--- /dev/null
+(**************************************************************************)
+(* ___ *)
+(* ||M|| *)
+(* ||A|| A project by Andrea Asperti *)
+(* ||T|| *)
+(* ||I|| Developers: *)
+(* ||T|| The HELM team. *)
+(* ||A|| http://helm.cs.unibo.it *)
+(* \ / *)
+(* \ / This file is distributed under the terms of the *)
+(* v GNU General Public License Version 2 *)
+(* *)
+(**************************************************************************)
+
+include "dama/models/nat_uniform.ma".
+include "dama/bishop_set_rewrite.ma".
+include "dama/ordered_uniform.ma".
+
+definition nat_ordered_uniform_space:ordered_uniform_space.
+ apply (mk_ordered_uniform_space (mk_ordered_uniform_space_ ℕ ℕ (refl_eq ? ℕ)));
+simplify; intros 10; cases H (_); cases (H7 y); apply H8; cases (H7 s);
+lapply (H11 H1) as H13; apply (le_le_eq);
+[2: apply (le_transitive ??? H5); apply (Le≪ ? H13); assumption;
+|1: assumption;
+|3: change with (le (os_r ℕ) (\snd y) (\fst y));
+ apply (ge_transitive ??? H5);apply (ge_transitive ???? H4);
+ change with (le (os_l ℕ) (\fst s) (\snd s));
+ apply (Le≫ ? H13); apply le_reflexive;
+|4: assumption;]
+qed.
+
+interpretation "Ordered uniform space N" 'N = nat_ordered_uniform_space.