fact: Definition equiv_join_sym (A B : Type) : Join A B <~> Join B A := equiv_homotopic_inverse (equiv_join_sym' A B) (join_sym_homotopic A B) (join_sym_homotopic B A).
imports: Basics Types Cubical NullHomotopy Extensions Colimits.Pushout Truncations.Core Truncations.Connectedness Pointed.Core WildCat Spaces.Nat.Core