theorem thead_x_lift_y_y:
\forall (k: K).(\forall (t: T).(\forall (v: T).(\forall (h: nat).(\forall
(d: nat).((eq T (THead k v (lift h d t)) t) \to (\forall (P: Prop).P))))))
theorem thead_x_lift_y_y:
\forall (k: K).(\forall (t: T).(\forall (v: T).(\forall (h: nat).(\forall
(d: nat).((eq T (THead k v (lift h d t)) t) \to (\forall (P: Prop).P))))))