fact: Definition equiv_ptransformation_phomotopy `{Univalence} {B' A' B A : AbGroup@{u}} {f g : AbSES B A -->* AbSES B' A'} : f $=>* g <~> to_pointed f ==* to_pointed g.
imports: Basics Types Truncations.Core HSet WildCat Groups.QuotientGroup Groups.ShortExactSequence AbelianGroup AbGroups.Biproduct AbHom Homotopy.ExactSequence Pointed Modalities.ReflectiveSubuniverse