proposition: Lemma gpaco9_step_gen clo r rg: gf (gpaco9 clo (rg \9/ r) (rg \9/ r)) <9= gpaco9 clo r rg.
proof: Proof. intros. econstructor. apply rclo9_base. left. pstep. eapply gf_mon. apply PR. intros. destruct PR0. eapply rclo9_mon. apply IN. intros. destruct PR0. - left. eapply paco9_mon. apply H. intros. destruct PR0; apply H0. - right. apply H. Qed.
imports: Program.Basics Paco(paco9 pacotac)