Definition iso_from_Cokernel_to_Cokernel {y z : C} {g : y --> z} (CK CK' : Cokernel g) : z_iso CK CK' := make_z_iso (from_Cokernel_to_Cokernel CK CK') (from_Cokernel_to_Cokernel CK' CK) (are_inverses_from_Cokernel_to_Cokernel CK CK').
Require Import UniMath.Foundations.PartD. Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Epis. Require Import UniMath.CategoryTheory.Limits.Coequalizers. Require Import UniMath.CategoryTheory.Limits.Zero. - exact (ZeroArrowFrom w). - intros y X. cbn in X. use ArrowsFromZero.