proposition: Lemma gpaco9_dist_reverse clo r rg: (paco9 gf (rclo9 clo (rg \9/ r)) \9/ rclo9 clo r) <9= gpaco9 gf clo r rg.
proof: Proof. intros. destruct PR; cycle 1. - eapply gpaco9_rclo. apply H. - econstructor. apply rclo9_base. left. revert x0 x1 x2 x3 x4 x5 x6 x7 x8 H. pcofix CIH; intros. _punfold H0; [|apply gf_mon]. pstep. eapply gf_mon. apply H0. intros. destruct PR. + apply rclo9_base. right. apply CIH, H. + eapply rclo9_mon. apply H. intros. right. apply CIH0. apply PR. Qed.
imports: Program.Basics Paco(paco9 pacotac)