proposition: Lemma gpaco13_unfold_bot clo (WCMP: wcompatible13 gf clo): gpaco13 gf clo bot13 bot13 <13= gf (gpaco13 gf clo bot13 bot13).
proof: Proof. intros. apply gpaco13_init in PR; [|apply WCMP]. _punfold PR; [..|apply gf_mon]. eapply gf_mon. apply PR. intros. destruct PR0; [|contradiction]. apply gpaco13_final. apply gf_mon. right. apply H. Qed.
imports: Program.Basics Paco(paco13 pacotac)