`{Univalence} {A B B' : AbGroup} (f : B' $-> B) : abses_pullback f pt = pt :> AbSES B' A := equiv_path_abses_iso (' f).
Require Import Basics Types. Require Import HSet Limits.Pullback. Require Import WildCat Pointed.Core Homotopy.ExactSequence. Require Import Modalities.ReflectiveSubuniverse. Require Import AbGroups.AbelianGroup AbGroups.AbPullback AbGroups.Biproduct. Require Import AbSES.Core AbSES.DirectSum.