proposition: Lemma gpaco6_unfold_bot clo (WCMP: wcompatible6 gf clo): gpaco6 gf clo bot6 bot6 <6= gf (gpaco6 gf clo bot6 bot6).
proof: Proof. intros. apply gpaco6_init in PR; [|apply WCMP]. _punfold PR; [..|apply gf_mon]. eapply gf_mon. apply PR. intros. destruct PR0; [|contradiction]. apply gpaco6_final. apply gf_mon. right. apply H. Qed.
imports: Program.Basics Paco(paco6 pacotac)