fact: Definition is_z_isomorphism_comp {C : precategory} {a b c : C} {f1 : a --> b} {f2 : b --> c} (H1 : is_z_isomorphism f1) (H2 : is_z_isomorphism f2) : is_z_isomorphism (f1 · f2).
imports: UniMath.Foundations.PartA UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories