proposition: Remark R2 : Acc P.prec ord_zero.
proof: Proof. split. destruct y; try contradiction; auto with rpo. Qed.
imports: Coq(Arith Lia Compare_dec Relations Wellfounded Wf_nat List Bool Eqdep_dec Ensembles ArithRing Logic) hydras(More_Arith Restriction DecPreOrder rpo.term rpo.rpo Epsilon0.T1)