`{Univalence} {A B : AbGroup@{u}} (E F G : AbSES B A) : AbSES B A := abses_pullback ab_triagonal (abses_pushout ab_cotriagonal (abses_direct_sum (abses_direct_sum E F) G)).
Require Import Basics Types. Require Import WildCat Pointed.Core. Require Import AbGroups.AbelianGroup AbGroups.Biproduct AbGroups.AbHom. Require Import AbSES.Core AbSES.Pullback AbSES.Pushout AbSES.DirectSum. Require Import Homotopy.HSpace.Core.