proposition: Lemma gpaco13_gen_guard clo r rg: gpaco13 clo r (rg \13/ r) <13= gpaco13 clo r rg.
proof: Proof. intros. destruct PR. econstructor. eapply rclo13_mon. apply IN. intros. destruct PR; [|right; apply H]. left. eapply paco13_mon_gen; intros. apply H. apply PR. destruct PR. apply H0. right. apply H0. Qed.
imports: Program.Basics Paco(paco13 pacotac)