fact: Definition issig_abses {B A : AbGroup} : {X : {E : AbGroup & (A $-> E) * (E $-> B)} & (IsEmbedding (fst X.2) * IsSurjection (snd X.2) * IsExact (Tr (-1)) (fst X.2) (snd X.2))} <~> AbSES' B A := issig_abses_do_not_print oE issig_abses_helper.
imports: Basics Types Truncations.Core HSet WildCat Groups.QuotientGroup Groups.ShortExactSequence AbelianGroup AbGroups.Biproduct AbHom Homotopy.ExactSequence Pointed Modalities.ReflectiveSubuniverse