proposition: Lemma gpaco2_unfold clo r rg: gpaco2 clo r rg <2= rclo2 clo (gf (gupaco2 clo (rg \2/ r)) \2/ r).
proof: Proof. intros. destruct PR. eapply rclo2_mon. apply IN. intros. destruct PR; cycle 1. right; apply H. left. _punfold H; [|apply gpaco2_def_mon]. eapply gf_mon. apply H. intros. econstructor. eapply rclo2_mon. apply PR. intros. destruct PR0; cycle 1. right. apply H0. left. eapply paco2_mon. apply H0. intros. left. apply PR0. Qed.
imports: Program.Basics Paco(paco2 pacotac)