fact: Definition absesmorphism_compose {A0 A1 A2 B0 B1 B2 : AbGroup@{u}} {E : AbSES B0 A0} {F : AbSES B1 A1} {G : AbSES B2 A2} (g : AbSESMorphism F G) (f : AbSESMorphism E F) : AbSESMorphism E G.
imports: Basics Types Truncations.Core HSet WildCat Groups.QuotientGroup Groups.ShortExactSequence AbelianGroup AbGroups.Biproduct AbHom Homotopy.ExactSequence Pointed Modalities.ReflectiveSubuniverse