proposition: Corollary paco6_mult: forall r, paco6 gf (paco6 gf r) <6= paco6 gf r.
proof: Proof. intros; eapply paco6_mult_strong, paco6_mon; [apply PR|..]; intros; left; assumption. Qed.
imports: Program.Basics Paco(paconotation_internal paco_internal pacotac_internal)