X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Fcontribs%2Fng_assembly%2Fnum%2Fexadecim_lemmas.ma;h=47847434eb909921c312e8f7c383433cfa530972;hb=5450fa91891df49587fedff6edd6179cf1bbc879;hp=a556b2d9e6b8863583b1fa3ca933562ab15868ec;hpb=d3c72253769956a8af10e6ea990ed34c92999e58;p=helm.git

diff --git a/helm/software/matita/contribs/ng_assembly/num/exadecim_lemmas.ma b/helm/software/matita/contribs/ng_assembly/num/exadecim_lemmas.ma
index a556b2d9e..47847434e 100755
--- a/helm/software/matita/contribs/ng_assembly/num/exadecim_lemmas.ma
+++ b/helm/software/matita/contribs/ng_assembly/num/exadecim_lemmas.ma
@@ -15,8 +15,8 @@
 (* ********************************************************************** *)
 (*                          Progetto FreeScale                            *)
 (*                                                                        *)
-(*   Sviluppato da: Cosimo Oliboni, oliboni@cs.unibo.it                   *)
-(*     Cosimo Oliboni, oliboni@cs.unibo.it                                *)
+(*   Sviluppato da: Ing. Cosimo Oliboni, oliboni@cs.unibo.it              *)
+(*   Ultima modifica: 05/08/2009                                          *)
 (*                                                                        *)
 (* ********************************************************************** *)
 
@@ -462,10 +462,20 @@ nlemma eq_to_eqex : ∀e1,e2.e1 = e2 → eq_ex e1 e2 = true.
  ##]
 nqed.
 
+nlemma decidable_ex : ∀x,y:exadecim.decidable (x = y).
+ #x; #y;
+ nnormalize;
+ nelim x;
+ nelim y;
+ ##[ ##1,18,35,52,69,86,103,120,137,154,171,188,205,222,239,256: napply (or_introl (? = ?) (? ≠ ?) …); napply refl_eq
+ ##| ##*: napply (or_intror (? = ?) (? ≠ ?) …); nnormalize; #H; napply False_ind; napply (exadecim_destruct … H)
+ ##]
+nqed.
+
 nlemma neqex_to_neq : ∀e1,e2:exadecim.(eq_ex e1 e2 = false) → (e1 ≠ e2).
- #e1; #e2;
- ncases e1;
- ncases e2;
+ #n1; #n2;
+ ncases n1;
+ ncases n2;
  nnormalize;
  ##[ ##1,18,35,52,69,86,103,120,137,154,171,188,205,222,239,256: #H; napply (bool_destruct … H)
  ##| ##*: #H; #H1; napply (exadecim_destruct … H1)
@@ -473,11 +483,11 @@ nlemma neqex_to_neq : ∀e1,e2:exadecim.(eq_ex e1 e2 = false) → (e1 ≠ e2).
 nqed.
 
 nlemma neq_to_neqex : ∀e1,e2.e1 ≠ e2 → eq_ex e1 e2 = false.
- #e1; #e2;
- ncases e1;
- ncases e2;
+ #n1; #n2;
+ ncases n1;
+ ncases n2;
  nnormalize;
- ##[ ##1,18,35,52,69,86,103,120,137,154,171,188,205,222,239,256: #H; napply False_ind; napply (H (refl_eq …))
+ ##[ ##1,18,35,52,69,86,103,120,137,154,171,188,205,222,239,256: #H; nelim (H (refl_eq …))
  ##| ##*: #H; napply refl_eq
  ##]
 nqed.