proposition: Lemma transport_source_is_iso {C : precategory} {x y z : ob C} (f : x --> y) (H : is_iso f) (e : x = z) : is_iso (transportf (λ x' : ob C, precategory_morphisms x' y) e f).
proof: Proof. induction e. apply H. Qed.
imports: UniMath.Foundations.PartA UniMath.Foundations.UnivalenceAxiom UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos