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diff --git a/helm/ocaml/cic_disambiguation/number_notation.ml b/helm/ocaml/cic_disambiguation/number_notation.ml
new file mode 100644
index 000000000..2b3ce2d60
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+++ b/helm/ocaml/cic_disambiguation/number_notation.ml
@@ -0,0 +1,55 @@
+(* Copyright (C) 2004, HELM Team.
+ * 
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ * 
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ * 
+ * For details, see the HELM World-Wide-Web page,
+ * http://helm.cs.unibo.it/
+ *)
+
+(* $Id$ *)
+
+let _ =
+  DisambiguateChoices.add_num_choice
+    ("natural number",
+      (fun _ num _ -> HelmLibraryObjects.build_nat (int_of_string num)));
+  DisambiguateChoices.add_num_choice
+    ("real number",
+      (fun _ num _ -> HelmLibraryObjects.build_real (int_of_string num)));
+  DisambiguateChoices.add_num_choice
+    ("binary positive number",
+      (fun _ num _ ->
+        let num = int_of_string num in
+        if num = 0 then
+          raise (DisambiguateTypes.Invalid_choice (lazy "0 is not a valid positive number"))
+        else
+          HelmLibraryObjects.build_bin_pos num));
+  DisambiguateChoices.add_num_choice
+    ("binary integer number",
+      (fun _ num _ ->
+        let num = int_of_string num in
+        if num = 0 then
+          HelmLibraryObjects.BinInt.z0
+        else if num > 0 then
+          Cic.Appl [
+            HelmLibraryObjects.BinInt.zpos;
+            HelmLibraryObjects.build_bin_pos num ]
+        else
+          assert false))
+