{A : Type} {x y z : A} (p : x = z) (q : y = z) (r : x = y) : r @ q = p <~> q = r^ @ p := Build_Equiv _ _ (moveL_Vp p q r) _. Global Instance isequiv_moveL_pV {A : Type} {x y z : A} (p : z = x) (q : y = z) (r : y = x) : IsEquiv (moveL_pV p q r). Proof. destruct p. apply (isequiv_compose' _ (isequiv_concat_l _ _) _ (isequiv_concat_r _ _)). Defined.
Require Import Basics.Overture Basics.Equivalences Basics.PathGroupoids Basics.Tactics.