fact: Definition isexact_ext_contra_sixterm_iv_mor `{Univalence} {B A G : AbGroup} (E : AbSES B A) (F : AbSES B G) (p : abses_pullback (projection E) F = pt) : AbSESMorphism E F.
imports: Basics Types WildCat HSet Pointed.Core Pointed.pTrunc Pointed.pEquiv Modalities.ReflectiveSubuniverse Truncations.Core Truncations.SeparatedTrunc AbGroups Homotopy.ExactSequence AbSES.Core AbSES.Pullback AbSES.Pushout BaerSum Ext PullbackFiberSequence