[Merged by Bors] - feat(category_theory/opposites): Add is_iso_op #9319
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src/category_theory/opposites.lean
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| @@ -86,6 +91,9 @@ lemma is_iso_of_op {X Y : C} (f : X ⟶ Y) [is_iso f.op] : is_iso f := | |||
| ⟨⟨(inv (f.op)).unop, | |||
| ⟨quiver.hom.op_inj (by simp), quiver.hom.op_inj (by simp)⟩⟩⟩ | |||
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| lemma op_inv {X Y : C} (f : X ⟶ Y) [f_iso : is_iso f] : (inv f).op = inv f.op := | |||
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Should this be a @[simp] lemma? I'm not sure.
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It probably should, since functor.map_inv also simps towards the same direction.
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Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
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Co-authored-by: erd1 <the.erd.one@gmail.com> Co-authored-by: erdOne <36414270+erdOne@users.noreply.github.com>
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