`{Univalence} {X : Type} {A B : AbGroup} (f : X -> AbSES B A) (E : AbSES B A) : graph_hfiber f E <~> hfiber f E := equiv_functor_sigma_id (fun _ => equiv_path_abses_iso).
Require Import Basics Types. Require Import HSet Limits.Pullback. Require Import WildCat Pointed.Core Homotopy.ExactSequence. Require Import Modalities.ReflectiveSubuniverse. Require Import AbGroups.AbelianGroup AbGroups.AbPullback AbGroups.Biproduct. Require Import AbSES.Core AbSES.DirectSum.