proposition: Corollary paco3_mult: forall r, paco3 gf (paco3 gf r) <3= paco3 gf r.
proof: Proof. intros; eapply paco3_mult_strong, paco3_mon; [apply PR|..]; intros; left; assumption. Qed.
imports: Program.Basics Paco(paconotation_internal paco_internal pacotac_internal)