proposition: Theorem rpo_trans : forall t t1 t2, rpo t t1 -> rpo t1 t2 -> rpo t t2.
proof: Proof. intros. case (rpo_closure t2 t1 t);eauto. Qed.
imports: Arith Omega Compare_dec Relations Wellfounded Tools More_nat Wf_nat AccP not_decreasing ArithRing term rpo List