fact: Definition concat_pA_pp {A B : Type} {f g : A -> B} (p : forall x, f x = g x) {x y : A} (q : x = y) {w z : B} (r : w = f x) (s : g y = z) : (r @ ap f q) @ (p y @ s) = (r @ p x) @ (ap g q @ s).
imports: Basics.Overture Basics.Tactics