} N] [_inst_7 : AddCommMonoid.{u7} P] [_inst_16 : Module.{u1, u5} R M _inst_1 _inst_5] [_inst_17 : Module.{u2, u6} S N _inst_2 _inst_6] [_inst_18 : Module.{u3, u7} R₂ P _inst_3 _inst_7] [_inst_19 : Module.{u4, u7} S₂ P _inst_4 _inst_7] [_inst_30 : SMulCommClass.{u4, u3, u7} S₂ R₂ P (SMulZeroClass.toHasSmul.{u4, u7} S₂ P (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (SMulWithZero.toSmulZeroClass.{u4, u7} S₂ P (MulZeroClass.toHasZero.{u4} S₂ (MulZeroOneClass.toMulZeroClass.{u4} S₂ (MonoidWithZero.toMulZeroOneClass.{u4} S₂ (Semiring.toMonoidWithZero.{u4} S₂ _inst_4)))) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (MulActionWithZero.toSMulWithZero.{u4, u7} S₂ P (Semiring.toMonoidWithZero.{u4} S₂ _inst_4) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (Module.toMulActionWithZero.{u4, u7} S₂ P _inst_4 _inst_7 _inst_19)))) (SMulZeroClass.toHasSmul.{u3, u7} R₂ P (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (SMulWithZero.toSmulZeroClass.{u3, u7} R₂ P (MulZeroClass.toHasZero.{u3} R₂ (MulZeroOneClass.toMulZeroClass.{u3} R₂ (MonoidWithZero.toMulZeroOneClass.{u3} R₂ (Semiring.toMonoidWithZero.{u3} R₂ _inst_3)))) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (MulActionWithZero.toSMulWithZero.{u3, u7} R₂ P (Semiring.toMonoidWithZero.{u3} R₂ _inst_3) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (Module.toMulActionWithZero.{u3, u7} R₂ P _inst_3 _inst_7 _inst_18))))] {ρ₁₂ : RingHom.{u1, u3} R R₂ (Semiring.toNonAssocSemiring.{u1} R _inst_1) (Semiring.toNonAssocSemiring.{u3} R₂ _inst_3)} {σ₁₂ : RingHom.{u2, u4} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u4} S₂ _inst_4)} [_inst_34 : SMulCommClass.{u3, u4, u7} R₂ S₂ P (SMulZeroClass.toHasSmul.{u3, u7} R₂ P (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (SMulWithZero.toSmulZeroClass.{u3, u7} R₂ P (MulZeroClass.toHasZero.{u3} R₂ (MulZeroOneClass.toMulZeroClass.{u3} R₂ (MonoidWithZero.toMulZeroOneClass.{u3} R₂ (Semiring.toMonoidWithZero.{u3} R₂ _inst_3)))) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (MulActionWithZero.toSMulWithZero.{u3, u7} R₂ P (Semiring.toMonoidWithZero.{u3} R₂ _inst_3) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (Module.toMulActionWithZero.{u3, u7} R₂ P _inst_3 _inst_7 _inst_18)))) (SMulZeroClass.toHasSmul.{u4, u7} S₂ P (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (SMulWithZero.toSmulZeroClass.{u4, u7} S₂ P (MulZeroClass.toHasZero.{u4} S₂ (MulZeroOneClass.toMulZeroClass.{u4} S₂ (MonoidWithZero.toMulZeroOneClass.{u4} S₂ (Semiring.toMonoidWithZero.{u4} S₂ _inst_4)))) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (MulActionWithZero.toSMulWithZero.{u4, u7} S₂ P (Semiring.toMonoidWithZero.{u4} S₂ _inst_4) (AddZeroClass.toHasZero.{u7} P (AddMonoid.toAddZeroClass.{u7} P (AddCommMonoid.toAddMonoid.{u7} P _inst_7))) (Module.toMulActionWithZero.{u4, u7} S₂ P _inst_4 _inst_7 _inst_19))))] (f : LinearMap.{u1, u3, u5, max u6 u7} R R₂ _inst_1 _inst_3 ρ₁₂ M (LinearMap.{u2, u4, u6, u7} S S₂ _inst_2 _inst_4 σ₁₂ N P _inst_6 _inst_7 _inst_17 _inst_19) _inst_5 (LinearMap.addCommMonoid.{u2, u4, u6, u7} S S₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂) _inst_16 (LinearMap.module.{u2, u4, u3, u6, u7} S S₂ R₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂ _inst_3 _inst_18 _inst_30)), Eq.{max (succ u5) (succ (max u6 u7))} (LinearMap.{u1, u3, u5, max u6 u7} R R₂ _inst_1 _inst_3 ρ₁₂ M (LinearMap.{u2, u4, u6, u7} S S₂ _inst_2 _inst_4 σ₁₂ N P _inst_6 _inst_7 _inst_17 _inst_19) _inst_5 (LinearMap.addCommMonoid.{u2, u4, u6, u7} S S₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂) _inst_16 (LinearMap.module.{u2, u4, u3, u6, u7} S S₂ R₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂ _inst_3 _inst_18 (LinearMap.flip._proof_1.{u4, u3, u7} S₂ _inst_4 R₂ _inst_3 P _inst_7 _inst_19 _inst_18 _inst_34))) (LinearMap.flip.{u2, u1, u4, u3, u6, u5, u7} S _inst_2 R _inst_1 S₂ _inst_4 R₂ _inst_3 N M P _inst_6 _inst_5 _inst_7 _inst_17 _inst_16 _inst_19 _inst_18 _inst_34 σ₁₂ ρ₁₂ (LinearMap.flip.{u1, u2, u3, u4, u5, u6, u7} R _inst_1 S _inst_2 R₂ _inst_3 S₂ _inst_4 M N P _inst_5 _inst_6 _inst_7 _inst_16 _inst_17 _inst_18 _inst_19 _inst_30 ρ₁₂ σ₁₂ f)) f
+but is expected to have type
+  forall {R : Type.{u7}} [_inst_1 : Semiring.{u7} R] {S : Type.{u2}} [_inst_2 : Semiring.{u2} S] {R₂ : Type.{u6}} [_inst_3 : Semiring.{u6} R₂] {S₂ : Type.{u1}} [_inst_4 : Semiring.{u1} S₂] {M : Type.{u5}} {N : Type.{u3}} {P : Type.{u4}} [_inst_5 : AddCommMonoid.{u5} M] [_inst_6 : AddCommMonoid.{u3} N] [_inst_7 : AddCommMonoid.{u4} P] [_inst_16 : Module.{u7, u5} R M _inst_1 _inst_5] [_inst_17 : Module.{u2, u3} S N _inst_2 _inst_6] [_inst_18 : Module.{u6, u4} R₂ P _inst_3 _inst_7] [_inst_19 : Module.{u1, u4} S₂ P _inst_4 _inst_7] [_inst_30 : SMulCommClass.{u1, u6, u4} S₂ R₂ P (SMulZeroClass.toSMul.{u1, u4} S₂ P (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u1, u4} S₂ P (MonoidWithZero.toZero.{u1} S₂ (Semiring.toMonoidWithZero.{u1} S₂ _inst_4)) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u1, u4} S₂ P (Semiring.toMonoidWithZero.{u1} S₂ _inst_4) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (Module.toMulActionWithZero.{u1, u4} S₂ P _inst_4 _inst_7 _inst_19)))) (SMulZeroClass.toSMul.{u6, u4} R₂ P (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u6, u4} R₂ P (MonoidWithZero.toZero.{u6} R₂ (Semiring.toMonoidWithZero.{u6} R₂ _inst_3)) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u6, u4} R₂ P (Semiring.toMonoidWithZero.{u6} R₂ _inst_3) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (Module.toMulActionWithZero.{u6, u4} R₂ P _inst_3 _inst_7 _inst_18))))] {ρ₁₂ : RingHom.{u7, u6} R R₂ (Semiring.toNonAssocSemiring.{u7} R _inst_1) (Semiring.toNonAssocSemiring.{u6} R₂ _inst_3)} {σ₁₂ : RingHom.{u2, u1} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u1} S₂ _inst_4)} (_inst_34 : LinearMap.{u7, u6, u5, max u4 u3} R R₂ _inst_1 _inst_3 ρ₁₂ M (LinearMap.{u2, u1, u3, u4} S S₂ _inst_2 _inst_4 σ₁₂ N P _inst_6 _inst_7 _inst_17 _inst_19) _inst_5 (LinearMap.addCommMonoid.{u2, u1, u3, u4} S S₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂) _inst_16 (LinearMap.instModuleLinearMapAddCommMonoid.{u2, u1, u6, u3, u4} S S₂ R₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂ _inst_3 _inst_18 _inst_30)), Eq.{max (max (succ u5) (succ u3)) (succ u4)} (LinearMap.{u7, u6, u5, max u4 u3} R R₂ _inst_1 _inst_3 ρ₁₂ M (LinearMap.{u2, u1, u3, u4} S S₂ _inst_2 _inst_4 σ₁₂ N P _inst_6 _inst_7 _inst_17 _inst_19) _inst_5 (LinearMap.addCommMonoid.{u2, u1, u3, u4} S S₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂) _inst_16 (LinearMap.instModuleLinearMapAddCommMonoid.{u2, u1, u6, u3, u4} S S₂ R₂ N P _inst_2 _inst_4 _inst_6 _inst_7 _inst_17 _inst_19 σ₁₂ _inst_3 _inst_18 (SMulCommClass.symm.{u4, u1, u6} R₂ S₂ P (SMulZeroClass.toSMul.{u6, u4} R₂ P (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u6, u4} R₂ P (MonoidWithZero.toZero.{u6} R₂ (Semiring.toMonoidWithZero.{u6} R₂ _inst_3)) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u6, u4} R₂ P (Semiring.toMonoidWithZero.{u6} R₂ _inst_3) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (Module.toMulActionWithZero.{u6, u4} R₂ P _inst_3 _inst_7 _inst_18)))) (SMulZeroClass.toSMul.{u1, u4} S₂ P (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u1, u4} S₂ P (MonoidWithZero.toZero.{u1} S₂ (Semiring.toMonoidWithZero.{u1} S₂ _inst_4)) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u1, u4} S₂ P (Semiring.toMonoidWithZero.{u1} S₂ _inst_4) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (Module.toMulActionWithZero.{u1, u4} S₂ P _inst_4 _inst_7 _inst_19)))) (SMulCommClass.symm.{u4, u6, u1} S₂ R₂ P (SMulZeroClass.toSMul.{u1, u4} S₂ P (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u1, u4} S₂ P (MonoidWithZero.toZero.{u1} S₂ (Semiring.toMonoidWithZero.{u1} S₂ _inst_4)) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u1, u4} S₂ P (Semiring.toMonoidWithZero.{u1} S₂ _inst_4) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (Module.toMulActionWithZero.{u1, u4} S₂ P _inst_4 _inst_7 _inst_19)))) (SMulZeroClass.toSMul.{u6, u4} R₂ P (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u6, u4} R₂ P (MonoidWithZero.toZero.{u6} R₂ (Semiring.toMonoidWithZero.{u6} R₂ _inst_3)) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u6, u4} R₂ P (Semiring.toMonoidWithZero.{u6} R₂ _inst_3) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (Module.toMulActionWithZero.{u6, u4} R₂ P _inst_3 _inst_7 _inst_18)))) _inst_30)))) (LinearMap.flip.{u2, u7, u1, u6, u3, u5, u4} S _inst_2 R _inst_1 S₂ _inst_4 R₂ _inst_3 N M P _inst_6 _inst_5 _inst_7 _inst_17 _inst_16 _inst_19 _inst_18 (SMulCommClass.symm.{u4, u6, u1} S₂ R₂ P (SMulZeroClass.toSMul.{u1, u4} S₂ P (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u1, u4} S₂ P (MonoidWithZero.toZero.{u1} S₂ (Semiring.toMonoidWithZero.{u1} S₂ _inst_4)) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u1, u4} S₂ P (Semiring.toMonoidWithZero.{u1} S₂ _inst_4) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (Module.toMulActionWithZero.{u1, u4} S₂ P _inst_4 _inst_7 _inst_19)))) (SMulZeroClass.toSMul.{u6, u4} R₂ P (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (SMulWithZero.toSMulZeroClass.{u6, u4} R₂ P (MonoidWithZero.toZero.{u6} R₂ (Semiring.toMonoidWithZero.{u6} R₂ _inst_3)) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (MulActionWithZero.toSMulWithZero.{u6, u4} R₂ P (Semiring.toMonoidWithZero.{u6} R₂ _inst_3) (AddMonoid.toZero.{u4} P (AddCommMonoid.toAddMonoid.{u4} P _inst_7)) (Module.toMulActionWithZero.{u6, u4} R₂ P _inst_3 _inst_7 _inst_18)))) _inst_30) σ₁₂ ρ₁₂ (LinearMap.flip.{u7, u2, u6, u1, u5, u3, u4} R _inst_1 S _inst_2 R₂ _inst_3 S₂ _inst_4 M N P _inst_5 _inst_6 _inst_7 _inst_16 _inst_17 _inst_18 _inst_19 _inst_30 ρ₁₂ σ₁₂ _inst_34)) _inst_34
+Case conversion may be inaccurate. Consider using '#align linear_map.flip_flip LinearMap.flip_flipₓ'. -/
 @[simp]
 theorem flip_flip [SMulCommClass R₂ S₂ P] (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) : f.flip.flip = f :=
   LinearMap.ext₂ fun x y => (f.flip.flip_apply _ _).trans (f.flip_apply _ _)
@@ -153,39 +203,88 @@ open BigOperators
 
 variable {R}
 
+/- warning: linear_map.flip_inj -> LinearMap.flip_inj is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align linear_map.flip_inj LinearMap.flip_injₓ'. -/
 theorem flip_inj {f g : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P} (H : flip f = flip g) : f = g :=
   ext₂ fun m n => show flip f n m = flip g n m by rw [H]
 #align linear_map.flip_inj LinearMap.flip_inj
 
+/- warning: linear_map.map_zero₂ -> LinearMap.map_zero₂ is a dubious translation:
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+Case conversion may be inaccurate. Consider using '#align linear_map.map_zero₂ LinearMap.map_zero₂ₓ'. -/
 theorem map_zero₂ (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) (y) : f 0 y = 0 :=
   (flip f y).map_zero
 #align linear_map.map_zero₂ LinearMap.map_zero₂
 
+/- warning: linear_map.map_neg₂ -> LinearMap.map_neg₂ is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align linear_map.map_neg₂ LinearMap.map_neg₂ₓ'. -/
 theorem map_neg₂ (f : M' →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P') (x y) : f (-x) y = -f x y :=
   (flip f y).map_neg _
 #align linear_map.map_neg₂ LinearMap.map_neg₂
 
+/- warning: linear_map.map_sub₂ -> LinearMap.map_sub₂ is a dubious translation:
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+but is expected to have type
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+Case conversion may be inaccurate. Consider using '#align linear_map.map_sub₂ LinearMap.map_sub₂ₓ'. -/
 theorem map_sub₂ (f : M' →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P') (x y z) : f (x - y) z = f x z - f y z :=
   (flip f z).map_sub _ _
 #align linear_map.map_sub₂ LinearMap.map_sub₂
 
+/- warning: linear_map.map_add₂ -> LinearMap.map_add₂ is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align linear_map.map_add₂ LinearMap.map_add₂ₓ'. -/
 theorem map_add₂ (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) (x₁ x₂ y) : f (x₁ + x₂) y = f x₁ y + f x₂ y :=
   (flip f y).map_add _ _
 #align linear_map.map_add₂ LinearMap.map_add₂
 
+/- warning: linear_map.map_smul₂ -> LinearMap.map_smul₂ is a dubious translation:
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(Module.toMulActionWithZero.{u1, u6} R P₂ _inst_1 _inst_10 _inst_22))))] {σ₁₂ : RingHom.{u2, u3} S S₂ (Semiring.toNonAssocSemiring.{u2} S _inst_2) (Semiring.toNonAssocSemiring.{u3} S₂ _inst_4)} (f : LinearMap.{u1, u1, u4, max u5 u6} R R _inst_1 _inst_1 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R _inst_1)) M₂ (LinearMap.{u2, u3, u5, u6} S S₂ _inst_2 _inst_4 σ₁₂ N₂ P₂ _inst_9 _inst_10 _inst_21 _inst_23) _inst_8 (LinearMap.addCommMonoid.{u2, u3, u5, u6} S S₂ N₂ P₂ _inst_2 _inst_4 _inst_9 _inst_10 _inst_21 _inst_23 σ₁₂) _inst_20 (LinearMap.module.{u2, u3, u1, u5, u6} S S₂ R N₂ P₂ _inst_2 _inst_4 _inst_9 _inst_10 _inst_21 _inst_23 σ₁₂ _inst_1 _inst_22 _inst_33)) (r : R) (x : M₂) (y : N₂), Eq.{succ u6} P₂ (coeFn.{max (succ u5) (succ u6), max (succ u5) (succ u6)} (LinearMap.{u2, u3, u5, u6} S S₂ _inst_2 _inst_4 σ₁₂ N₂ P₂ _inst_9 _inst_10 _inst_21 _inst_23) (fun (_x : LinearMap.{u2, u3, u5, u6} S S₂ _inst_2 _inst_4 σ₁₂ N₂ P₂ _inst_9 _inst_10 _inst_21 _inst_23) => N₂ -> P₂) 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+but is expected to have type
+  forall {R : Type.{u6}} [_inst_1 : Semiring.{u6} R] {S : Type.{u2}} [_inst_2 : Semiring.{u2} S] {S₂ : Type.{u1}} [_inst_4 : Semiring.{u1} S₂] {M₂ : Type.{u5}} {N₂ : Type.{u3}} {P₂ : Type.{u4}} [_inst_8 : AddCommMonoid.{u5} M₂] [_inst_9 : AddCommMonoid.{u3} N₂] [_inst_10 : AddCommMonoid.{u4} P₂] [_inst_20 : Module.{u6, u5} R M₂ _inst_1 _inst_8] [_inst_21 : Module.{u2, u3} S N₂ _inst_2 _inst_9] [_inst_22 : Module.{u6, u4} R P₂ _inst_1 _inst_10] [_inst_23 : Module.{u1, u4} S₂ P₂ _inst_4 _inst_10] [_inst_33 : SMulCommClass.{u1, u6, u4} S₂ R P₂ (SMulZeroClass.toSMul.{u1, u4} S₂ P₂ (AddMonoid.toZero.{u4} P₂ (AddCommMonoid.toAddMonoid.{u4} P₂ _inst_10)) (SMulWithZero.toSMulZeroClass.{u1, u4} S₂ P₂ (MonoidWithZero.toZero.{u1} S₂ (Semiring.toMonoidWithZero.{u1} S₂ _inst_4)) (AddMonoid.toZero.{u4} P₂ (AddCommMonoid.toAddMonoid.{u4} P₂ _inst_10)) (MulActionWithZero.toSMulWithZero.{u1, u4} S₂ P₂ (Semiring.toMonoidWithZero.{u1} S₂ _inst_4) (AddMonoid.toZero.{u4} P₂ (AddCommMonoid.toAddMonoid.{u4} 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+Case conversion may be inaccurate. Consider using '#align linear_map.map_smul₂ LinearMap.map_smul₂ₓ'. -/
 theorem map_smul₂ (f : M₂ →ₗ[R] N₂ →ₛₗ[σ₁₂] P₂) (r : R) (x y) : f (r • x) y = r • f x y :=
   (flip f y).map_smul _ _
 #align linear_map.map_smul₂ LinearMap.map_smul₂
 
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+Case conversion may be inaccurate. Consider using '#align linear_map.map_smulₛₗ₂ LinearMap.map_smulₛₗ₂ₓ'. -/
 theorem map_smulₛₗ₂ (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) (r : R) (x y) : f (r • x) y = ρ₁₂ r • f x y :=
   (flip f y).map_smulₛₗ _ _
 #align linear_map.map_smulₛₗ₂ LinearMap.map_smulₛₗ₂
 
+/- warning: linear_map.map_sum₂ -> LinearMap.map_sum₂ is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align linear_map.map_sum₂ LinearMap.map_sum₂ₓ'. -/
 theorem map_sum₂ {ι : Type _} (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) (t : Finset ι) (x : ι → M) (y) :
     f (∑ i in t, x i) y = ∑ i in t, f (x i) y :=
   (flip f y).map_sum
 #align linear_map.map_sum₂ LinearMap.map_sum₂
 
+#print LinearMap.domRestrict₂ /-
 /-- Restricting a bilinear map in the second entry -/
 def domRestrict₂ (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) (q : Submodule S N) : M →ₛₗ[ρ₁₂] q →ₛₗ[σ₁₂] P
     where
@@ -194,18 +293,33 @@ def domRestrict₂ (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) (q : Subm
   map_smul' c m :=
     LinearMap.ext fun _ => by simp only [f.map_smulₛₗ, dom_restrict_apply, smul_apply]
 #align linear_map.dom_restrict₂ LinearMap.domRestrict₂
+-/
 
+/- warning: linear_map.dom_restrict₂_apply -> LinearMap.domRestrict₂_apply is a dubious translation:
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+Case conversion may be inaccurate. Consider using '#align linear_map.dom_restrict₂_apply LinearMap.domRestrict₂_applyₓ'. -/
 theorem domRestrict₂_apply (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) (q : Submodule S N) (x : M) (y : q) :
     f.domRestrict₂ q x y = f x y :=
   rfl
 #align linear_map.dom_restrict₂_apply LinearMap.domRestrict₂_apply
 
+#print LinearMap.domRestrict₁₂ /-
 /-- Restricting a bilinear map in both components -/
 def domRestrict₁₂ (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) (p : Submodule R M) (q : Submodule S N) :
     p →ₛₗ[ρ₁₂] q →ₛₗ[σ₁₂] P :=
   (f.domRestrict p).domRestrict₂ q
 #align linear_map.dom_restrict₁₂ LinearMap.domRestrict₁₂
+-/
 
+/- warning: linear_map.dom_restrict₁₂_apply -> LinearMap.domRestrict₁₂_apply is a dubious translation:
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+Case conversion may be inaccurate. Consider using '#align linear_map.dom_restrict₁₂_apply LinearMap.domRestrict₁₂_applyₓ'. -/
 theorem domRestrict₁₂_apply (f : M →ₛₗ[ρ₁₂] N →ₛₗ[σ₁₂] P) (p : Submodule R M) (q : Submodule S N)
     (x : p) (y : q) : f.domRestrict₁₂ p q x y = f x y :=
   rfl
@@ -241,6 +355,12 @@ variable [RingHomCompTriple σ₁₂ σ₂₃ σ₁₃] [RingHomCompTriple σ₄
 
 variable (R)
 
+/- warning: linear_map.mk₂ -> LinearMap.mk₂ is a dubious translation:
+lean 3 declaration is
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(CommSemiring.toSemiring.{u1} R _inst_1) _inst_10 _inst_19)))) c n)) (SMul.smul.{u1, u4} R Pₗ (SMulZeroClass.toHasSmul.{u1, u4} R Pₗ (AddZeroClass.toHasZero.{u4} Pₗ (AddMonoid.toAddZeroClass.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11))) (SMulWithZero.toSmulZeroClass.{u1, u4} R Pₗ (MulZeroClass.toHasZero.{u1} R (MulZeroOneClass.toMulZeroClass.{u1} R (MonoidWithZero.toMulZeroOneClass.{u1} R (Semiring.toMonoidWithZero.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))))) (AddZeroClass.toHasZero.{u4} Pₗ (AddMonoid.toAddZeroClass.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11))) (MulActionWithZero.toSMulWithZero.{u1, u4} R Pₗ (Semiring.toMonoidWithZero.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (AddZeroClass.toHasZero.{u4} Pₗ (AddMonoid.toAddZeroClass.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11))) (Module.toMulActionWithZero.{u1, u4} R Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_11 _inst_20)))) c (f m n))) -> (LinearMap.{u1, u1, u2, max u3 u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) M (LinearMap.{u1, u1, u3, u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) Nₗ Pₗ _inst_10 _inst_11 _inst_19 _inst_20) _inst_5 (LinearMap.addCommMonoid.{u1, u1, u3, u4} R R Nₗ Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10 _inst_11 _inst_19 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)))) _inst_14 (LinearMap.module.{u1, u1, u1, u3, u4} R R R Nₗ Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10 _inst_11 _inst_19 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_20 (LinearMap.mk₂._proof_1.{u1, u4} R _inst_1 Pₗ _inst_11 _inst_20)))
+but is expected to have type
+  forall (R : Type.{u1}) [_inst_1 : CommSemiring.{u1} R] {M : Type.{u2}} {Nₗ : Type.{u3}} {Pₗ : Type.{u4}} [_inst_5 : AddCommMonoid.{u2} M] [_inst_10 : AddCommMonoid.{u3} Nₗ] [_inst_11 : AddCommMonoid.{u4} Pₗ] [_inst_14 : Module.{u1, u2} R M (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5] [_inst_19 : Module.{u1, u3} R Nₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10] [_inst_20 : Module.{u1, u4} R Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_11] (f : M -> Nₗ -> Pₗ), (forall (m₁ : M) (m₂ : M) (n : Nₗ), Eq.{succ u4} Pₗ (f (HAdd.hAdd.{u2, u2, u2} M M M (instHAdd.{u2} M (AddZeroClass.toAdd.{u2} M (AddMonoid.toAddZeroClass.{u2} M (AddCommMonoid.toAddMonoid.{u2} M _inst_5)))) m₁ m₂) n) (HAdd.hAdd.{u4, u4, u4} Pₗ Pₗ Pₗ (instHAdd.{u4} Pₗ (AddZeroClass.toAdd.{u4} Pₗ (AddMonoid.toAddZeroClass.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11)))) (f m₁ n) (f m₂ n))) -> (forall (c : R) (m : M) (n : Nₗ), Eq.{succ u4} Pₗ (f (HSMul.hSMul.{u1, u2, u2} R M M (instHSMul.{u1, u2} R M (SMulZeroClass.toSMul.{u1, u2} R M (AddMonoid.toZero.{u2} M (AddCommMonoid.toAddMonoid.{u2} M _inst_5)) (SMulWithZero.toSMulZeroClass.{u1, u2} R M (CommMonoidWithZero.toZero.{u1} R (CommSemiring.toCommMonoidWithZero.{u1} R _inst_1)) (AddMonoid.toZero.{u2} M (AddCommMonoid.toAddMonoid.{u2} M _inst_5)) (MulActionWithZero.toSMulWithZero.{u1, u2} R M (Semiring.toMonoidWithZero.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (AddMonoid.toZero.{u2} M (AddCommMonoid.toAddMonoid.{u2} M _inst_5)) (Module.toMulActionWithZero.{u1, u2} R M (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_14))))) c m) n) (HSMul.hSMul.{u1, u4, u4} R Pₗ Pₗ (instHSMul.{u1, u4} R Pₗ (SMulZeroClass.toSMul.{u1, u4} R Pₗ (AddMonoid.toZero.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11)) (SMulWithZero.toSMulZeroClass.{u1, u4} R Pₗ (CommMonoidWithZero.toZero.{u1} R (CommSemiring.toCommMonoidWithZero.{u1} R _inst_1)) (AddMonoid.toZero.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11)) (MulActionWithZero.toSMulWithZero.{u1, u4} R Pₗ (Semiring.toMonoidWithZero.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (AddMonoid.toZero.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11)) (Module.toMulActionWithZero.{u1, u4} R Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_11 _inst_20))))) c (f m n))) -> (forall (m : M) (n₁ : Nₗ) (n₂ : Nₗ), Eq.{succ u4} Pₗ (f m (HAdd.hAdd.{u3, u3, u3} Nₗ Nₗ Nₗ (instHAdd.{u3} Nₗ (AddZeroClass.toAdd.{u3} Nₗ (AddMonoid.toAddZeroClass.{u3} Nₗ (AddCommMonoid.toAddMonoid.{u3} Nₗ _inst_10)))) n₁ n₂)) (HAdd.hAdd.{u4, u4, u4} Pₗ Pₗ Pₗ (instHAdd.{u4} Pₗ (AddZeroClass.toAdd.{u4} Pₗ (AddMonoid.toAddZeroClass.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11)))) (f m n₁) (f m n₂))) -> (forall (c : R) (m : M) (n : Nₗ), Eq.{succ u4} Pₗ (f m (HSMul.hSMul.{u1, u3, u3} R Nₗ Nₗ (instHSMul.{u1, u3} R Nₗ (SMulZeroClass.toSMul.{u1, u3} R Nₗ (AddMonoid.toZero.{u3} Nₗ (AddCommMonoid.toAddMonoid.{u3} Nₗ _inst_10)) (SMulWithZero.toSMulZeroClass.{u1, u3} R Nₗ (CommMonoidWithZero.toZero.{u1} R (CommSemiring.toCommMonoidWithZero.{u1} R _inst_1)) (AddMonoid.toZero.{u3} Nₗ (AddCommMonoid.toAddMonoid.{u3} Nₗ _inst_10)) (MulActionWithZero.toSMulWithZero.{u1, u3} R Nₗ (Semiring.toMonoidWithZero.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (AddMonoid.toZero.{u3} Nₗ (AddCommMonoid.toAddMonoid.{u3} Nₗ _inst_10)) (Module.toMulActionWithZero.{u1, u3} R Nₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10 _inst_19))))) c n)) (HSMul.hSMul.{u1, u4, u4} R Pₗ Pₗ (instHSMul.{u1, u4} R Pₗ (SMulZeroClass.toSMul.{u1, u4} R Pₗ (AddMonoid.toZero.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11)) (SMulWithZero.toSMulZeroClass.{u1, u4} R Pₗ (CommMonoidWithZero.toZero.{u1} R (CommSemiring.toCommMonoidWithZero.{u1} R _inst_1)) (AddMonoid.toZero.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11)) (MulActionWithZero.toSMulWithZero.{u1, u4} R Pₗ (Semiring.toMonoidWithZero.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (AddMonoid.toZero.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11)) (Module.toMulActionWithZero.{u1, u4} R Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_11 _inst_20))))) c (f m n))) -> (LinearMap.{u1, u1, u2, max u4 u3} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) M (LinearMap.{u1, u1, u3, u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) Nₗ Pₗ _inst_10 _inst_11 _inst_19 _inst_20) _inst_5 (LinearMap.addCommMonoid.{u1, u1, u3, u4} R R Nₗ Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10 _inst_11 _inst_19 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)))) _inst_14 (LinearMap.instModuleLinearMapAddCommMonoid.{u1, u1, u1, u3, u4} R R R Nₗ Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10 _inst_11 _inst_19 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_20 (smulCommClass_self.{u1, u4} R Pₗ (CommSemiring.toCommMonoid.{u1} R _inst_1) (MulActionWithZero.toMulAction.{u1, u4} R Pₗ (Semiring.toMonoidWithZero.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (AddMonoid.toZero.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11)) (Module.toMulActionWithZero.{u1, u4} R Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_11 _inst_20)))))
+Case conversion may be inaccurate. Consider using '#align linear_map.mk₂ LinearMap.mk₂ₓ'. -/
 /-- Create a bilinear map from a function that is linear in each component.
 
 This is a shorthand for `mk₂'` for the common case when `R = S`. -/
@@ -251,6 +371,12 @@ def mk₂ (f : M → Nₗ → Pₗ) (H1 : ∀ m₁ m₂ n, f (m₁ + m₂) n = f
   mk₂' R R f H1 H2 H3 H4
 #align linear_map.mk₂ LinearMap.mk₂
 
+/- warning: linear_map.mk₂_apply -> LinearMap.mk₂_apply is a dubious translation:
+lean 3 declaration is
+  forall (R : Type.{u1}) [_inst_1 : CommSemiring.{u1} R] {M : Type.{u2}} {Nₗ : Type.{u3}} {Pₗ : Type.{u4}} [_inst_5 : AddCommMonoid.{u2} M] [_inst_10 : AddCommMonoid.{u3} Nₗ] [_inst_11 : AddCommMonoid.{u4} Pₗ] [_inst_14 : Module.{u1, u2} R M (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5] [_inst_19 : Module.{u1, u3} R Nₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10] [_inst_20 : Module.{u1, u4} R Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_11] (f : M -> Nₗ -> Pₗ) {H1 : forall (m₁ : M) (m₂ : M) (n : Nₗ), Eq.{succ u4} Pₗ (f (HAdd.hAdd.{u2, u2, u2} M M M (instHAdd.{u2} M (AddZeroClass.toHasAdd.{u2} M (AddMonoid.toAddZeroClass.{u2} M (AddCommMonoid.toAddMonoid.{u2} M _inst_5)))) m₁ m₂) n) (HAdd.hAdd.{u4, u4, u4} Pₗ Pₗ Pₗ (instHAdd.{u4} Pₗ (AddZeroClass.toHasAdd.{u4} Pₗ (AddMonoid.toAddZeroClass.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11)))) (f m₁ n) (f m₂ n))} {H2 : forall (c : R) (m : M) (n : Nₗ), Eq.{succ u4} Pₗ (f (SMul.smul.{u1, u2} R M 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+Case conversion may be inaccurate. Consider using '#align linear_map.mk₂_apply LinearMap.mk₂_applyₓ'. -/
 @[simp]
 theorem mk₂_apply (f : M → Nₗ → Pₗ) {H1 H2 H3 H4} (m : M) (n : Nₗ) :
     (mk₂ R f H1 H2 H3 H4 : M →ₗ[R] Nₗ →ₗ[R] Pₗ) m n = f m n :=
@@ -259,6 +385,7 @@ theorem mk₂_apply (f : M → Nₗ → Pₗ) {H1 H2 H3 H4} (m : M) (n : Nₗ) :
 
 variable (R M N P)
 
+#print LinearMap.lflip /-
 /-- Given a linear map from `M` to linear maps from `N` to `P`, i.e., a bilinear map `M → N → P`,
 change the order of variables and get a linear map from `N` to linear maps from `M` to `P`. -/
 def lflip : (M →ₛₗ[σ₁₃] N →ₛₗ[σ₂₃] P) →ₗ[R₃] N →ₛₗ[σ₂₃] M →ₛₗ[σ₁₃] P
@@ -267,11 +394,18 @@ def lflip : (M →ₛₗ[σ₁₃] N →ₛₗ[σ₂₃] P) →ₗ[R₃] N →
   map_add' _ _ := rfl
   map_smul' _ _ := rfl
 #align linear_map.lflip LinearMap.lflip
+-/
 
 variable {R M N P}
 
 variable (f : M →ₛₗ[σ₁₃] N →ₛₗ[σ₂₃] P)
 
+/- warning: linear_map.lflip_apply -> LinearMap.lflip_apply is a dubious translation:
+lean 3 declaration is
+  forall {R : Type.{u1}} [_inst_1 : CommSemiring.{u1} R] {R₂ : Type.{u2}} [_inst_2 : CommSemiring.{u2} R₂] {R₃ : Type.{u3}} [_inst_3 : CommSemiring.{u3} R₃] {M : Type.{u4}} {N : Type.{u5}} {P : Type.{u6}} [_inst_5 : AddCommMonoid.{u4} M] [_inst_6 : AddCommMonoid.{u5} N] [_inst_7 : AddCommMonoid.{u6} P] [_inst_14 : Module.{u1, u4} R M (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5] [_inst_15 : Module.{u2, u5} R₂ N (CommSemiring.toSemiring.{u2} R₂ _inst_2) _inst_6] [_inst_16 : Module.{u3, u6} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7] {σ₂₃ : RingHom.{u2, u3} R₂ R₃ (Semiring.toNonAssocSemiring.{u2} R₂ (CommSemiring.toSemiring.{u2} R₂ _inst_2)) (Semiring.toNonAssocSemiring.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3))} {σ₁₃ : RingHom.{u1, u3} R R₃ (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (Semiring.toNonAssocSemiring.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3))} (f : LinearMap.{u1, u3, u4, max u5 u6} R R₃ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₁₃ M (LinearMap.{u2, u3, u5, u6} R₂ R₃ (CommSemiring.toSemiring.{u2} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₂₃ N P _inst_6 _inst_7 _inst_15 _inst_16) _inst_5 (LinearMap.addCommMonoid.{u2, u3, u5, u6} R₂ R₃ N P (CommSemiring.toSemiring.{u2} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃) _inst_14 (LinearMap.module.{u2, u3, u3, u5, u6} R₂ R₃ R₃ N P (CommSemiring.toSemiring.{u2} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_16 (smulCommClass_self.{u3, u6} R₃ P (CommSemiring.toCommMonoid.{u3} R₃ _inst_3) (MulActionWithZero.toMulAction.{u3, u6} R₃ P (Semiring.toMonoidWithZero.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3)) (AddZeroClass.toHasZero.{u6} P (AddMonoid.toAddZeroClass.{u6} P (AddCommMonoid.toAddMonoid.{u6} P _inst_7))) 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+but is expected to have type
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(CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_5 _inst_7 _inst_14 _inst_16 σ₁₃ (MonoidWithZero.toMonoid.{u3} R₃ (Semiring.toMonoidWithZero.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3))) (Module.toDistribMulAction.{u3, u6} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7 _inst_16) (smulCommClass_self.{u3, u6} R₃ P (CommSemiring.toCommMonoid.{u3} R₃ _inst_3) (MulActionWithZero.toMulAction.{u3, u6} R₃ P (Semiring.toMonoidWithZero.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3)) (AddMonoid.toZero.{u6} P (AddCommMonoid.toAddMonoid.{u6} P _inst_7)) (Module.toMulActionWithZero.{u3, u6} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7 _inst_16))) (MonoidWithZero.toMonoid.{u3} R₃ (Semiring.toMonoidWithZero.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3))) (Module.toDistribMulAction.{u3, u6} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7 _inst_16) (smulCommClass_self.{u3, u6} R₃ P (CommSemiring.toCommMonoid.{u3} R₃ _inst_3) (MulActionWithZero.toMulAction.{u3, u6} R₃ 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(CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₂₃ N P _inst_6 _inst_7 _inst_15 _inst_16) _inst_5 (LinearMap.addCommMonoid.{u1, u3, u2, u6} R₂ R₃ N P (CommSemiring.toSemiring.{u1} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃) _inst_14 (LinearMap.instModuleLinearMapAddCommMonoid.{u1, u3, u3, u2, u6} R₂ R₃ R₃ N P (CommSemiring.toSemiring.{u1} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_16 (smulCommClass_self.{u3, u6} R₃ P (CommSemiring.toCommMonoid.{u3} R₃ _inst_3) (MulActionWithZero.toMulAction.{u3, u6} R₃ P (Semiring.toMonoidWithZero.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3)) (AddMonoid.toZero.{u6} P (AddCommMonoid.toAddMonoid.{u6} P _inst_7)) (Module.toMulActionWithZero.{u3, u6} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7 _inst_16))))) => (fun (x._@.Mathlib.Algebra.Module.LinearMap._hyg.6178 : LinearMap.{u4, u3, u5, max u6 u2} R R₃ (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₁₃ M (LinearMap.{u1, u3, u2, u6} R₂ R₃ (CommSemiring.toSemiring.{u1} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₂₃ N P _inst_6 _inst_7 _inst_15 _inst_16) _inst_5 (LinearMap.addCommMonoid.{u1, u3, u2, u6} R₂ R₃ N P (CommSemiring.toSemiring.{u1} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃) _inst_14 (LinearMap.instModuleLinearMapAddCommMonoid.{u1, u3, u3, u2, u6} R₂ R₃ R₃ N P (CommSemiring.toSemiring.{u1} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_16 (smulCommClass_self.{u3, u6} R₃ P (CommSemiring.toCommMonoid.{u3} R₃ _inst_3) (MulActionWithZero.toMulAction.{u3, u6} R₃ P (Semiring.toMonoidWithZero.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3)) (AddMonoid.toZero.{u6} P (AddCommMonoid.toAddMonoid.{u6} P _inst_7)) (Module.toMulActionWithZero.{u3, u6} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7 _inst_16))))) => LinearMap.{u1, u3, u2, max u6 u5} R₂ R₃ (CommSemiring.toSemiring.{u1} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₂₃ N (LinearMap.{u4, u3, u5, u6} R R₃ (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₁₃ M P _inst_5 _inst_7 _inst_14 _inst_16) _inst_6 (LinearMap.addCommMonoid.{u4, u3, u5, u6} R R₃ M P (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_5 _inst_7 _inst_14 _inst_16 σ₁₃) _inst_15 (LinearMap.instModuleLinearMapAddCommMonoid.{u4, u3, u3, u5, u6} R R₃ R₃ M P (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_5 _inst_7 _inst_14 _inst_16 σ₁₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_16 (smulCommClass_self.{u3, u6} R₃ P (CommSemiring.toCommMonoid.{u3} R₃ _inst_3) (MulActionWithZero.toMulAction.{u3, u6} R₃ P (Semiring.toMonoidWithZero.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3)) (AddMonoid.toZero.{u6} P (AddCommMonoid.toAddMonoid.{u6} P _inst_7)) (Module.toMulActionWithZero.{u3, u6} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7 _inst_16))))) _x) (LinearMap.instFunLikeLinearMap.{u3, u3, max (max u6 u2) u5, max (max u6 u2) u5} R₃ R₃ (LinearMap.{u4, u3, u5, max u6 u2} R R₃ (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₁₃ M (LinearMap.{u1, u3, u2, u6} R₂ R₃ (CommSemiring.toSemiring.{u1} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₂₃ N P _inst_6 _inst_7 _inst_15 _inst_16) _inst_5 (LinearMap.addCommMonoid.{u1, u3, u2, u6} R₂ R₃ N P (CommSemiring.toSemiring.{u1} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃) _inst_14 (LinearMap.instModuleLinearMapAddCommMonoid.{u1, u3, u3, u2, u6} R₂ R₃ R₃ N P (CommSemiring.toSemiring.{u1} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_16 (smulCommClass_self.{u3, u6} R₃ P (CommSemiring.toCommMonoid.{u3} R₃ _inst_3) (MulActionWithZero.toMulAction.{u3, u6} R₃ P (Semiring.toMonoidWithZero.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3)) (AddMonoid.toZero.{u6} P (AddCommMonoid.toAddMonoid.{u6} P _inst_7)) (Module.toMulActionWithZero.{u3, u6} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7 _inst_16))))) (LinearMap.{u1, u3, u2, max u6 u5} R₂ R₃ (CommSemiring.toSemiring.{u1} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₂₃ N (LinearMap.{u4, u3, u5, u6} R R₃ (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₁₃ M P _inst_5 _inst_7 _inst_14 _inst_16) _inst_6 (LinearMap.addCommMonoid.{u4, u3, u5, u6} R R₃ M P (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_5 _inst_7 _inst_14 _inst_16 σ₁₃) _inst_15 (LinearMap.instModuleLinearMapAddCommMonoid.{u4, u3, u3, u5, u6} R R₃ R₃ M P (CommSemiring.toSemiring.{u4} R _inst_1) 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+Case conversion may be inaccurate. Consider using '#align linear_map.lflip_apply LinearMap.lflip_applyₓ'. -/
 @[simp]
 theorem lflip_apply (m : M) (n : N) : lflip R M N P f n m = f m n :=
   rfl
@@ -279,34 +413,56 @@ theorem lflip_apply (m : M) (n : N) : lflip R M N P f n m = f m n :=
 
 variable (R Pₗ)
 
+#print LinearMap.lcomp /-
 /-- Composing a linear map `M → N` and a linear map `N → P` to form a linear map `M → P`. -/
 def lcomp (f : M →ₗ[R] Nₗ) : (Nₗ →ₗ[R] Pₗ) →ₗ[R] M →ₗ[R] Pₗ :=
   flip <| LinearMap.comp (flip id) f
 #align linear_map.lcomp LinearMap.lcomp
+-/
 
 variable {R Pₗ}
 
+/- warning: linear_map.lcomp_apply -> LinearMap.lcomp_apply is a dubious translation:
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+but is expected to have type
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+Case conversion may be inaccurate. Consider using '#align linear_map.lcomp_apply LinearMap.lcomp_applyₓ'. -/
 @[simp]
 theorem lcomp_apply (f : M →ₗ[R] Nₗ) (g : Nₗ →ₗ[R] Pₗ) (x : M) : lcomp R Pₗ f g x = g (f x) :=
   rfl
 #align linear_map.lcomp_apply LinearMap.lcomp_apply
 
+/- warning: linear_map.lcomp_apply' -> LinearMap.lcomp_apply' is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align linear_map.lcomp_apply' LinearMap.lcomp_apply'ₓ'. -/
 theorem lcomp_apply' (f : M →ₗ[R] Nₗ) (g : Nₗ →ₗ[R] Pₗ) : lcomp R Pₗ f g = g ∘ₗ f :=
   rfl
 #align linear_map.lcomp_apply' LinearMap.lcomp_apply'
 
 variable (P σ₂₃)
 
+#print LinearMap.lcompₛₗ /-
 /-- Composing a semilinear map `M → N` and a semilinear map `N → P` to form a semilinear map
 `M → P` is itself a linear map. -/
 def lcompₛₗ (f : M →ₛₗ[σ₁₂] N) : (N →ₛₗ[σ₂₃] P) →ₗ[R₃] M →ₛₗ[σ₁₃] P :=
   flip <| LinearMap.comp (flip id) f
 #align linear_map.lcompₛₗ LinearMap.lcompₛₗ
+-/
 
 variable {P σ₂₃}
 
 include σ₁₃
 
+/- warning: linear_map.lcompₛₗ_apply -> LinearMap.lcompₛₗ_apply is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align linear_map.lcompₛₗ_apply LinearMap.lcompₛₗ_applyₓ'. -/
 @[simp]
 theorem lcompₛₗ_apply (f : M →ₛₗ[σ₁₂] N) (g : N →ₛₗ[σ₂₃] P) (x : M) :
     lcompₛₗ P σ₂₃ f g x = g (f x) :=
@@ -317,6 +473,7 @@ omit σ₁₃
 
 variable (R M Nₗ Pₗ)
 
+#print LinearMap.llcomp /-
 /-- Composing a linear map `M → N` and a linear map `N → P` to form a linear map `M → P`. -/
 def llcomp : (Nₗ →ₗ[R] Pₗ) →ₗ[R] (M →ₗ[R] Nₗ) →ₗ[R] M →ₗ[R] Pₗ :=
   flip
@@ -324,31 +481,52 @@ def llcomp : (Nₗ →ₗ[R] Pₗ) →ₗ[R] (M →ₗ[R] Nₗ) →ₗ[R] M →
       map_add' := fun f f' => ext₂ fun g x => g.map_add _ _
       map_smul' := fun (c : R) f => ext₂ fun g x => g.map_smul _ _ }
 #align linear_map.llcomp LinearMap.llcomp
+-/
 
 variable {R M Nₗ Pₗ}
 
 section
 
+/- warning: linear_map.llcomp_apply -> LinearMap.llcomp_apply is a dubious translation:
+lean 3 declaration is
+  forall {R : Type.{u1}} [_inst_1 : CommSemiring.{u1} R] {M : Type.{u2}} {Nₗ : Type.{u3}} {Pₗ : Type.{u4}} [_inst_5 : AddCommMonoid.{u2} M] [_inst_10 : AddCommMonoid.{u3} Nₗ] [_inst_11 : AddCommMonoid.{u4} Pₗ] [_inst_14 : Module.{u1, u2} R M (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5] [_inst_19 : Module.{u1, u3} R Nₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10] [_inst_20 : Module.{u1, u4} R Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_11] (f : LinearMap.{u1, u1, u3, u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) Nₗ Pₗ _inst_10 _inst_11 _inst_19 _inst_20) (g : LinearMap.{u1, u1, u2, u3} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) M Nₗ _inst_5 _inst_10 _inst_14 _inst_19) (x : M), Eq.{succ u4} 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(Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)))) (LinearMap.module.{u1, u1, u1, u2, u3} R R R M Nₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_10 _inst_14 _inst_19 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_19 (LinearMap.llcomp._proof_1.{u1, u3} R _inst_1 Nₗ _inst_10 _inst_19)) (LinearMap.module.{u1, u1, u1, u2, u4} R R R M Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_11 _inst_14 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_20 (LinearMap.llcomp._proof_2.{u1, u4} R _inst_1 Pₗ _inst_11 _inst_20)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (CommSemiring.toSemiring.{u1} R _inst_1) (LinearMap.module.{u1, u1, u1, u2, u4} R R R M Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_11 _inst_14 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_20 (LinearMap.llcomp._proof_2.{u1, u4} R _inst_1 Pₗ _inst_11 _inst_20)) (LinearMap.llcomp._proof_4.{u1, u4, u2} R _inst_1 M Pₗ _inst_5 _inst_11 _inst_14 _inst_20))) => (LinearMap.{u1, u1, u3, u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) Nₗ Pₗ _inst_10 _inst_11 _inst_19 _inst_20) -> (LinearMap.{u1, u1, max u2 u3, max u2 u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (LinearMap.{u1, u1, u2, u3} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) M Nₗ _inst_5 _inst_10 _inst_14 _inst_19) (LinearMap.{u1, u1, u2, u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) M Pₗ _inst_5 _inst_11 _inst_14 _inst_20) (LinearMap.addCommMonoid.{u1, u1, u2, u3} R R M Nₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_10 _inst_14 _inst_19 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)))) (LinearMap.addCommMonoid.{u1, u1, u2, u4} R R M Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_11 _inst_14 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)))) (LinearMap.module.{u1, u1, u1, u2, u3} R R R M Nₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_10 _inst_14 _inst_19 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_19 (LinearMap.llcomp._proof_1.{u1, u3} R _inst_1 Nₗ _inst_10 _inst_19)) (LinearMap.module.{u1, u1, u1, u2, u4} R R R M Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_11 _inst_14 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_20 (LinearMap.llcomp._proof_2.{u1, u4} R _inst_1 Pₗ _inst_11 _inst_20)))) (LinearMap.hasCoeToFun.{u1, u1, max u3 u4, max (max u2 u3) u2 u4} R R (LinearMap.{u1, u1, u3, u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R 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(Semiring.toNonAssocSemiring.{u4} R (CommSemiring.toSemiring.{u4} R _inst_1))) (CommSemiring.toSemiring.{u4} R _inst_1) _inst_20 (smulCommClass_self.{u4, u2} R Pₗ (CommSemiring.toCommMonoid.{u4} R _inst_1) (MulActionWithZero.toMulAction.{u4, u2} R Pₗ (Semiring.toMonoidWithZero.{u4} R (CommSemiring.toSemiring.{u4} R _inst_1)) (AddMonoid.toZero.{u2} Pₗ (AddCommMonoid.toAddMonoid.{u2} Pₗ _inst_11)) (Module.toMulActionWithZero.{u4, u2} R Pₗ (CommSemiring.toSemiring.{u4} R _inst_1) _inst_11 _inst_20)))) (LinearMap.instSMulCommClassLinearMapInstSMulLinearMapInstSMulLinearMap.{u4, u4, u4, u4, u1, u2} R R R R M Pₗ (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u4} R _inst_1) _inst_5 _inst_11 _inst_14 _inst_20 (RingHom.id.{u4} R (Semiring.toNonAssocSemiring.{u4} R (CommSemiring.toSemiring.{u4} R _inst_1))) (MonoidWithZero.toMonoid.{u4} R (Semiring.toMonoidWithZero.{u4} R (CommSemiring.toSemiring.{u4} R _inst_1))) (Module.toDistribMulAction.{u4, u2} R Pₗ 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+Case conversion may be inaccurate. Consider using '#align linear_map.llcomp_apply LinearMap.llcomp_applyₓ'. -/
 @[simp]
 theorem llcomp_apply (f : Nₗ →ₗ[R] Pₗ) (g : M →ₗ[R] Nₗ) (x : M) :
     llcomp R M Nₗ Pₗ f g x = f (g x) :=
   rfl
 #align linear_map.llcomp_apply LinearMap.llcomp_apply
 
+/- warning: linear_map.llcomp_apply' -> LinearMap.llcomp_apply' is a dubious translation:
+lean 3 declaration is
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(LinearMap.addCommMonoid.{u1, u1, u2, u3} R R M Nₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_10 _inst_14 _inst_19 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)))) (LinearMap.addCommMonoid.{u1, u1, u2, u4} R R M Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_11 _inst_14 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)))) (LinearMap.module.{u1, u1, u1, u2, u3} R R R M Nₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_10 _inst_14 _inst_19 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_19 (LinearMap.llcomp._proof_1.{u1, u3} R _inst_1 Nₗ _inst_10 _inst_19)) (LinearMap.module.{u1, u1, u1, u2, u4} R R R M Pₗ (CommSemiring.toSemiring.{u1} R 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(CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) Nₗ Pₗ _inst_10 _inst_11 _inst_19 _inst_20) -> (LinearMap.{u1, u1, max u2 u3, max u2 u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (LinearMap.{u1, u1, u2, u3} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) M Nₗ _inst_5 _inst_10 _inst_14 _inst_19) (LinearMap.{u1, u1, u2, u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) M Pₗ _inst_5 _inst_11 _inst_14 _inst_20) (LinearMap.addCommMonoid.{u1, u1, u2, u3} R R M Nₗ (CommSemiring.toSemiring.{u1} R 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+but is expected to have type
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_inst_11 _inst_20)))))) (LinearMap.{u4, u4, u3, u2} R R (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u4} R _inst_1) (RingHom.id.{u4} R (Semiring.toNonAssocSemiring.{u4} R (CommSemiring.toSemiring.{u4} R _inst_1))) Nₗ Pₗ _inst_10 _inst_11 _inst_19 _inst_20) (fun (_x : LinearMap.{u4, u4, u3, u2} R R (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u4} R _inst_1) (RingHom.id.{u4} R (Semiring.toNonAssocSemiring.{u4} R (CommSemiring.toSemiring.{u4} R _inst_1))) Nₗ Pₗ _inst_10 _inst_11 _inst_19 _inst_20) => (fun (x._@.Mathlib.Algebra.Module.LinearMap._hyg.6178 : LinearMap.{u4, u4, u3, u2} R R (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u4} R _inst_1) (RingHom.id.{u4} R (Semiring.toNonAssocSemiring.{u4} R (CommSemiring.toSemiring.{u4} R _inst_1))) Nₗ Pₗ _inst_10 _inst_11 _inst_19 _inst_20) => LinearMap.{u4, u4, max u3 u1, max u2 u1} R R (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u4} R _inst_1) 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(CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u4} R _inst_1) _inst_5 _inst_11 _inst_14 _inst_20 (RingHom.id.{u4} R (Semiring.toNonAssocSemiring.{u4} R (CommSemiring.toSemiring.{u4} R _inst_1)))) (LinearMap.instModuleLinearMapAddCommMonoid.{u4, u4, u4, u1, u3} R R R M Nₗ (CommSemiring.toSemiring.{u4} R _inst_1) (CommSemiring.toSemiring.{u4} R _inst_1) _inst_5 _inst_10 _inst_14 _inst_19 (RingHom.id.{u4} R (Semiring.toNonAssocSemiring.{u4} R (CommSemiring.toSemiring.{u4} R _inst_1))) (CommSemiring.toSemiring.{u4} R _inst_1) _inst_19 (smulCommClass_self.{u4, u3} R Nₗ (CommSemiring.toCommMonoid.{u4} R _inst_1) (MulActionWithZero.toMulAction.{u4, u3} R Nₗ (Semiring.toMonoidWithZero.{u4} R (CommSemiring.toSemiring.{u4} R _inst_1)) (AddMonoid.toZero.{u3} Nₗ (AddCommMonoid.toAddMonoid.{u3} Nₗ _inst_10)) (Module.toMulActionWithZero.{u4, u3} R Nₗ (CommSemiring.toSemiring.{u4} R _inst_1) _inst_10 _inst_19)))) (LinearMap.instModuleLinearMapAddCommMonoid.{u4, u4, u4, u1, u2} R R 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+Case conversion may be inaccurate. Consider using '#align linear_map.llcomp_apply' LinearMap.llcomp_apply'ₓ'. -/
 theorem llcomp_apply' (f : Nₗ →ₗ[R] Pₗ) (g : M →ₗ[R] Nₗ) : llcomp R M Nₗ Pₗ f g = f ∘ₗ g :=
   rfl
 #align linear_map.llcomp_apply' LinearMap.llcomp_apply'
 
 end
 
+#print LinearMap.compl₂ /-
 /-- Composing a linear map `Q → N` and a bilinear map `M → N → P` to
 form a bilinear map `M → Q → P`. -/
 def compl₂ (g : Q →ₛₗ[σ₄₂] N) : M →ₛₗ[σ₁₃] Q →ₛₗ[σ₄₃] P :=
   (lcompₛₗ _ _ g).comp f
 #align linear_map.compl₂ LinearMap.compl₂
+-/
 
 include σ₄₃
 
+/- warning: linear_map.compl₂_apply -> LinearMap.compl₂_apply is a dubious translation:
+lean 3 declaration is
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+but is expected to have type
+  forall {R : Type.{u1}} [_inst_1 : CommSemiring.{u1} R] {R₂ : Type.{u7}} [_inst_2 : CommSemiring.{u7} R₂] {R₃ : Type.{u3}} [_inst_3 : CommSemiring.{u3} R₃] {R₄ : Type.{u8}} [_inst_4 : CommSemiring.{u8} R₄] {M : Type.{u2}} {N : Type.{u5}} {P : Type.{u4}} {Q : Type.{u6}} [_inst_5 : AddCommMonoid.{u2} M] [_inst_6 : AddCommMonoid.{u5} N] [_inst_7 : AddCommMonoid.{u4} P] [_inst_8 : AddCommMonoid.{u6} Q] [_inst_14 : Module.{u1, u2} R M (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5] [_inst_15 : Module.{u7, u5} R₂ N (CommSemiring.toSemiring.{u7} R₂ _inst_2) _inst_6] [_inst_16 : Module.{u3, u4} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7] [_inst_17 : Module.{u8, u6} R₄ Q (CommSemiring.toSemiring.{u8} R₄ _inst_4) _inst_8] {σ₂₃ : RingHom.{u7, u3} R₂ R₃ (Semiring.toNonAssocSemiring.{u7} R₂ (CommSemiring.toSemiring.{u7} R₂ _inst_2)) (Semiring.toNonAssocSemiring.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3))} {σ₁₃ : RingHom.{u1, u3} R R₃ (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (Semiring.toNonAssocSemiring.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3))} {σ₄₂ : RingHom.{u8, u7} R₄ R₂ (Semiring.toNonAssocSemiring.{u8} R₄ (CommSemiring.toSemiring.{u8} R₄ _inst_4)) (Semiring.toNonAssocSemiring.{u7} R₂ (CommSemiring.toSemiring.{u7} R₂ _inst_2))} {σ₄₃ : RingHom.{u8, u3} R₄ R₃ (Semiring.toNonAssocSemiring.{u8} R₄ (CommSemiring.toSemiring.{u8} R₄ _inst_4)) (Semiring.toNonAssocSemiring.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3))} [_inst_24 : RingHomCompTriple.{u8, u7, u3} R₄ R₂ R₃ (CommSemiring.toSemiring.{u8} R₄ _inst_4) (CommSemiring.toSemiring.{u7} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₄₂ σ₂₃ σ₄₃] (f : LinearMap.{u1, u3, u2, max u4 u5} R R₃ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₁₃ M (LinearMap.{u7, u3, u5, u4} R₂ R₃ (CommSemiring.toSemiring.{u7} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₂₃ N P _inst_6 _inst_7 _inst_15 _inst_16) _inst_5 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+Case conversion may be inaccurate. Consider using '#align linear_map.compl₂_apply LinearMap.compl₂_applyₓ'. -/
 @[simp]
 theorem compl₂_apply (g : Q →ₛₗ[σ₄₂] N) (m : M) (q : Q) : f.compl₂ g m q = f m (g q) :=
   rfl
@@ -356,6 +534,12 @@ theorem compl₂_apply (g : Q →ₛₗ[σ₄₂] N) (m : M) (q : Q) : f.compl
 
 omit σ₄₃
 
+/- warning: linear_map.compl₂_id -> LinearMap.compl₂_id is a dubious translation:
+lean 3 declaration is
+  forall {R : Type.{u1}} [_inst_1 : CommSemiring.{u1} R] {R₂ : Type.{u2}} [_inst_2 : CommSemiring.{u2} R₂] {R₃ : Type.{u3}} [_inst_3 : CommSemiring.{u3} R₃] {M : Type.{u4}} {N : Type.{u5}} {P : Type.{u6}} [_inst_5 : AddCommMonoid.{u4} M] [_inst_6 : AddCommMonoid.{u5} N] [_inst_7 : AddCommMonoid.{u6} P] [_inst_14 : Module.{u1, u4} R M (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5] [_inst_15 : Module.{u2, u5} R₂ N (CommSemiring.toSemiring.{u2} R₂ _inst_2) _inst_6] [_inst_16 : Module.{u3, u6} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7] {σ₂₃ : RingHom.{u2, u3} R₂ R₃ (Semiring.toNonAssocSemiring.{u2} R₂ (CommSemiring.toSemiring.{u2} R₂ _inst_2)) (Semiring.toNonAssocSemiring.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3))} {σ₁₃ : RingHom.{u1, u3} R R₃ (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (Semiring.toNonAssocSemiring.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3))} (f : LinearMap.{u1, u3, u4, max u5 u6} R R₃ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₁₃ M (LinearMap.{u2, u3, u5, u6} R₂ R₃ (CommSemiring.toSemiring.{u2} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₂₃ N P _inst_6 _inst_7 _inst_15 _inst_16) _inst_5 (LinearMap.addCommMonoid.{u2, u3, u5, u6} R₂ R₃ N P (CommSemiring.toSemiring.{u2} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃) _inst_14 (LinearMap.module.{u2, u3, u3, u5, u6} R₂ R₃ R₃ N P (CommSemiring.toSemiring.{u2} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_16 (smulCommClass_self.{u3, u6} R₃ P (CommSemiring.toCommMonoid.{u3} R₃ _inst_3) (MulActionWithZero.toMulAction.{u3, u6} R₃ P (Semiring.toMonoidWithZero.{u3} R₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3)) (AddZeroClass.toHasZero.{u6} P (AddMonoid.toAddZeroClass.{u6} P (AddCommMonoid.toAddMonoid.{u6} P _inst_7))) (Module.toMulActionWithZero.{u3, u6} R₃ P (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_7 _inst_16))))), Eq.{max (succ u4) (succ (max u5 u6))} (LinearMap.{u1, u3, u4, max u5 u6} R R₃ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₁₃ M (LinearMap.{u2, u3, u5, u6} R₂ R₃ (CommSemiring.toSemiring.{u2} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₂₃ N P _inst_6 _inst_7 _inst_15 _inst_16) _inst_5 (LinearMap.addCommMonoid.{u2, u3, u5, u6} R₂ R₃ N P (CommSemiring.toSemiring.{u2} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃) _inst_14 (LinearMap.module.{u2, u3, u3, u5, u6} R₂ R₃ R₃ N P (CommSemiring.toSemiring.{u2} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_6 _inst_7 _inst_15 _inst_16 σ₂₃ (CommSemiring.toSemiring.{u3} R₃ _inst_3) _inst_16 (LinearMap.compl₂._proof_2.{u3, u6} R₃ _inst_3 P _inst_7 _inst_16))) (LinearMap.compl₂.{u1, u2, u3, u2, u4, u5, u6, u5} R _inst_1 R₂ _inst_2 R₃ _inst_3 R₂ _inst_2 M N P N _inst_5 _inst_6 _inst_7 _inst_6 _inst_14 _inst_15 _inst_16 _inst_15 σ₂₃ σ₁₃ (RingHom.id.{u2} R₂ (Semiring.toNonAssocSemiring.{u2} R₂ (CommSemiring.toSemiring.{u2} R₂ _inst_2))) σ₂₃ (RingHomCompTriple.ids.{u2, u3} R₂ R₃ (CommSemiring.toSemiring.{u2} R₂ _inst_2) (CommSemiring.toSemiring.{u3} R₃ _inst_3) σ₂₃) f (LinearMap.id.{u2, u5} R₂ N (CommSemiring.toSemiring.{u2} R₂ _inst_2) _inst_6 _inst_15)) f
+but is expected to have type
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+Case conversion may be inaccurate. Consider using '#align linear_map.compl₂_id LinearMap.compl₂_idₓ'. -/
 @[simp]
 theorem compl₂_id : f.compl₂ LinearMap.id = f :=
   by
@@ -363,19 +547,33 @@ theorem compl₂_id : f.compl₂ LinearMap.id = f :=
   rw [compl₂_apply, id_coe, id.def]
 #align linear_map.compl₂_id LinearMap.compl₂_id
 
+#print LinearMap.compl₁₂ /-
 /-- Composing linear maps `Q → M` and `Q' → N` with a bilinear map `M → N → P` to
 form a bilinear map `Q → Q' → P`. -/
 def compl₁₂ (f : Mₗ →ₗ[R] Nₗ →ₗ[R] Pₗ) (g : Qₗ →ₗ[R] Mₗ) (g' : Qₗ' →ₗ[R] Nₗ) :
     Qₗ →ₗ[R] Qₗ' →ₗ[R] Pₗ :=
   (f.comp g).compl₂ g'
 #align linear_map.compl₁₂ LinearMap.compl₁₂
+-/
 
+/- warning: linear_map.compl₁₂_apply -> LinearMap.compl₁₂_apply is a dubious translation:
+lean 3 declaration is
+  forall {R : Type.{u1}} [_inst_1 : CommSemiring.{u1} R] {Mₗ : Type.{u2}} {Nₗ : Type.{u3}} {Pₗ : Type.{u4}} {Qₗ : Type.{u5}} {Qₗ' : Type.{u6}} [_inst_9 : AddCommMonoid.{u2} Mₗ] [_inst_10 : AddCommMonoid.{u3} Nₗ] [_inst_11 : AddCommMonoid.{u4} Pₗ] [_inst_12 : AddCommMonoid.{u5} Qₗ] [_inst_13 : AddCommMonoid.{u6} Qₗ'] [_inst_18 : Module.{u1, u2} R Mₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_9] [_inst_19 : Module.{u1, u3} R Nₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10] [_inst_20 : Module.{u1, u4} R Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_11] [_inst_21 : Module.{u1, u5} R Qₗ (CommSemiring.toSemiring.{u1} R _inst_1) _inst_12] [_inst_22 : Module.{u1, u6} R Qₗ' (CommSemiring.toSemiring.{u1} R _inst_1) _inst_13] (f : LinearMap.{u1, u1, u2, max u3 u4} R R (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) Mₗ (LinearMap.{u1, u1, u3, u4} R R 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+Case conversion may be inaccurate. Consider using '#align linear_map.compl₁₂_apply LinearMap.compl₁₂_applyₓ'. -/
 @[simp]
 theorem compl₁₂_apply (f : Mₗ →ₗ[R] Nₗ →ₗ[R] Pₗ) (g : Qₗ →ₗ[R] Mₗ) (g' : Qₗ' →ₗ[R] Nₗ) (x : Qₗ)
     (y : Qₗ') : f.compl₁₂ g g' x y = f (g x) (g' y) :=
   rfl
 #align linear_map.compl₁₂_apply LinearMap.compl₁₂_apply
 
+/- warning: linear_map.compl₁₂_id_id -> LinearMap.compl₁₂_id_id is a dubious translation:
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+Case conversion may be inaccurate. Consider using '#align linear_map.compl₁₂_id_id LinearMap.compl₁₂_id_idₓ'. -/
 @[simp]
 theorem compl₁₂_id_id (f : Mₗ →ₗ[R] Nₗ →ₗ[R] Pₗ) : f.compl₁₂ LinearMap.id LinearMap.id = f :=
   by
@@ -383,6 +581,12 @@ theorem compl₁₂_id_id (f : Mₗ →ₗ[R] Nₗ →ₗ[R] Pₗ) : f.compl₁
   simp_rw [compl₁₂_apply, id_coe, id.def]
 #align linear_map.compl₁₂_id_id LinearMap.compl₁₂_id_id
 
+/- warning: linear_map.compl₁₂_inj -> LinearMap.compl₁₂_inj is a dubious translation:
+lean 3 declaration is
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+Case conversion may be inaccurate. Consider using '#align linear_map.compl₁₂_inj LinearMap.compl₁₂_injₓ'. -/
 theorem compl₁₂_inj {f₁ f₂ : Mₗ →ₗ[R] Nₗ →ₗ[R] Pₗ} {g : Qₗ →ₗ[R] Mₗ} {g' : Qₗ' →ₗ[R] Nₗ}
     (hₗ : Function.Surjective g) (hᵣ : Function.Surjective g') :
     f₁.compl₁₂ g g' = f₂.compl₁₂ g g' ↔ f₁ = f₂ :=
@@ -399,12 +603,20 @@ theorem compl₁₂_inj {f₁ f₂ : Mₗ →ₗ[R] Nₗ →ₗ[R] Pₗ} {g : Q
     subst h
 #align linear_map.compl₁₂_inj LinearMap.compl₁₂_inj
 
+#print LinearMap.compr₂ /-
 /-- Composing a linear map `P → Q` and a bilinear map `M → N → P` to
 form a bilinear map `M → N → Q`. -/
 def compr₂ (f : M →ₗ[R] Nₗ →ₗ[R] Pₗ) (g : Pₗ →ₗ[R] Qₗ) : M →ₗ[R] Nₗ →ₗ[R] Qₗ :=
   llcomp R Nₗ Pₗ Qₗ g ∘ₗ f
 #align linear_map.compr₂ LinearMap.compr₂
+-/
 
+/- warning: linear_map.compr₂_apply -> LinearMap.compr₂_apply is a dubious translation:
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_inst_10 _inst_11 _inst_19 _inst_20) _inst_5 (LinearMap.addCommMonoid.{u1, u1, u3, u4} R R Nₗ Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10 _inst_11 _inst_19 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)))) _inst_14 (LinearMap.module.{u1, u1, u1, u3, u4} R R R Nₗ Pₗ (CommSemiring.toSemiring.{u1} R _inst_1) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_10 _inst_11 _inst_19 _inst_20 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1))) (CommSemiring.toSemiring.{u1} R _inst_1) _inst_20 (smulCommClass_self.{u1, u4} R Pₗ (CommSemiring.toCommMonoid.{u1} R _inst_1) (MulActionWithZero.toMulAction.{u1, u4} R Pₗ (Semiring.toMonoidWithZero.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (AddZeroClass.toHasZero.{u4} Pₗ (AddMonoid.toAddZeroClass.{u4} Pₗ (AddCommMonoid.toAddMonoid.{u4} Pₗ _inst_11))) (Module.toMulActionWithZero.{u1, u4} R Pₗ 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+but is expected to have type
+  forall {R : Type.{u5}} [_inst_1 : CommSemiring.{u5} R] {M : Type.{u4}} {Nₗ : Type.{u2}} {Pₗ : Type.{u3}} {Qₗ : Type.{u1}} [_inst_5 : AddCommMonoid.{u4} M] [_inst_10 : AddCommMonoid.{u2} Nₗ] [_inst_11 : AddCommMonoid.{u3} Pₗ] [_inst_12 : AddCommMonoid.{u1} Qₗ] [_inst_14 : Module.{u5, u4} R M (CommSemiring.toSemiring.{u5} R _inst_1) _inst_5] [_inst_19 : Module.{u5, u2} R Nₗ (CommSemiring.toSemiring.{u5} R _inst_1) _inst_10] [_inst_20 : Module.{u5, u3} R Pₗ (CommSemiring.toSemiring.{u5} R _inst_1) _inst_11] [_inst_21 : Module.{u5, u1} R Qₗ (CommSemiring.toSemiring.{u5} R _inst_1) _inst_12] (f : LinearMap.{u5, u5, u4, max u3 u2} R R (CommSemiring.toSemiring.{u5} R _inst_1) (CommSemiring.toSemiring.{u5} R _inst_1) (RingHom.id.{u5} R (Semiring.toNonAssocSemiring.{u5} R (CommSemiring.toSemiring.{u5} R _inst_1))) M (LinearMap.{u5, u5, u2, u3} R R (CommSemiring.toSemiring.{u5} R _inst_1) (CommSemiring.toSemiring.{u5} R _inst_1) (RingHom.id.{u5} R (Semiring.toNonAssocSemiring.{u5} R 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+Case conversion may be inaccurate. Consider using '#align linear_map.compr₂_apply LinearMap.compr₂_applyₓ'. -/
 @[simp]
 theorem compr₂_apply (f : M →ₗ[R] Nₗ →ₗ[R] Pₗ) (g : Pₗ →ₗ[R] Qₗ) (m : M) (n : Nₗ) :
     f.compr₂ g m n = g (f m n) :=
@@ -413,14 +625,22 @@ theorem compr₂_apply (f : M →ₗ[R] Nₗ →ₗ[R] Pₗ) (g : Pₗ →ₗ[R]
 
 variable (R M)
 
+#print LinearMap.lsmul /-
 /-- Scalar multiplication as a bilinear map `R → M → M`. -/
 def lsmul : R →ₗ[R] M →ₗ[R] M :=
   mk₂ R (· • ·) add_smul (fun _ _ _ => mul_smul _ _ _) smul_add fun r s m => by
     simp only [smul_smul, smul_eq_mul, mul_comm]
 #align linear_map.lsmul LinearMap.lsmul
+-/
 
 variable {R M}
 
+/- warning: linear_map.lsmul_apply -> LinearMap.lsmul_apply is a dubious translation:
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(AddMonoid.toZero.{u2} M (AddCommMonoid.toAddMonoid.{u2} M _inst_5)) (SMulWithZero.toSMulZeroClass.{u1, u2} R M (CommMonoidWithZero.toZero.{u1} R (CommSemiring.toCommMonoidWithZero.{u1} R _inst_1)) (AddMonoid.toZero.{u2} M (AddCommMonoid.toAddMonoid.{u2} M _inst_5)) (MulActionWithZero.toSMulWithZero.{u1, u2} R M (Semiring.toMonoidWithZero.{u1} R (CommSemiring.toSemiring.{u1} R _inst_1)) (AddMonoid.toZero.{u2} M (AddCommMonoid.toAddMonoid.{u2} M _inst_5)) (Module.toMulActionWithZero.{u1, u2} R M (CommSemiring.toSemiring.{u1} R _inst_1) _inst_5 _inst_14))))) r m)
+Case conversion may be inaccurate. Consider using '#align linear_map.lsmul_apply LinearMap.lsmul_applyₓ'. -/
 @[simp]
 theorem lsmul_apply (r : R) (m : M) : lsmul R M r m = r • m :=
   rfl
@@ -442,11 +662,23 @@ variable [AddCommGroup M] [AddCommGroup N] [AddCommGroup P]
 
 variable [Module R M] [Module S N] [Module R₂ P] [Module S₂ P]
 
+/- warning: linear_map.lsmul_injective -> LinearMap.lsmul_injective is a dubious translation:
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u2, u2} R R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8) (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))))) (LinearMap.addCommMonoid.{u1, u1, u2, u2} R R M M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R 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(CommRing.toCommSemiring.{u1} R _inst_1)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8)) (LinearMap.hasCoeToFun.{u1, u1, u1, u2} R R R (LinearMap.{u1, u1, u2, u2} R R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} R 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_inst_8 _inst_8 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) _inst_8 (LinearMap.lsmul._proof_1.{u1, u2} R (CommRing.toCommSemiring.{u1} R _inst_1) M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))))) (LinearMap.lsmul.{u1, u2} R (CommRing.toCommSemiring.{u1} R _inst_1) M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8) x)))
+but is expected to have type
+  forall {R : Type.{u2}} {M : Type.{u1}} [_inst_1 : CommRing.{u2} R] [_inst_5 : AddCommGroup.{u1} M] [_inst_8 : Module.{u2, u1} R M (Ring.toSemiring.{u2} R (CommRing.toRing.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5)] [_inst_12 : NoZeroSMulDivisors.{u2, u1} R M (CommMonoidWithZero.toZero.{u2} R (CommSemiring.toCommMonoidWithZero.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))) (NegZeroClass.toZero.{u1} M (SubNegZeroMonoid.toNegZeroClass.{u1} M (SubtractionMonoid.toSubNegZeroMonoid.{u1} M (SubtractionCommMonoid.toSubtractionMonoid.{u1} M (AddCommGroup.toDivisionAddCommMonoid.{u1} M _inst_5))))) (SMulZeroClass.toSMul.{u2, u1} R M (NegZeroClass.toZero.{u1} M (SubNegZeroMonoid.toNegZeroClass.{u1} M (SubtractionMonoid.toSubNegZeroMonoid.{u1} M (SubtractionCommMonoid.toSubtractionMonoid.{u1} M (AddCommGroup.toDivisionAddCommMonoid.{u1} M _inst_5))))) (SMulWithZero.toSMulZeroClass.{u2, u1} R M (CommMonoidWithZero.toZero.{u2} R (CommSemiring.toCommMonoidWithZero.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))) (NegZeroClass.toZero.{u1} M (SubNegZeroMonoid.toNegZeroClass.{u1} M (SubtractionMonoid.toSubNegZeroMonoid.{u1} M (SubtractionCommMonoid.toSubtractionMonoid.{u1} M (AddCommGroup.toDivisionAddCommMonoid.{u1} M _inst_5))))) (MulActionWithZero.toSMulWithZero.{u2, u1} R M (Semiring.toMonoidWithZero.{u2} R (Ring.toSemiring.{u2} R (CommRing.toRing.{u2} R _inst_1))) (NegZeroClass.toZero.{u1} M (SubNegZeroMonoid.toNegZeroClass.{u1} M (SubtractionMonoid.toSubNegZeroMonoid.{u1} M (SubtractionCommMonoid.toSubtractionMonoid.{u1} M (AddCommGroup.toDivisionAddCommMonoid.{u1} M _inst_5))))) (Module.toMulActionWithZero.{u2, u1} R M (Ring.toSemiring.{u2} R (CommRing.toRing.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8))))] {x : R}, (Ne.{succ u2} R x (OfNat.ofNat.{u2} R 0 (Zero.toOfNat0.{u2} R (CommMonoidWithZero.toZero.{u2} R (CommSemiring.toCommMonoidWithZero.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))))) -> 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_inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8) _x) (LinearMap.instFunLikeLinearMap.{u2, u2, u2, u1} R R R (LinearMap.{u2, u2, u1, u1} R R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))))) (LinearMap.addCommMonoid.{u2, u2, u1, u1} R R M M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))))) (Semiring.toModule.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))) (LinearMap.instModuleLinearMapAddCommMonoid.{u2, u2, u2, u1, u1} R R R M M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) _inst_8 (smulCommClass_self.{u2, u1} R M (CommSemiring.toCommMonoid.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (MulActionWithZero.toMulAction.{u2, u1} R M (Semiring.toMonoidWithZero.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))) (AddMonoid.toZero.{u1} M (AddCommMonoid.toAddMonoid.{u1} M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5))) (Module.toMulActionWithZero.{u2, u1} R M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8)))) (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))))) (LinearMap.lsmul.{u2, u1} R (CommRing.toCommSemiring.{u2} R _inst_1) M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8) x)))
+Case conversion may be inaccurate. Consider using '#align linear_map.lsmul_injective LinearMap.lsmul_injectiveₓ'. -/
 theorem lsmul_injective [NoZeroSMulDivisors R M] {x : R} (hx : x ≠ 0) :
     Function.Injective (lsmul R M x) :=
   smul_right_injective _ hx
 #align linear_map.lsmul_injective LinearMap.lsmul_injective
 
+/- warning: linear_map.ker_lsmul -> LinearMap.ker_lsmul is a dubious translation:
+lean 3 declaration is
+  forall {R : Type.{u1}} {M : Type.{u2}} [_inst_1 : CommRing.{u1} R] [_inst_5 : AddCommGroup.{u2} M] [_inst_8 : Module.{u1, u2} R M (Ring.toSemiring.{u1} R (CommRing.toRing.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5)] [_inst_12 : NoZeroSMulDivisors.{u1, u2} R M (MulZeroClass.toHasZero.{u1} R (NonUnitalNonAssocSemiring.toMulZeroClass.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R (Ring.toNonAssocRing.{u1} R (CommRing.toRing.{u1} R _inst_1)))))) (AddZeroClass.toHasZero.{u2} M (AddMonoid.toAddZeroClass.{u2} M (SubNegMonoid.toAddMonoid.{u2} M (AddGroup.toSubNegMonoid.{u2} M (AddCommGroup.toAddGroup.{u2} M _inst_5))))) (SMulZeroClass.toHasSmul.{u1, u2} R M (AddZeroClass.toHasZero.{u2} M (AddMonoid.toAddZeroClass.{u2} M (AddCommMonoid.toAddMonoid.{u2} M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5)))) (SMulWithZero.toSmulZeroClass.{u1, u2} R M (MulZeroClass.toHasZero.{u1} R (MulZeroOneClass.toMulZeroClass.{u1} R (MonoidWithZero.toMulZeroOneClass.{u1} R (Semiring.toMonoidWithZero.{u1} R (Ring.toSemiring.{u1} R (CommRing.toRing.{u1} R _inst_1)))))) (AddZeroClass.toHasZero.{u2} M (AddMonoid.toAddZeroClass.{u2} M (AddCommMonoid.toAddMonoid.{u2} M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5)))) (MulActionWithZero.toSMulWithZero.{u1, u2} R M (Semiring.toMonoidWithZero.{u1} R (Ring.toSemiring.{u1} R (CommRing.toRing.{u1} R _inst_1))) (AddZeroClass.toHasZero.{u2} M (AddMonoid.toAddZeroClass.{u2} M (AddCommMonoid.toAddMonoid.{u2} M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5)))) (Module.toMulActionWithZero.{u1, u2} R M (Ring.toSemiring.{u1} R (CommRing.toRing.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8))))] {a : R}, (Ne.{succ u1} R a (OfNat.ofNat.{u1} R 0 (OfNat.mk.{u1} R 0 (Zero.zero.{u1} R (MulZeroClass.toHasZero.{u1} R (NonUnitalNonAssocSemiring.toMulZeroClass.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R (Ring.toNonAssocRing.{u1} R (CommRing.toRing.{u1} R _inst_1)))))))))) -> (Eq.{succ u2} (Submodule.{u1, u2} R M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8) (LinearMap.ker.{u1, u1, u2, u2, u2} R R M M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) (LinearMap.{u1, u1, u2, u2} R R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8) (LinearMap.semilinearMapClass.{u1, u1, u2, u2} R R M M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))))) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (LinearMap.{u1, u1, u1, u2} R R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) R (LinearMap.{u1, u1, u2, u2} R R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8) (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))))) (LinearMap.addCommMonoid.{u1, u1, u2, u2} R R M M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))))) (Semiring.toModule.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))) (LinearMap.module.{u1, u1, u1, u2, u2} R R R M M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) _inst_8 (LinearMap.lsmul._proof_1.{u1, u2} R (CommRing.toCommSemiring.{u1} R _inst_1) M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8))) (fun (_x : LinearMap.{u1, u1, u1, u2} R R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) R (LinearMap.{u1, u1, u2, u2} R R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8) (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))))) (LinearMap.addCommMonoid.{u1, u1, u2, u2} R R M M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))))) (Semiring.toModule.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))) (LinearMap.module.{u1, u1, u1, u2, u2} R R R M M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) _inst_8 (LinearMap.lsmul._proof_1.{u1, u2} R (CommRing.toCommSemiring.{u1} R _inst_1) M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8))) => R -> (LinearMap.{u1, u1, u2, u2} R R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8)) (LinearMap.hasCoeToFun.{u1, u1, u1, u2} R R R (LinearMap.{u1, u1, u2, u2} R R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (NonUnitalNonAssocSemiring.toAddCommMonoid.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))))) (LinearMap.addCommMonoid.{u1, u1, u2, u2} R R M M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))))) (Semiring.toModule.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))) (LinearMap.module.{u1, u1, u1, u2, u2} R R R M M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)))) (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) _inst_8 (LinearMap.lsmul._proof_1.{u1, u2} R (CommRing.toCommSemiring.{u1} R _inst_1) M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8)) (RingHom.id.{u1} R (Semiring.toNonAssocSemiring.{u1} R (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1))))) (LinearMap.lsmul.{u1, u2} R (CommRing.toCommSemiring.{u1} R _inst_1) M (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8) a)) (Bot.bot.{u2} (Submodule.{u1, u2} R M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8) (Submodule.hasBot.{u1, u2} R M (CommSemiring.toSemiring.{u1} R (CommRing.toCommSemiring.{u1} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u2} M _inst_5) _inst_8)))
+but is expected to have type
+  forall {R : Type.{u2}} {M : Type.{u1}} [_inst_1 : CommRing.{u2} R] [_inst_5 : AddCommGroup.{u1} M] [_inst_8 : Module.{u2, u1} R M (Ring.toSemiring.{u2} R (CommRing.toRing.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5)] [_inst_12 : NoZeroSMulDivisors.{u2, u1} R M (CommMonoidWithZero.toZero.{u2} R (CommSemiring.toCommMonoidWithZero.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))) (NegZeroClass.toZero.{u1} M (SubNegZeroMonoid.toNegZeroClass.{u1} M (SubtractionMonoid.toSubNegZeroMonoid.{u1} M (SubtractionCommMonoid.toSubtractionMonoid.{u1} M (AddCommGroup.toDivisionAddCommMonoid.{u1} M _inst_5))))) (SMulZeroClass.toSMul.{u2, u1} R M (NegZeroClass.toZero.{u1} M (SubNegZeroMonoid.toNegZeroClass.{u1} M (SubtractionMonoid.toSubNegZeroMonoid.{u1} M (SubtractionCommMonoid.toSubtractionMonoid.{u1} M (AddCommGroup.toDivisionAddCommMonoid.{u1} M _inst_5))))) (SMulWithZero.toSMulZeroClass.{u2, u1} R M (CommMonoidWithZero.toZero.{u2} R (CommSemiring.toCommMonoidWithZero.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))) (NegZeroClass.toZero.{u1} M (SubNegZeroMonoid.toNegZeroClass.{u1} M (SubtractionMonoid.toSubNegZeroMonoid.{u1} M (SubtractionCommMonoid.toSubtractionMonoid.{u1} M (AddCommGroup.toDivisionAddCommMonoid.{u1} M _inst_5))))) (MulActionWithZero.toSMulWithZero.{u2, u1} R M (Semiring.toMonoidWithZero.{u2} R (Ring.toSemiring.{u2} R (CommRing.toRing.{u2} R _inst_1))) (NegZeroClass.toZero.{u1} M (SubNegZeroMonoid.toNegZeroClass.{u1} M (SubtractionMonoid.toSubNegZeroMonoid.{u1} M (SubtractionCommMonoid.toSubtractionMonoid.{u1} M (AddCommGroup.toDivisionAddCommMonoid.{u1} M _inst_5))))) (Module.toMulActionWithZero.{u2, u1} R M (Ring.toSemiring.{u2} R (CommRing.toRing.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8))))] {a : R}, (Ne.{succ u2} R a (OfNat.ofNat.{u2} R 0 (Zero.toOfNat0.{u2} R (CommMonoidWithZero.toZero.{u2} R (CommSemiring.toCommMonoidWithZero.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))))) -> (Eq.{succ u1} (Submodule.{u2, u1} R M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8) (LinearMap.ker.{u2, u2, u1, u1, u1} R R M M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) ((fun (x._@.Mathlib.Algebra.Module.LinearMap._hyg.6178 : R) => LinearMap.{u2, u2, u1, u1} R R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8) a) (LinearMap.instSemilinearMapClassLinearMap.{u2, u2, u1, u1} R R M M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))))) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (LinearMap.{u2, u2, u2, u1} R R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) R (LinearMap.{u2, u2, u1, u1} R R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8) (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))))) (LinearMap.addCommMonoid.{u2, u2, u1, u1} R R M M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))))) (Semiring.toModule.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))) (LinearMap.instModuleLinearMapAddCommMonoid.{u2, u2, u2, u1, u1} R R R M M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) _inst_8 (smulCommClass_self.{u2, u1} R M (CommSemiring.toCommMonoid.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (MulActionWithZero.toMulAction.{u2, u1} R M (Semiring.toMonoidWithZero.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))) (AddMonoid.toZero.{u1} M (AddCommMonoid.toAddMonoid.{u1} M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5))) (Module.toMulActionWithZero.{u2, u1} R M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8))))) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Module.LinearMap._hyg.6178 : R) => LinearMap.{u2, u2, u1, u1} R R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8) _x) (LinearMap.instFunLikeLinearMap.{u2, u2, u2, u1} R R R (LinearMap.{u2, u2, u1, u1} R R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) M M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toAddCommMonoid.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))))) (LinearMap.addCommMonoid.{u2, u2, u1, u1} R R M M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))))) (Semiring.toModule.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))) (LinearMap.instModuleLinearMapAddCommMonoid.{u2, u2, u2, u1, u1} R R R M M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8 _inst_8 (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)))) (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) _inst_8 (smulCommClass_self.{u2, u1} R M (CommSemiring.toCommMonoid.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (MulActionWithZero.toMulAction.{u2, u1} R M (Semiring.toMonoidWithZero.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))) (AddMonoid.toZero.{u1} M (AddCommMonoid.toAddMonoid.{u1} M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5))) (Module.toMulActionWithZero.{u2, u1} R M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8)))) (RingHom.id.{u2} R (Semiring.toNonAssocSemiring.{u2} R (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1))))) (LinearMap.lsmul.{u2, u1} R (CommRing.toCommSemiring.{u2} R _inst_1) M (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8) a)) (Bot.bot.{u1} (Submodule.{u2, u1} R M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8) (Submodule.instBotSubmodule.{u2, u1} R M (CommSemiring.toSemiring.{u2} R (CommRing.toCommSemiring.{u2} R _inst_1)) (AddCommGroup.toAddCommMonoid.{u1} M _inst_5) _inst_8)))
+Case conversion may be inaccurate. Consider using '#align linear_map.ker_lsmul LinearMap.ker_lsmulₓ'. -/
 theorem ker_lsmul [NoZeroSMulDivisors R M] {a : R} (ha : a ≠ 0) : (LinearMap.lsmul R M a).ker = ⊥ :=
   LinearMap.ker_eq_bot_of_injective (LinearMap.lsmul_injective ha)
 #align linear_map.ker_lsmul LinearMap.ker_lsmul
diff --git a/Mathbin/Topology/MetricSpace/Gluing.lean b/Mathbin/Topology/MetricSpace/Gluing.lean
index e85b05579d..f74c6009dd 100644
--- a/Mathbin/Topology/MetricSpace/Gluing.lean
+++ b/Mathbin/Topology/MetricSpace/Gluing.lean
@@ -643,7 +643,7 @@ theorem to_glue_commute (hΦ : Isometry Φ) (hΨ : Isometry Ψ) :
   letI := i.to_uniform_space
   funext
   simp only [comp, to_glue_l, to_glue_r]
-  refine' UniformSpace.SeparationQuotient.mk'_eq_mk'.2 (Metric.inseparable_iff.2 _)
+  refine' UniformSpace.SeparationQuotient.mk_eq_mk.2 (Metric.inseparable_iff.2 _)
   exact glue_dist_glued_points Φ Ψ 0 x
 #align metric.to_glue_commute Metric.to_glue_commute
 
@@ -766,7 +766,7 @@ theorem toInductiveLimit_commute (I : ∀ n, Isometry (f n)) (n : ℕ) :
   letI := inductive_premetric I
   funext
   simp only [comp, to_inductive_limit]
-  refine' UniformSpace.SeparationQuotient.mk'_eq_mk'.2 (Metric.inseparable_iff.2 _)
+  refine' UniformSpace.SeparationQuotient.mk_eq_mk.2 (Metric.inseparable_iff.2 _)
   show inductive_limit_dist f ⟨n.succ, f n x⟩ ⟨n, x⟩ = 0
   · rw [inductive_limit_dist_eq_dist I ⟨n.succ, f n x⟩ ⟨n, x⟩ n.succ, le_rec_on_self,
       le_rec_on_succ, le_rec_on_self, dist_self]
diff --git a/Mathbin/Topology/UniformSpace/Separation.lean b/Mathbin/Topology/UniformSpace/Separation.lean
index 215ca692fc..cdae7c91cb 100644
--- a/Mathbin/Topology/UniformSpace/Separation.lean
+++ b/Mathbin/Topology/UniformSpace/Separation.lean
@@ -531,9 +531,11 @@ instance : SeparatedSpace (SeparationQuotient α) :=
 instance [Inhabited α] : Inhabited (SeparationQuotient α) :=
   Quotient.inhabited (separationSetoid α)
 
-theorem mk'_eq_mk' {x y : α} : (⟦x⟧ : SeparationQuotient α) = ⟦y⟧ ↔ Inseparable x y :=
+#print UniformSpace.SeparationQuotient.mk_eq_mk /-
+theorem mk_eq_mk {x y : α} : (⟦x⟧ : SeparationQuotient α) = ⟦y⟧ ↔ Inseparable x y :=
   Quotient.eq''.trans separationRel_iff_inseparable
-#align uniform_space.separation_quotient.mk_eq_mk UniformSpace.SeparationQuotient.mk'_eq_mk'
+#align uniform_space.separation_quotient.mk_eq_mk UniformSpace.SeparationQuotient.mk_eq_mk
+-/
 
 #print UniformSpace.SeparationQuotient.lift /-
 /-- Factoring functions to a separated space through the separation quotient. -/
diff --git a/lake-manifest.json b/lake-manifest.json
index c1142c8f7a..7bd5b37f24 100644
--- a/lake-manifest.json
+++ b/lake-manifest.json
@@ -4,15 +4,15 @@
  [{"git":
    {"url": "https://github.com/leanprover-community/lean3port.git",
     "subDir?": null,
-    "rev": "4b6c790ac8453b9b52fb42b88b50945885119dfc",
+    "rev": "e26af3a875b2e4ec95a9327f476edaafbe82cc71",
     "name": "lean3port",
-    "inputRev?": "4b6c790ac8453b9b52fb42b88b50945885119dfc"}},
+    "inputRev?": "e26af3a875b2e4ec95a9327f476edaafbe82cc71"}},
   {"git":
    {"url": "https://github.com/leanprover-community/mathlib4.git",
     "subDir?": null,
-    "rev": "917b7089d132cb110f67f6b286dffe15eb05f9b8",
+    "rev": "0ed2027858bb128c9a6cad1700ed045c2ab59139",
     "name": "mathlib",
-    "inputRev?": "917b7089d132cb110f67f6b286dffe15eb05f9b8"}},
+    "inputRev?": "0ed2027858bb128c9a6cad1700ed045c2ab59139"}},
   {"git":
    {"url": "https://github.com/gebner/quote4",
     "subDir?": null,
diff --git a/lakefile.lean b/lakefile.lean
index eb23f0116d..0d1fd7792c 100644
--- a/lakefile.lean
+++ b/lakefile.lean
@@ -4,7 +4,7 @@ open Lake DSL System
 -- Usually the `tag` will be of the form `nightly-2021-11-22`.
 -- If you would like to use an artifact from a PR build,
 -- it will be of the form `pr-branchname-sha`.
-def tag : String := "nightly-2023-02-28-06"
+def tag : String := "nightly-2023-02-28-08"
 def releaseRepo : String := "leanprover-community/mathport"
 def oleanTarName : String := "mathlib3-binport.tar.gz"
 
@@ -38,7 +38,7 @@ target fetchOleans (_pkg : Package) : Unit := do
     untarReleaseArtifact releaseRepo tag oleanTarName libDir
   return .nil
 
-require lean3port from git "https://github.com/leanprover-community/lean3port.git"@"4b6c790ac8453b9b52fb42b88b50945885119dfc"
+require lean3port from git "https://github.com/leanprover-community/lean3port.git"@"e26af3a875b2e4ec95a9327f476edaafbe82cc71"
 
 @[default_target]
 lean_lib Mathbin where