(A B : Type) : NatEquiv (opyon_0gpd (Join A B)) (opyon_0gpd (Join B A)) := natequiv_compose (join_rec_natequiv B A) (natequiv_compose (joinrecdata_sym_natequiv A B) (join_rec_inv_natequiv A B)).
Require Import Basics Types. Require Import Cubical.DPath Cubical.PathSquare. Require Import NullHomotopy. Require Import Extensions. Require Import Colimits.Pushout. Require Import Truncations.Core Truncations.Connectedness. Require Import Pointed.Core. Require Import WildCat. Require Import Spaces.Nat.Core.