proposition: Lemma gpaco3_unfold clo r rg: gpaco3 clo r rg <3= rclo3 clo (gf (gupaco3 clo (rg \3/ r)) \3/ r).
proof: Proof. intros. destruct PR. eapply rclo3_mon. apply IN. intros. destruct PR; cycle 1. right; apply H. left. _punfold H; [|apply gpaco3_def_mon]. eapply gf_mon. apply H. intros. econstructor. eapply rclo3_mon. apply PR. intros. destruct PR0; cycle 1. right. apply H0. left. eapply paco3_mon. apply H0. intros. left. apply PR0. Qed.
imports: Program.Basics Paco(paco3 pacotac)