proposition: Lemma gpaco2_unfold_bot clo (WCMP: wcompatible2 gf clo): gpaco2 gf clo bot2 bot2 <2= gf (gpaco2 gf clo bot2 bot2).
proof: Proof. intros. apply gpaco2_init in PR; [|apply WCMP]. _punfold PR; [..|apply gf_mon]. eapply gf_mon. apply PR. intros. destruct PR0; [|contradiction]. apply gpaco2_final. apply gf_mon. right. apply H. Qed.
imports: Program.Basics Paco(paco2 pacotac)