fact: Definition abses_pullback_const `{Univalence} {A B B' : AbGroup} : const pt == @abses_pullback A B B' grp_homo_const := fun x => (equiv_path_abses_iso (abses_pullback_const' x)).
imports: Basics Types HSet Limits.Pullback WildCat Pointed.Core Homotopy.ExactSequence Modalities.ReflectiveSubuniverse AbGroups.AbelianGroup AbGroups.AbPullback AbGroups.Biproduct AbSES.Core AbSES.DirectSum