Definition is_z_iso_inv_from_z_iso {C : precategory_data} {a b : C} (I : z_iso a b) : is_z_isomorphism (inv_from_z_iso I). Proof. use make_is_z_isomorphism. - exact I. - exact (is_inverse_in_precat_inv I). Defined.
Require Import UniMath.Foundations.PartA. Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.CategoryTheory.Core.Categories.