fact: Definition abses_pullback_compose' {A B0 B1 B2 : AbGroup@{u}} (f : B0 $-> B1) (g : B1 $-> B2) : abses_pullback (A:=A) f o abses_pullback g $=> abses_pullback (g $o f).
imports: Basics Types HSet Limits.Pullback WildCat Pointed.Core Homotopy.ExactSequence Modalities.ReflectiveSubuniverse AbGroups.AbelianGroup AbGroups.AbPullback AbGroups.Biproduct AbSES.Core AbSES.DirectSum