`{Funext} {A A' B B' : AbGroup} (E : AbSES B A) (F : AbSES B' A') : AbSESMorphism (abses_direct_sum E F) (abses_direct_sum F E). Proof. snrapply Build_AbSESMorphism. 1,2,3: exact direct_sum_swap. all: reflexivity. Defined.
Require Import Basics Types Truncations.Core. Require Import Pointed.Core. Require Import WildCat.Core Homotopy.ExactSequence. Require Import AbGroups.AbelianGroup AbSES.Core AbGroups.Biproduct.