{A B} (P : A -> B -> Type) {x1 x2 x3 : A} {y1 y2 y3 : B} (p1 : x1 = x2) (p2 : x2 = x3) (q1 : y1 = y2) (q2 : y2 = y3) (z : P x1 y1) : transport011 P (p1 @ p2) (q1 @ q2) z = transport011 P p2 q2 (transport011 P p1 q1 z). Proof. destruct p1, p2, q1, q2; reflexivity. Defined.
Require Import Basics.Overture Basics.Tactics.