proposition: Remark add_reduce1 : forall x1 x2 y : Z, x1 = x2 -> (y + x1 - 1)%Z = (y + x2 - 1)%Z.
proof: Proof. intros; omega. Qed.
imports: DistributedReferenceCounting.machine4.machine DistributedReferenceCounting.machine4.cardinal DistributedReferenceCounting.machine4.comm