(* Some properties about [is_uns] and [is_sgn]. *)

(* Specifications: *)
Lemma is_uns_mon: forall n1 n2 i, is_uns n1 i -> n1 <= n2 -> is_uns n2 i.
Lemma is_sgn_mon: forall n1 n2 i, is_sgn n1 i -> n1 <= n2 -> is_sgn n2 i.
Lemma is_uns_sgn: forall n1 n2 i, is_uns n1 i -> n1 < n2 -> is_sgn n2 i.
Definition usize := Int.size.