fact: Definition ab_pushout {A B C : AbGroup} (f : A $-> B) (g : A $-> C) : AbGroup := QuotientAbGroup (ab_biprod B C) (ab_pushout_subgroup f g).
imports: Basics Types Truncations.Core Modalities.ReflectiveSubuniverse WildCat.Core HSet Algebra.Groups.Image Algebra.Groups.QuotientGroup AbGroups.AbelianGroup AbGroups.Biproduct