proposition: Lemma functor_on_is_iso_is_iso {C C' : precategory} (F : functor C C') {a b : ob C} {f : a --> b} (H : is_iso f) : is_iso (#F f).
proof: Proof. apply (is_iso_qinv _ (#F (inv_from_iso (make_iso _ H)))). apply (is_inverse_functor_image _ _ _ _ _ (make_iso _ H)). Qed.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.MoreFoundations.Univalence UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.TransportMorphisms UniMath.CategoryTheory.Core.Univalence