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diff --git a/helm/software/matita/contribs/ng_assembly/common/nat_to_num.ma b/helm/software/matita/contribs/ng_assembly/common/nat_to_num.ma
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-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||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                  *)
-(*                                                                        *)
-(**************************************************************************)
-
-(* ********************************************************************** *)
-(*                          Progetto FreeScale                            *)
-(*                                                                        *)
-(*   Sviluppato da: Ing. Cosimo Oliboni, oliboni@cs.unibo.it              *)
-(*   Sviluppo: 2008-2010                                                  *)
-(*                                                                        *)
-(* ********************************************************************** *)
-
-include "common/nat.ma".
-include "num/word32.ma".
-
-(* ************************ *)
-(* NUMERI FINITI → NATURALI *)
-(* ************************ *)
-
-nlet rec nat_of_qu_aux n (r:rec_quatern n) on r ≝
- match r with
-  [ qu_O ⇒ O
-  | qu_S t n' ⇒ S (nat_of_qu_aux t n')
-  ].
-
-ndefinition nat_of_qu : quatern → nat ≝ λn.nat_of_qu_aux n (qu_to_recqu n).
-
-nlet rec nat_of_oct_aux n (r:rec_oct n) on r ≝
- match r with
-  [ oc_O ⇒ O
-  | oc_S t n' ⇒ S (nat_of_oct_aux t n')
-  ].
-
-ndefinition nat_of_oct : oct → nat ≝ λn.nat_of_oct_aux n (oct_to_recoct n).
-
-nlet rec nat_of_ex_aux n (r:rec_exadecim n) on r ≝
- match r with
-  [ ex_O ⇒ O
-  | ex_S t n' ⇒ S (nat_of_ex_aux t n')
-  ].
-
-ndefinition nat_of_ex : exadecim → nat ≝ λn.nat_of_ex_aux n (ex_to_recex n).
-
-nlet rec nat_of_bit_aux n (r:rec_bitrigesim n) on r ≝
- match r with
-  [ bi_O ⇒ O
-  | bi_S t n' ⇒ S (nat_of_bit_aux t n')
-  ].
-
-ndefinition nat_of_bit : bitrigesim → nat ≝ λn.nat_of_bit_aux n (bit_to_recbit n).
-
-nlet rec nat_of_b8_aux n (r:rec_byte8 n) on r ≝
- match r with
-  [ b8_O ⇒ O
-  | b8_S t n' ⇒ S (nat_of_b8_aux t n')
-  ].
-
-ndefinition nat_of_b8 : byte8 → nat ≝ λn:byte8.nat_of_b8_aux n (b8_to_recb8 n).
-
-nlet rec nat_of_w16_aux n (r:rec_word16 n) on r : nat ≝
- match r with
-  [ w16_O ⇒ O
-  | w16_S t n' ⇒ S (nat_of_w16_aux t n')
-  ].
-
-ndefinition nat_of_w16 : word16 → nat ≝ λn:word16.nat_of_w16_aux n (w16_to_recw16 n).
-
-ndefinition nat_of_w32 : word32 → nat ≝ λn:word32.(nat65536 * (nat_of_w16 (w32h n))) + (nat_of_w16 (w32l n)).