fact: Definition abses_pushout_ext `{Univalence} {B A G : AbGroup@{u}} (E : AbSES B A) : GroupHomomorphism (ab_hom A G) (ab_ext B G).
imports: Basics Types Truncations.Core Pointed WildCat Truncations.SeparatedTrunc AbelianGroup AbHom AbProjective AbSES.Pullback AbSES.BaerSum AbSES.Core