Lemma t : h · pr1 (pr2 i_x) · f = h · pr1 (pr2 i_x) · g. Proof. do 2 rewrite assoc'. rewrite <- pd_f. rewrite <- pd_g. rewrite assoc. rewrite q. apply assoc'. Qed.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Univalence. Require Import UniMath.CategoryTheory.Monics. Require Import UniMath.CategoryTheory.Retracts.