fact: Definition inv_from_z_iso {C : precategory_data} {a b : C} (i : z_iso a b) : b --> a := is_z_isomorphism_mor (pr2 i).
imports: UniMath.Foundations.PartA UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.Tactics UniMath.CategoryTheory.Core.Categories