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[Merged by Bors] - chore(CategoryTheory): deprecate Adjunction.leftAdjointsCoyonedaEquiv #37943

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[Merged by Bors] - chore(CategoryTheory): deprecate Adjunction.leftAdjointsCoyonedaEquiv #37943

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2 changes: 2 additions & 0 deletions Mathlib/CategoryTheory/Adjunction/Opposites.lean
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Expand Up @@ -78,12 +78,14 @@ set_option backward.isDefEq.respectTransparency false in
`F.op ⋙ coyoneda ≅ F'.op ⋙ coyoneda`.
We use this in combination with `fullyFaithfulCancelRight` to show left adjoints are unique.
-/
@[deprecated "No replacement" (since := "2026-04-11")]
def leftAdjointsCoyonedaEquiv {F F' : C ⥤ D} {G : D ⥤ C} (adj1 : F ⊣ G) (adj2 : F' ⊣ G) :
F.op ⋙ coyoneda ≅ F'.op ⋙ coyoneda :=
NatIso.ofComponents fun X =>
NatIso.ofComponents fun Y =>
((adj1.homEquiv X.unop Y).trans (adj2.homEquiv X.unop Y).symm).toIso

set_option linter.deprecated false in
/-- Deprecated: prefer `(Adjunction.conjugateIsoEquiv adj1 adj2).symm`. -/
@[deprecated "Use `(Adjunction.conjugateIsoEquiv adj1 adj2).symm` \
(requires `import Mathlib.CategoryTheory.Adjunction.Mates`)." (since := "2026-01-31")]
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