fact: Definition abses_pullback_pconst `{Univalence} {A B B' : AbGroup} : pconst ==* @abses_pullback_pmap _ A B B' grp_homo_const.
imports: Basics Types HSet Limits.Pullback WildCat Pointed.Core Homotopy.ExactSequence Modalities.ReflectiveSubuniverse AbGroups.AbelianGroup AbGroups.AbPullback AbGroups.Biproduct AbSES.Core AbSES.DirectSum