proposition: Lemma gpaco0_unfold clo r rg: gpaco0 clo r rg <0= rclo0 clo (gf (gupaco0 clo (rg \0/ r)) \0/ r).
proof: Proof. intros. destruct PR. eapply rclo0_mon. apply IN. intros. destruct PR; cycle 1. right; apply H. left. _punfold H; [|apply gpaco0_def_mon]. eapply gf_mon. apply H. intros. econstructor. eapply rclo0_mon. apply PR. intros. destruct PR0; cycle 1. right. apply H0. left. eapply paco0_mon. apply H0. intros. left. apply PR0. Qed.
imports: Program.Basics Paco(paco0 pacotac)