proposition: Corollary paco1_mult: forall r, paco1 gf (paco1 gf r) <1= paco1 gf r.
proof: Proof. intros; eapply paco1_mult_strong, paco1_mon; [apply PR|..]; intros; left; assumption. Qed.
imports: Program.Basics Paco(paconotation_internal paco_internal pacotac_internal)