fact: Definition iscomplex_abses {A B : AbGroup} (E : AbSES' B A) : IsComplex (inclusion E) (projection E) := cx_isexact.
imports: Basics Types Truncations.Core HSet WildCat Groups.QuotientGroup Groups.ShortExactSequence AbelianGroup AbGroups.Biproduct AbHom Homotopy.ExactSequence Pointed Modalities.ReflectiveSubuniverse