proposition: Lemma lt_inv_b : forall a n b b', cons a n b < cons a n b' -> b < b'.
proof: Proof. inversion_clear 1; auto with arith T1. elim (lt_irr (a:=a));auto. elim (lt_irrefl n);auto. Qed.
imports: Arith Omega Compare_dec Relations Wellfounded Tools More_nat Wf_nat AccP not_decreasing ArithRing term rpo List