proposition: Lemma gpaco13_step_gen clo r rg: gf (gpaco13 clo (rg \13/ r) (rg \13/ r)) <13= gpaco13 clo r rg.
proof: Proof. intros. econstructor. apply rclo13_base. left. pstep. eapply gf_mon. apply PR. intros. destruct PR0. eapply rclo13_mon. apply IN. intros. destruct PR0. - left. eapply paco13_mon. apply H. intros. destruct PR0; apply H0. - right. apply H. Qed.
imports: Program.Basics Paco(paco13 pacotac)