proposition: Lemma gpaco6_unfold clo r rg: gpaco6 clo r rg <6= rclo6 clo (gf (gupaco6 clo (rg \6/ r)) \6/ r).
proof: Proof. intros. destruct PR. eapply rclo6_mon. apply IN. intros. destruct PR; cycle 1. right; apply H. left. _punfold H; [|apply gpaco6_def_mon]. eapply gf_mon. apply H. intros. econstructor. eapply rclo6_mon. apply PR. intros. destruct PR0; cycle 1. right. apply H0. left. eapply paco6_mon. apply H0. intros. left. apply PR0. Qed.
imports: Program.Basics Paco(paco6 pacotac)