proposition: Lemma nf_inv_tail : forall a b n c , nf (gcons a b n c) -> c t2< [a,b].
proof: Proof. inversion_clear 1. - auto with T2. - apply psi_lt_head;auto with T2. Qed.
imports: Coq(Arith List Lia Compare_dec Relations Wellfounded RelationClasses) hydras(Epsilon0) hydras(More_Arith Restriction) hydras(ON_Generic) hydras(rpo.term rpo.rpo) hydras(T2) hydras(Compat815)