proposition: Lemma length_n : forall a b r n p, n < p -> t2_length (gcons a b n r) < t2_length (gcons a b p r).
proof: Proof. induction 1. simpl. auto with arith. simpl;auto with arith. Qed.
imports: Coq(Arith Compare_dec Relations Wellfounded Lia) hydras(More_Arith Restriction T1 OrdNotations Compat815)