proposition: Lemma gpaco13_dist_reverse clo r rg: (paco13 gf (rclo13 clo (rg \13/ r)) \13/ rclo13 clo r) <13= gpaco13 gf clo r rg.
proof: Proof. intros. destruct PR; cycle 1. - eapply gpaco13_rclo. apply H. - econstructor. apply rclo13_base. left. revert x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 H. pcofix CIH; intros. _punfold H0; [|apply gf_mon]. pstep. eapply gf_mon. apply H0. intros. destruct PR. + apply rclo13_base. right. apply CIH, H. + eapply rclo13_mon. apply H. intros. right. apply CIH0. apply PR. Qed.
imports: Program.Basics Paco(paco13 pacotac)