Definition z_iso_eqrel {C : precategory} : eqrel C := (are_z_isomorphic,,iseqrel_are_z_isomorphic).
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.