proposition: Lemma gpaco0_unfold_bot clo (WCMP: wcompatible0 gf clo): gpaco0 gf clo bot0 bot0 <0= gf (gpaco0 gf clo bot0 bot0).
proof: Proof. intros. apply gpaco0_init in PR; [|apply WCMP]. _punfold PR; [..|apply gf_mon]. eapply gf_mon. apply PR. intros. destruct PR0; [|contradiction]. apply gpaco0_final. apply gf_mon. right. apply H. Qed.
imports: Program.Basics Paco(paco0 pacotac)