`{Univalence} {A B B' : AbGroup} : pconst ==* @abses_pullback_pmap _ A B B' grp_homo_const. Proof. refine (pmap_abses_const_to_pointed @* _). rapply equiv_ptransformation_phomotopy. exact '. Defined.
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.