Definition iso_from_Pushout_to_Pushout {a b c : C} {f : C⟦a, b⟧} {g : C⟦a, c⟧} (Po Po': Pushout f g) : iso (colim Po) (colim Po') := tpair _ _ (isiso_from_Pushout_to_Pushout Po Po').
Require Import UniMath.Foundations.PartD. Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Combinatorics.StandardFiniteSets. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Univalence. Require Import UniMath.CategoryTheory.Limits.Graphs.Limits. Require Import UniMath.CategoryTheory.Limits.Graphs.Colimits. Require Import UniMath.CategoryTheory.Limits.Pushouts.