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[Merged by Bors] - feat: add a coe to ideal quotient rings #6620

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[Merged by Bors] - feat: add a coe to ideal quotient rings #6620

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feat: add a coe to ideal quotient rings
alexjbest Aug 16, 2023
39ecb02
use coe in place of coetc
alexjbest Aug 17, 2023
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3 changes: 3 additions & 0 deletions Mathlib/RingTheory/Ideal/Quotient.lean
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Expand Up @@ -104,6 +104,9 @@ def mk (I : Ideal R) : R →+* R ⧸ I where
map_add' _ _ := rfl
#align ideal.quotient.mk Ideal.Quotient.mk

instance {I : Ideal R} : CoeTC R (R ⧸ I) :=
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⟨Ideal.Quotient.mk I⟩

/-- Two `RingHom`s from the quotient by an ideal are equal if their
compositions with `Ideal.Quotient.mk'` are equal.

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