`{Univalence} {A A' B : AbGroup} (f : A $-> A') {E F : AbSES B A} (p : E $== F) : ap (abses_pushout f) (equiv_path_abses_iso p) = equiv_path_abses_iso (fmap (abses_pushout f) p). Proof. refine (ap_abses_pushout _ _ @ _). apply (ap (equiv_path_abses_iso o _)). apply eissect. Defined.
Require Import Basics Types Truncations.Core. Require Import WildCat Pointed.Core Homotopy.ExactSequence HIT.epi. Require Import Modalities.ReflectiveSubuniverse. Require Import AbelianGroup AbPushout AbHom AbGroups.Biproduct. Require Import AbSES.Core AbSES.DirectSum.