fact: Definition abses_pullback_component1_id' {A B B' : AbGroup@{u}} {E : AbSES B A} {F : AbSES B' A} (f : AbSESMorphism E F) (h : component1 f == grp_homo_id) : E $== abses_pullback (component3 f) F.
imports: Basics Types HSet Limits.Pullback WildCat Pointed.Core Homotopy.ExactSequence Modalities.ReflectiveSubuniverse AbGroups.AbelianGroup AbGroups.AbPullback AbGroups.Biproduct AbSES.Core AbSES.DirectSum