fact: Definition abses_pushout_trivial_morphism {B A A' : AbGroup} (E : AbSES B A) (f : A $-> A') (phi : middle E $-> A') (k : f == phi $o inclusion E) : AbSESMorphism E (pt : AbSES B A').
imports: Basics Types Truncations.Core WildCat Pointed.Core Homotopy.ExactSequence HIT.epi Modalities.ReflectiveSubuniverse AbelianGroup AbPushout AbHom AbGroups.Biproduct AbSES.Core AbSES.DirectSum