proposition: Lemma functor_on_iso_is_iso (C C' : precategory) (F : functor C C') (a b : ob C) (f : iso a b) : is_iso (#F f).
proof: Proof. apply (is_iso_qinv _ (#F (inv_from_iso f))). apply is_inverse_functor_image. Defined.
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