X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=sidebyside;f=matita%2Fmatita%2Flib%2Fturing%2Finject.ma;h=6290a2919afefd2bf315badfc47bec0a6afbf9fb;hb=2b2507630ff50a8d00ecee7873e9e4d1eb24f171;hp=0e9ffe09050f189530c2755c29a91e7ad1684506;hpb=b31ab31a99065295b91003a0df95dec817cee5de;p=helm.git

diff --git a/matita/matita/lib/turing/inject.ma b/matita/matita/lib/turing/inject.ma
index 0e9ffe090..6290a2919 100644
--- a/matita/matita/lib/turing/inject.ma
+++ b/matita/matita/lib/turing/inject.ma
@@ -10,8 +10,10 @@
       V_____________________________________________________________*)
 
 include "turing/turing.ma".
+(* include "turing/basic_machines.ma". *)
 
 (******************* inject a mono machine into a multi tape one **********************)
+
 definition inject_trans ≝ λsig,states:FinSet.λn,i:nat.
   λtrans:states × (option sig) → states  × (option sig × move).
   λp:states × (Vector (option sig) (S n)).
@@ -30,9 +32,16 @@ lapply (trans sig M)  #trans #x lapply (trans x) * *
 #s #a #m % [ @s | % [ @a | @m ] ]
 qed.
 
-axiom current_chars_change_vec: ∀sig,n,v,a,i. i < S n →
+lemma current_chars_change_vec: ∀sig,n,v,a,i. i < S n →
    current_chars sig ? (change_vec ? (S n) v a i) =
    change_vec ? (S n)(current_chars ?? v) (current ? a) i.
+#sig #n #v #a #i #Hi @(eq_vec … (None ?)) #i0 #Hi0
+change with (vec_map ?????) in match (current_chars ???);
+<(nth_vec_map … (niltape ?))
+cases (decidable_eq_nat i i0) #Hii0
+[ >Hii0 >nth_change_vec // >nth_change_vec //
+| >nth_change_vec_neq // >nth_change_vec_neq // @nth_vec_map ]
+qed.
 
 lemma inject_trans_def :∀sig:FinSet.∀n,i:nat.i < S n → 
   ∀M,v,s,a,sn,an,mn.
@@ -103,35 +112,11 @@ lemma loop_inject: ∀sig,n,M,i,k,ins,int,outs,outt,vt.i < S n →
   ]
 qed.
 
-(*
-lemma cstate_inject: ∀sig,n,M,i,x. *)
-
 definition inject_R ≝ λsig.λR:relation (tape sig).λn,i:nat.
   λv1,v2: (Vector (tape sig) (S n)).
   R (nth i ? v1 (niltape ?)) (nth i ? v2 (niltape ?)) ∧
   ∀j. i ≠ j → nth j ? v1 (niltape ?) = nth j ? v2 (niltape ?). 
 
-(*
-lemma nth_make : ∀A,i,n,j,a,d. i < n → nth i ? (make_veci A a n j) d = a (j+i).
-#A #i elim i
-  [#n #j #a #d #ltOn @(lt_O_n_elim … ltOn) <plus_n_O //
-  |#m #Hind #n #j #a #d #Hlt lapply Hlt @(lt_O_n_elim … (ltn_to_ltO … Hlt)) 
-   #p <plus_n_Sm #ltmp @Hind @le_S_S_to_le //  
-  ]
-qed. *)
-
-(*
-lemma mk_config_eq_s: ∀S,sig,s1,s2,t1,t2. 
-  mk_config S sig s1 t1 = mk_config S sig s2 t2 → s1=s2.
-#S #sig #s1 #s2 #t1 #t2 #H destruct //
-qed.
-
-lemma mk_config_eq_t: ∀S,sig,s1,s2,t1,t2. 
-  mk_config S sig s1 t1 = mk_config S sig s2 t2 → s1=s2.
-#S #sig #s1 #s2 #t1 #t2 #H destruct //
-qed.
-*)
-
 theorem sem_inject: ∀sig.∀M:TM sig.∀R.∀n,i.
  i≤n → M ⊨ R → inject_TM sig M n i ⊨ inject_R sig R n i. 
 #sig #M #R #n #i #lein #HR #vt cases (HR (nth i ? vt (niltape ?)))