proposition: Lemma tricho_lt_7 : forall a1 b1 n1 c1 c2, t2_length c1 + t2_length c2 < t2_length (gcons a1 b1 n1 c1) + t2_length (gcons a1 b1 n1 c2).
proof: Proof. intros; apply Nat.add_lt_mono; apply length_c. 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)