proposition: Lemma gpaco9_unfold_bot clo (WCMP: wcompatible9 gf clo): gpaco9 gf clo bot9 bot9 <9= gf (gpaco9 gf clo bot9 bot9).
proof: Proof. intros. apply gpaco9_init in PR; [|apply WCMP]. _punfold PR; [..|apply gf_mon]. eapply gf_mon. apply PR. intros. destruct PR0; [|contradiction]. apply gpaco9_final. apply gf_mon. right. apply H. Qed.
imports: Program.Basics Paco(paco9 pacotac)