fact: Definition equiv_moveL_Vp {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) _.
imports: Basics.Overture Basics.Equivalences Basics.PathGroupoids Basics.Tactics