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main.lean
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import breen_deligne.eval2
import breen_deligne.apply_Pow
import for_mathlib.derived.K_projective
import for_mathlib.endomorphisms.Ext
import for_mathlib.endomorphisms.functor
import for_mathlib.truncation_Ext
import for_mathlib.single_coproducts
import category_theory.limits.opposites
import for_mathlib.free_abelian_group2
import for_mathlib.has_homology_aux
import for_mathlib.exact_functor
.
noncomputable theory
universes v u
open_locale big_operators
open category_theory category_theory.limits opposite
open bounded_homotopy_category (Ext single)
namespace breen_deligne
namespace package
variables (BD : package)
variables {π : Type u} [category.{v} π] [abelian π] [enough_projectives π]
variables (F : π β₯€ π) --[preserves_filtered_colimits F]
namespace main_lemma
variables (A : π) (B : π) (j : β€)
def IH : Prop :=
(β i β€ j, is_zero $ ((Ext' i).obj (op A)).obj B) β
(β i β€ j, is_zero $ ((Ext i).obj (op ((BD.eval F).obj A))).obj ((single _ 0).obj B))
lemma IH_neg (j : β€) (hj : j β€ 0) (ih : IH BD F A B j) : IH BD F A B (j - 1) :=
begin
split; intros _ _ hij,
{ apply Ext_single_right_is_zero _ _ 1 _ _ (chain_complex.bounded_by_one _),
linarith only [hj, hij] },
{ apply Ext'_is_zero_of_neg, linarith only [hj, hij] }
end
def IH_0_aux (C : bounded_homotopy_category π) (hC : C.val.bounded_by 1) :
((Ext' 0).flip.obj B).obj (op (C.val.as.homology 0)) β
((Ext 0).obj (op C)).obj ((single π 0).obj B) :=
sorry
variables (hH0 : ((BD.eval F).obj A).val.as.homology 0 β
A)
include hH0
lemma IH_0 : IH BD F A B 0 :=
begin
apply forall_congr, intro i, apply forall_congr, intro hi0,
rw [le_iff_lt_or_eq] at hi0, rcases hi0 with (hi0|rfl),
{ split; intro,
{ apply Ext_single_right_is_zero _ _ 1 _ _ (chain_complex.bounded_by_one _),
linarith only [hi0] },
{ apply Ext'_is_zero_of_neg, linarith only [hi0] } },
apply iso.is_zero_iff,
refine ((Ext' 0).flip.obj B).map_iso hH0.op βͺβ« _,
apply IH_0_aux,
apply chain_complex.bounded_by_one,
end
lemma bdd_stepβ (j : β€) :
(β i β€ j, is_zero $ ((Ext' i).obj (op A)).obj B) β
(β i β€ j, is_zero $ ((Ext' i).obj (op $ ((BD.eval F).obj A).val.as.homology 0)).obj B) :=
begin
apply forall_congr, intro i, apply forall_congr, intro hi,
apply iso.is_zero_iff,
exact ((Ext' _).flip.obj B).map_iso hH0.op,
end
open bounded_homotopy_category (of' Ext_map_is_iso_of_quasi_iso)
lemma bdd_stepβ (j : β€) :
(β i β€ j, is_zero $ ((Ext i).obj (op ((BD.eval F).obj A))).obj ((single _ 0).obj B)) β
(β i β€ j, is_zero $ ((Ext i).obj (op $ of' $ ((BD.eval' F).obj A).truncation 0)).obj ((single _ 0).obj B)) :=
begin
apply forall_congr, intro i, apply forall_congr, intro hi,
apply iso.is_zero_iff,
refine ((Ext _).flip.obj ((single _ 0).obj B)).map_iso _,
refine iso.op _,
haveI := cochain_complex.truncation.ΞΉ_iso ((BD.eval' F).obj A) 0 _,
swap, { apply chain_complex.bounded_by_one },
let e' := (as_iso $ cochain_complex.truncation.ΞΉ ((BD.eval' F).obj A) 0),
let e := (homotopy_category.quotient _ _).map_iso e',
refine β¨e.hom, e.inv, e.hom_inv_id, e.inv_hom_idβ©,
end
omit hH0
lemma bdd_stepβ_aux (i j : β€) :
is_zero (((Ext i).obj (op $ (single π j).obj (((BD.eval F).obj A).val.as.homology j))).obj ((single π 0).obj B)) β
is_zero (((Ext i).obj (op $ of' (((BD.eval' F).obj A).imker j))).obj ((single π 0).obj B)) :=
begin
apply iso.is_zero_iff,
let Ο : of' (((BD.eval' F).obj A).imker j) βΆ (single π j).obj (((BD.eval F).obj A).val.as.homology j) :=
(homotopy_category.quotient _ _).map (cochain_complex.imker.to_single ((BD.eval' F).obj A) _),
haveI : homotopy_category.is_quasi_iso Ο :=
cochain_complex.imker.to_single_quasi_iso ((BD.eval' F).obj A) _,
let e := @as_iso _ _ _ _ _ (Ext_map_is_iso_of_quasi_iso _ _ ((single π 0).obj B) Ο i),
exact e,
end
lemma bdd_stepβ
(H : β i β€ j + 1, is_zero (((Ext i).obj (op (of' (((BD.eval' F).obj A).truncation (-1))))).obj ((single π 0).obj B))) :
(β i β€ j + 1, is_zero (((Ext i).obj (op (of' (((BD.eval' F).obj A).truncation 0)))).obj ((single π 0).obj B))) β
β i β€ j + 1, is_zero (((Ext' i).obj (op (((BD.eval F).obj A).val.as.homology 0))).obj B) :=
begin
apply forall_congr, intro i, apply forall_congr, intro hi,
refine iff.trans _ (bdd_stepβ_aux BD F A B i 0).symm,
obtain β¨i, rflβ© : β k, k+1 = i := β¨i-1, sub_add_cancel _ _β©,
have LES1 := cochain_complex.Ext_ΞΉ_succ_five_term_exact_seq ((BD.eval' F).obj A) ((single π 0).obj B) (-1) i,
have LES2 := cochain_complex.Ext_ΞΉ_succ_five_term_exact_seq ((BD.eval' F).obj A) ((single π 0).obj B) (-1) (i+1),
have aux := ((LES1.drop 2).pair.cons LES2).is_iso_of_zero_of_zero; clear LES1 LES2,
symmetry,
refine (@as_iso _ _ _ _ _ (aux _ _)).is_zero_iff; clear aux,
{ apply (H _ _).eq_of_src, exact (int.le_add_one le_rfl).trans hi },
{ apply (H _ hi).eq_of_tgt, },
end
lemma bdd_stepβ
(H : β t β€ (-1:β€), β i β€ j + 1, is_zero (((Ext i).obj (op $ (single _ t).obj (((BD.eval F).obj A).val.as.homology t))).obj ((single π 0).obj B))) :
β t β€ (-1:β€), β i β€ j + 1, is_zero (((Ext i).obj (op (of' (((BD.eval' F).obj A).truncation t)))).obj ((single π 0).obj B)) :=
begin
intros t ht i, revert ht,
apply int.induction_on' t (-i-1),
{ intros hi1 hi2,
apply Ext_single_right_is_zero _ _ (-i-1+1),
{ apply cochain_complex.truncation.bounded_by },
{ simp only [sub_add_cancel, add_left_neg], } },
{ intros k hk ih hk' hij,
have LES := cochain_complex.Ext_ΞΉ_succ_five_term_exact_seq ((BD.eval' F).obj A) ((single π 0).obj B) k i,
apply LES.pair.is_zero_of_is_zero_is_zero; clear LES,
{ erw β bdd_stepβ_aux,
apply H _ hk' _ hij, },
{ exact ih ((int.le_add_one le_rfl).trans hk') hij, }, },
{ intros k hk ih hk' hij,
apply Ext_single_right_is_zero _ _ (k-1+1),
{ apply cochain_complex.truncation.bounded_by },
{ linarith only [hk, hk', hij] } },
end
open bounded_homotopy_category (Ext0)
-- move me
def bdd_stepβ
_aux'' (X Y : bounded_homotopy_category π)
(e : bounded_homotopy_category π β bounded_homotopy_category π)
[e.functor.additive] :
(preadditive_yoneda.obj X).obj (op Y) β
(preadditive_yoneda.obj (e.functor.obj X)).obj (op (e.functor.obj Y)) :=
add_equiv.to_AddCommGroup_iso $
{ map_add' := Ξ» f g, e.functor.map_add,
.. equiv_of_fully_faithful e.functor }
instance shift_equiv_functor_additive (k : β€) :
(shift_equiv (bounded_homotopy_category π) k).functor.additive :=
bounded_homotopy_category.shift_functor_additive k
def bdd_stepβ
_aux' (X Y : bounded_homotopy_category π) (k : β€) :
(preadditive_yoneda.obj X).obj (op Y) β
(preadditive_yoneda.obj (Xβ¦kβ§)).obj (op (Yβ¦kβ§)) :=
bdd_stepβ
_aux'' _ _ $ shift_equiv _ k
def bdd_stepβ
_aux (X Y : bounded_homotopy_category π) (k : β€) :
(Ext0.obj (op X)).obj Y β
(Ext0.obj (op $ Xβ¦kβ§)).obj (Yβ¦kβ§) :=
begin
delta Ext0, dsimp only,
refine bdd_stepβ
_aux' _ _ k βͺβ«
(preadditive_yoneda.obj ((shift_functor (bounded_homotopy_category π) k).obj Y)).map_iso _,
refine iso.op _,
exact bounded_homotopy_category.replacement_iso _ _ (Xβ¦kβ§) (Xβ¦kβ§).Ο (X.Οβ¦kβ§'),
end
lemma bdd_stepβ
(k i : β€) :
is_zero (((Ext i).obj (op ((single π k).obj A))).obj ((single π 0).obj B)) β
is_zero (((Ext' (i+k)).obj (op $ A)).obj B) :=
begin
apply iso.is_zero_iff,
dsimp only [Ext', Ext, functor.comp_obj, functor.flip_obj_obj, whiskering_left_obj_obj],
refine bdd_stepβ
_aux _ _ k βͺβ« _,
refine functor.map_iso _ _ βͺβ« iso.app (functor.map_iso _ _) _,
{ refine (shift_add _ _ _).symm },
{ refine ((bounded_homotopy_category.shift_single_iso k k).app A).op.symm βͺβ« _,
refine eq_to_iso _, rw sub_self, refl },
end
-- `T` should be thought of as a tensor product functor,
-- taking tensor products with `A : Condensed Ab`
variables (T : Ab.{v} β₯€ π)
variables [β Ξ± : Type v, preserves_colimits_of_shape (discrete Ξ±) T]
variables (hT1 : T.obj (AddCommGroup.of $ punit ββ β€) β
A)
variables (hT : β {X Y Z : Ab} (f : X βΆ Y) (g : Y βΆ Z), short_exact f g β short_exact (T.map f) (T.map g))
lemma bdd_stepβ_freeβ (A : Ab) :
β (Fβ Fβ : Ab) (hβ : module.free β€ Fβ) (hβ : module.free β€ Fβ) (f : Fβ βΆ Fβ) (g : Fβ βΆ A),
short_exact f g :=
begin
let g := finsupp.total A A β€ id,
let F := g.ker,
let f := F.subtype,
let Fβ : Ab := AddCommGroup.of (β₯A ββ β€),
let Fβ : Ab := AddCommGroup.of F,
refine β¨Fβ, Fβ, _, _, f.to_add_monoid_hom, g.to_add_monoid_hom, _β©,
{ dsimp [Fβ, F],
exact submodule.free_of_pid_of_free, },
{ exact module.free.finsupp.free β€ },
{ apply_with short_exact.mk {instances:=ff},
{ rw AddCommGroup.mono_iff_injective, apply subtype.val_injective },
{ rw AddCommGroup.epi_iff_surjective, apply finsupp.total_id_surjective },
{ rw AddCommGroup.exact_iff,
ext x,
dsimp only [f, F, Fβ, AddCommGroup.coe_of],
simp only [add_monoid_hom.mem_range, linear_map.to_add_monoid_hom_coe,
submodule.subtype_apply],
refine β¨_, _β©,
{ rintro β¨y, rflβ©, exact y.2 },
{ intro h, exact β¨β¨x, hβ©, rflβ© } } }
end
include hT1
variables [has_coproducts π] [AB4 π]
lemma bdd_stepβ_freeβ
(IH : β i β€ j, is_zero $ ((Ext' i).obj (op A)).obj B)
(i : β€) (hi : i β€ j) (Ξ± : Type v) :
is_zero (((Ext' i).flip.obj B).obj (op (T.obj $ AddCommGroup.of $ Ξ± ββ β€))) :=
begin
let D : discrete Ξ± β₯€ Ab := discrete.functor (Ξ» a, AddCommGroup.of $ punit ββ β€),
let c : cocone D := cofan.mk (AddCommGroup.of $ Ξ± ββ β€)
(Ξ» a, finsupp.map_domain.add_monoid_hom $ Ξ» _, a),
let hc : is_colimit c := β¨Ξ» s, _, _, _β©,
rotate,
{ refine (finsupp.total _ _ _ (Ξ» a, _)).to_add_monoid_hom,
refine (s.ΞΉ.app a) (finsupp.single punit.star 1) },
{ intros s a, apply finsupp.add_hom_ext', rintro β¨β©, apply add_monoid_hom.ext_int,
simp only [add_monoid_hom.comp_apply, category_theory.comp_apply,
linear_map.to_add_monoid_hom_coe, cofan.mk_ΞΉ_app,
finsupp.map_domain.add_monoid_hom_apply, finsupp.map_domain_single,
finsupp.single_add_hom_apply, finsupp.total_single, one_smul], },
{ intros s m h,
apply finsupp.add_hom_ext', intro a, apply add_monoid_hom.ext_int,
simp only [add_monoid_hom.comp_apply, linear_map.to_add_monoid_hom_coe,
finsupp.single_add_hom_apply, finsupp.total_single, one_smul],
rw β h,
simp only [category_theory.comp_apply, cofan.mk_ΞΉ_app,
finsupp.map_domain.add_monoid_hom_apply, finsupp.map_domain_single], },
let c' := T.map_cocone c,
let hc' : is_colimit c' := is_colimit_of_preserves T hc,
let c'' := ((Ext' i).flip.obj B).right_op.map_cocone c',
let hc'' : is_colimit c'' := is_colimit_of_preserves _ hc',
change is_zero c''.X.unop,
apply is_zero.unop,
haveI : has_colimits Ab.{v}α΅α΅ := has_colimits_op_of_has_limits.{v v+1},
let e : c''.X β
colimit ((D β T) β ((Ext' i).flip.obj B).right_op) :=
hc''.cocone_point_unique_up_to_iso (colimit.is_colimit _),
apply is_zero.of_iso _ e,
apply is_zero_colimit,
intros j,
apply is_zero.of_iso _ (((Ext' i).flip.obj B).right_op.map_iso hT1),
apply (IH i hi).op,
end
lemma bdd_stepβ_free
(IH : β i β€ j, is_zero $ ((Ext' i).obj (op A)).obj B)
(i : β€) (hi : i β€ j) (A' : Ab) (hA' : module.free β€ A') :
is_zero (((Ext' i).flip.obj B).obj (op (T.obj A'))) :=
begin
let e' := module.free.choose_basis β€ A',
let e'' := e'.repr.to_add_equiv,
let e : A' β
(AddCommGroup.of $ module.free.choose_basis_index β€ A' ββ β€),
{ refine add_equiv_iso_AddCommGroup_iso.hom _, exact e'' },
refine is_zero.of_iso _ (functor.map_iso _ (T.map_iso e).op.symm),
apply bdd_stepβ_freeβ A B j T hT1 IH i hi,
end
include hT
lemma bdd_stepβ
(IH : β i β€ j, is_zero $ ((Ext' i).obj (op A)).obj B)
(i : β€) (hi : i β€ j) (A' : Ab) :
is_zero (((Ext' i).flip.obj B).obj (op (T.obj A'))) :=
begin
obtain β¨Fβ, Fβ, hβ, hβ, f, g, hfgβ© := bdd_stepβ_freeβ A',
specialize hT f g hfg,
obtain β¨i, rflβ© : β k, k+1=i := β¨i-1, sub_add_cancel _ _β©,
have := ((hT.Ext'_five_term_exact_seq B i).drop 2).pair,
apply this.is_zero_of_is_zero_is_zero,
{ apply bdd_stepβ_free A B j T hT1 IH _ ((int.le_add_one le_rfl).trans hi) _ hβ, },
{ apply bdd_stepβ_free A B j T hT1 IH _ hi _ hβ, },
end
variables (hAT : β t β€ (-1:β€), β A', nonempty (T.obj A' β
((BD.eval F).obj A).val.as.homology t))
include hH0 hAT
lemma bdd_step (j : β€) (hj : 0 β€ j) (ih : IH BD F A B j) : IH BD F A B (j + 1) :=
begin
by_cases ih' : (β i β€ j, is_zero $ ((Ext' i).obj (op A)).obj B), swap,
{ split,
{ intro h, refine (ih' $ Ξ» i hi, _).elim, apply h _ (int.le_add_one hi), },
{ intro h, refine (ih' $ ih.mpr $ Ξ» i hi, _).elim, apply h _ (int.le_add_one hi), } },
refine (bdd_stepβ BD F _ _ hH0 _).trans ((bdd_stepβ BD F _ _ hH0 _).trans _).symm,
apply bdd_stepβ,
apply bdd_stepβ BD F A B _ _ _ le_rfl,
intros t ht i hi,
rw bdd_stepβ
,
obtain β¨A', β¨eβ©β© := hAT t ht,
apply (((Ext' (i+t)).flip.obj B).map_iso e.op).is_zero_iff.mpr,
apply bdd_stepβ A B _ T hT1 @hT ih',
linarith only [ht, hi]
end
-- This requires more hypotheses on `BD` and `F`.
-- We'll figure them out while proving the lemma.
-- These extra hypotheses are certainly satisfies by
-- `BD = breen_deligne.package.eg` and
-- `F` = "free condensed abelian group"
-- Also missing: the condition that `A` is torsion free.
lemma bdd (j : β€) : IH BD F A B j :=
begin
apply int.induction_on' j,
{ exact IH_0 BD F A B hH0 },
{ exact bdd_step BD F A B hH0 T hT1 @hT hAT },
{ exact IH_neg BD F A B, },
end
lemma is_zero :
(β i, is_zero $ ((Ext' i).obj (op A)).obj B) β
(β i, is_zero $ ((Ext i).obj (op ((BD.eval F).obj A))).obj ((single _ 0).obj B)) :=
begin
split,
{ intros H j,
refine (bdd BD F A B hH0 T hT1 @hT hAT j).mp _ j le_rfl,
intros i hij,
apply H },
{ intros H j,
refine (bdd BD F A B hH0 T hT1 @hT hAT j).mpr _ j le_rfl,
intros i hij,
apply H }
end
end main_lemma
section
variables [has_coproducts_of_shape (ulift.{v} β) π]
variables [has_products_of_shape (ulift.{v} β) π]
open category_theory.preadditive
@[simps, nolint unused_arguments]
def Pow_X (X : endomorphisms π) (n : β) :
((Pow n).obj X).X β
(Pow n).obj X.X :=
(apply_Pow (endomorphisms.forget π) n).app X
.
instance eval'_bounded_above (X : π) : ((homotopy_category.quotient π (complex_shape.up β€)).obj ((BD.eval' F).obj X)).is_bounded_above :=
((BD.eval F).obj X).bdd
def mk_bo_ha_ca'_Q (X : π) (f : X βΆ X) :
endomorphisms.mk_bo_ho_ca' ((BD.eval' F).obj X) ((BD.eval' F).map f) β
(BD.eval F.map_endomorphisms).obj β¨X, fβ© :=
bounded_homotopy_category.mk_iso $ (homotopy_category.quotient _ _).map_iso
begin
refine homological_complex.hom.iso_of_components _ _,
{ intro i,
refine endomorphisms.mk_iso _ _,
{ rcases i with ((_|i)|i),
{ refine F.map_iso _, symmetry, refine (Pow_X _ _) },
{ refine (is_zero_zero _).iso _, apply endomorphisms.is_zero_X, exact is_zero_zero _ },
{ refine F.map_iso _, symmetry, refine (Pow_X _ _) } },
{ rcases i with ((_|i)|i),
{ show F.map _ β« F.map _ = F.map _ β« F.map _,
rw [β F.map_comp, β F.map_comp], congr' 1,
apply biproduct.hom_ext', intro j,
dsimp only [Pow, Pow_X_hom, Pow_X_inv, iso.symm_hom],
rw [biproduct.ΞΉ_map_assoc, biproduct.ΞΉ_desc, biproduct.ΞΉ_desc_assoc, β endomorphisms.hom.comm], },
{ apply is_zero.eq_of_tgt, apply endomorphisms.is_zero_X, exact is_zero_zero _ },
{ show F.map _ β« F.map _ = F.map _ β« F.map _,
rw [β F.map_comp, β F.map_comp], congr' 1,
apply biproduct.hom_ext', intro j,
dsimp only [Pow, Pow_X_hom, Pow_X_inv, iso.symm_hom],
rw [biproduct.ΞΉ_map_assoc, biproduct.ΞΉ_desc, biproduct.ΞΉ_desc_assoc, β endomorphisms.hom.comm], } } },
{ rintro i j (rfl : _ = _), ext, rcases i with (i|(_|i)),
{ apply is_zero.eq_of_tgt, apply endomorphisms.is_zero_X, exact is_zero_zero _ },
{ change F.map _ β« _ = _ β« F.map _,
dsimp only, erw [eval'_obj_d_0 _ _ _ 0, eval'_obj_d_0 _ _ _ 0],
simp only [universal_map.eval_Pow, free_abelian_group.lift_eq_sum, β endomorphisms.forget_map,
sum_comp, comp_sum, nat_trans.app_sum, functor.map_sum, whisker_right_app,
zsmul_comp, comp_zsmul, nat_trans.app_zsmul, functor.map_zsmul],
refine finset.sum_congr rfl _, intros g hg, refine congr_arg2 _ rfl _,
dsimp only [endomorphisms.forget_map, functor.map_endomorphisms_map_f],
rw [β functor.map_comp, β functor.map_comp], congr' 1,
dsimp only [basic_universal_map.eval_Pow_app, iso.symm_hom, Pow_X_inv],
ext j : 2,
rw [biproduct.ΞΉ_desc_assoc, biproduct.ΞΉ_matrix_assoc, β endomorphisms.comp_f,
biproduct.ΞΉ_matrix, biproduct.lift_desc],
have := (endomorphisms.forget _).map_id β¨X,fβ©, dsimp only [endomorphisms.forget_obj] at this,
simp only [β endomorphisms.forget_map, β this, β functor.map_zsmul, β functor.map_sum, β functor.map_comp],
congr' 1,
apply biproduct.hom_ext, intro i,
simp only [biproduct.lift_Ο, sum_comp, category.assoc],
rw finset.sum_eq_single_of_mem i (finset.mem_univ _),
{ rw [biproduct.ΞΉ_Ο, dif_pos rfl, eq_to_hom_refl, category.comp_id], },
{ rintro k - hk, rw [biproduct.ΞΉ_Ο_ne _ hk, comp_zero], } },
{ change F.map _ β« _ = _ β« F.map _,
dsimp only, erw [eval'_obj_d, eval'_obj_d],
simp only [universal_map.eval_Pow, free_abelian_group.lift_eq_sum, β endomorphisms.forget_map,
sum_comp, comp_sum, nat_trans.app_sum, functor.map_sum, whisker_right_app,
zsmul_comp, comp_zsmul, nat_trans.app_zsmul, functor.map_zsmul],
refine finset.sum_congr rfl _, intros g hg, refine congr_arg2 _ rfl _,
dsimp only [endomorphisms.forget_map, functor.map_endomorphisms_map_f],
rw [β functor.map_comp, β functor.map_comp], congr' 1,
dsimp only [basic_universal_map.eval_Pow_app, iso.symm_hom, Pow_X_inv],
ext j : 2,
rw [biproduct.ΞΉ_desc_assoc, biproduct.ΞΉ_matrix_assoc, β endomorphisms.comp_f,
biproduct.ΞΉ_matrix, biproduct.lift_desc],
have := (endomorphisms.forget _).map_id β¨X,fβ©, dsimp only [endomorphisms.forget_obj] at this,
simp only [β endomorphisms.forget_map, β this, β functor.map_zsmul, β functor.map_sum, β functor.map_comp],
congr' 1,
apply biproduct.hom_ext, intro i,
simp only [biproduct.lift_Ο, sum_comp, category.assoc],
rw finset.sum_eq_single_of_mem i (finset.mem_univ _),
{ rw [biproduct.ΞΉ_Ο, dif_pos rfl, eq_to_hom_refl, category.comp_id], },
{ rintro k - hk, rw [biproduct.ΞΉ_Ο_ne _ hk, comp_zero], } }, }
end
section
def eval_mk_end (A : π) (f : A βΆ A) :
homological_complex.mk_end
(((data.eval_functor F).obj BD.data).obj A)
(((data.eval_functor F).obj BD.data).map f) β
((data.eval_functor F.map_endomorphisms).obj BD.data).obj β¨A, fβ© :=
begin
refine homological_complex.hom.iso_of_components _ _,
{ intro i, refine endomorphisms.mk_iso _ _,
{ refine F.map_iso _, exact (Pow_X β¨A,fβ© _).symm, },
{ dsimp [homological_complex.mk_end],
rw [β F.map_comp, β F.map_comp], congr' 1,
ext j,
simp only [category.assoc, biproduct.ΞΉ_map_assoc, biproduct.map_desc_assoc,
biproduct.ΞΉ_desc, biproduct.ΞΉ_desc_assoc],
rw β endomorphisms.hom.comm, } },
{ rintro _ i (rfl : _ = _), ext k,
dsimp [homological_complex.mk_end, endomorphisms.mk_iso],
simp only [universal_map.eval_Pow, free_abelian_group.lift_eq_sum, β endomorphisms.forget_map,
nat_trans.app_sum, functor.map_sum, comp_sum, sum_comp,
nat_trans.app_zsmul, functor.map_zsmul, comp_zsmul, zsmul_comp],
refine finset.sum_congr rfl _,
intros x hx,
refine congr_arg2 _ rfl _,
dsimp only [endomorphisms.forget_map, functor.map_endomorphisms_map_f,
whisker_right_app, basic_universal_map.eval_Pow_app],
rw [β functor.map_comp, β functor.map_comp], congr' 1,
ext j : 2,
rw [biproduct.ΞΉ_desc_assoc, biproduct.ΞΉ_matrix_assoc, β endomorphisms.comp_f,
biproduct.ΞΉ_matrix, biproduct.lift_desc],
have := (endomorphisms.forget _).map_id β¨A,fβ©, dsimp only [endomorphisms.forget_obj] at this,
simp only [β endomorphisms.forget_map, β this, β functor.map_zsmul, β functor.map_sum, β functor.map_comp],
congr' 1,
apply biproduct.hom_ext, intro i,
simp only [biproduct.lift_Ο, sum_comp, category.assoc],
rw finset.sum_eq_single_of_mem i (finset.mem_univ _),
{ rw [biproduct.ΞΉ_Ο, dif_pos rfl, eq_to_hom_refl, category.comp_id], },
{ rintro k - hk, rw [biproduct.ΞΉ_Ο_ne _ hk, comp_zero], } }
end
variables [has_finite_limits π] [has_finite_colimits π]
variables (hH0 : ((data.eval_functor F).obj BD.data) β homology_functor _ _ 0 β
π _)
variables (X : endomorphisms π)
def forget_eval :
endomorphisms.forget _ β (data.eval_functor F).obj BD.data β
(data.eval_functor F.map_endomorphisms).obj BD.data β (endomorphisms.forget π).map_homological_complex _ :=
sorry
def eval'_homology :
BD.eval' F β homology_functor π (complex_shape.up β€) 0 β
(data.eval_functor F).obj BD.data β homology_functor π (complex_shape.down β) 0 :=
nat_iso.of_components (Ξ» X, homology_embed_iso _ 0 : _)
begin
intros X Y f, dsimp only [functor.comp_map, homology_embed_iso],
ext, simp only [category.assoc],
erw [homology.Ο'_map_assoc, homology.map_ΞΉ],
show _ β« _ β« has_homology.map _ _ _ _ β« _ = _,
sorry
end
def hH0_endoβ_a :
BD.eval' F.map_endomorphisms β homology_functor _ _ 0 β endomorphisms.forget π β
(data.eval_functor F.map_endomorphisms).obj BD.data β homology_functor _ _ 0 β endomorphisms.forget π :=
((whiskering_right _ _ _).obj (endomorphisms.forget π)).map_iso (eval'_homology _ _)
def hH0_endoβ_b :
(data.eval_functor F.map_endomorphisms).obj BD.data β homology_functor _ _ 0 β endomorphisms.forget π β
(data.eval_functor F.map_endomorphisms).obj BD.data β (endomorphisms.forget π).map_homological_complex _ β homology_functor _ _ 0 :=
((whiskering_left _ _ _).obj ((data.eval_functor _).obj BD.data)).map_iso
((endomorphisms.forget π).homology_functor_iso _ 0)
def hH0_endoβ_c :
(data.eval_functor F.map_endomorphisms).obj BD.data β (endomorphisms.forget π).map_homological_complex _ β homology_functor _ _ 0 β
endomorphisms.forget _ β (data.eval_functor F).obj BD.data β homology_functor _ _ 0 :=
(((whiskering_right _ _ _).obj (homology_functor π (complex_shape.down β) 0)).map_iso (forget_eval BD F).symm : _)
def hH0_endoβ :
BD.eval' F.map_endomorphisms β homology_functor (endomorphisms π) _ 0 β endomorphisms.forget π β
endomorphisms.forget _ β (data.eval_functor F).obj BD.data β homology_functor π _ 0 :=
hH0_endoβ_a _ _ βͺβ« hH0_endoβ_b _ _ βͺβ« hH0_endoβ_c _ _
def hH0_endoβ :
((BD.eval' F.map_endomorphisms β homology_functor (endomorphisms π) (complex_shape.up β€) 0).obj X).X β
X.X :=
(hH0_endoβ _ _).app _ βͺβ« hH0.app _
def hH0_endo :
(BD.eval' F.map_endomorphisms β homology_functor (endomorphisms π) (complex_shape.up β€) 0).obj X β
X :=
endomorphisms.mk_iso (hH0_endoβ _ _ hH0 X)
begin
dsimp only [hH0_endoβ, iso.trans_hom, iso_whisker_left_hom, iso.app_hom, whisker_left_app],
have := hH0.hom.naturality X.e, simp only [functor.id_map] at this,
simp only [category.assoc], erw [β this], clear this, simp only [β category.assoc],
refine congr_arg2 _ _ rfl,
let Ο : X βΆ X := β¨X.e, rflβ©,
have := (hH0_endoβ BD F).hom.naturality Ο, erw [β this], clear this,
refine congr_arg2 _ _ rfl,
dsimp only [functor.comp_map, endomorphisms.forget_map],
-- let e := ((endomorphisms.forget π).homology_functor_iso (complex_shape.up β€) 0).hom,
-- have := e.naturality,
sorry
end
end
variables [has_coproducts (endomorphisms π)]
variables [AB4 (endomorphisms π)]
lemma main_lemma [has_finite_limits π] [has_finite_colimits π]
(A : π) (B : π) (f : A βΆ A) (g : B βΆ B)
(hH0 : ((data.eval_functor F).obj BD.data) β homology_functor _ _ 0 β
π _)
(T : Ab.{v} β₯€ endomorphisms π) [Ξ (Ξ± : Type v), preserves_colimits_of_shape (discrete Ξ±) T]
(hT0 : T.obj (AddCommGroup.of (punit ββ β€)) β
β¨A, fβ©)
(hT : β {X Y Z : Ab} (f : X βΆ Y) (g : Y βΆ Z),
short_exact f g β short_exact (T.map f) (T.map g))
(hTA : β t β€ (-1:β€), (β (A' : Ab),
nonempty (T.obj A' β
((BD.eval F.map_endomorphisms).obj β¨A, fβ©).val.as.homology t))) :
(β i, is_iso $ ((Ext' i).map f.op).app B - ((Ext' i).obj (op A)).map g) β
(β i, is_iso $
((Ext i).map ((BD.eval F).map f).op).app ((single _ 0).obj B) -
((Ext i).obj (op $ (BD.eval F).obj A)).map ((single _ 0).map g)) :=
begin
rw [β endomorphisms.Ext'_is_zero_iff A B f g],
erw [β endomorphisms.Ext_is_zero_iff],
refine (main_lemma.is_zero BD F.map_endomorphisms _ _ _ T hT0 @hT hTA).trans _,
{ exact hH0_endo _ _ hH0 _ },
apply forall_congr, intro i,
apply iso.is_zero_iff,
refine functor.map_iso _ _ βͺβ« iso.app (functor.map_iso _ _) _,
{ exact iso.refl _, },
{ refine iso.op _, apply functor.map_iso,
apply eval_mk_end },
end
end
end package
end breen_deligne