proposition: Corollary paco9_mult: forall r, paco9 gf (paco9 gf r) <9= paco9 gf r.
proof: Proof. intros; eapply paco9_mult_strong, paco9_mon; [apply PR|..]; intros; left; assumption. Qed.
imports: Program.Basics Paco(paconotation_internal paco_internal pacotac_internal)