`{Univalence} {B A : AbGroup} (E : AbSES B A) : pt = abses_pullback (projection E) E := abses_pullback_component1_id (abses_pullback_projection_morphism E) (fun _ => idpath).
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.