proposition: Theorem _paco3_mult_strong: forall r, paco3 gf (upaco3 gf r) <3== paco3 gf r.
proof: Proof. intros. apply curry_map3. eapply le1_trans; [| eapply _paco_mult_strong]. apply _paco_mon; intros [] H; apply H. Qed.
imports: Program.Basics Paco(paconotation_internal paco_internal pacotac_internal)