proposition: Lemma D_post_dec : D_queue (Post_message Message dec b0 s0 owner s0 owner).
proof: Proof. intros; rewrite post_here; apply D_dec; trivial. Qed.
imports: DistributedReferenceCounting.machine2.machine DistributedReferenceCounting.machine2.cardinal DistributedReferenceCounting.machine2.comm