Lemma zero_eq_zero_opp (C:category) (a b:ob C) (o:ZeroObject C) : zeroMap' C^op (opp_ob b) (opp_ob a) (zero_opp C o) = opp_mor (zeroMap' C a b o).
Require Import UniMath.Foundations.Preamble. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.Core.Univalence. Require Import Require Import Require Import UniMath.MoreFoundations.Tactics.