proposition: Lemma gpaco0_gen_guard clo r rg: gpaco0 clo r (rg \0/ r) <0= gpaco0 clo r rg.
proof: Proof. intros. destruct PR. econstructor. eapply rclo0_mon. apply IN. intros. destruct PR; [|right; apply H]. left. eapply paco0_mon_gen; intros. apply H. apply PR. destruct PR. apply H0. right. apply H0. Qed.
imports: Program.Basics Paco(paco0 pacotac)