proposition: Lemma gpaco5_unfold clo r rg: gpaco5 clo r rg <5= rclo5 clo (gf (gupaco5 clo (rg \5/ r)) \5/ r).
proof: Proof. intros. destruct PR. eapply rclo5_mon. apply IN. intros. destruct PR; cycle 1. right; apply H. left. _punfold H; [|apply gpaco5_def_mon]. eapply gf_mon. apply H. intros. econstructor. eapply rclo5_mon. apply PR. intros. destruct PR0; cycle 1. right. apply H0. left. eapply paco5_mon. apply H0. intros. left. apply PR0. Qed.
imports: Program.Basics Paco(paco5 pacotac)