X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Flib%2Fturing%2Fmulti_universal%2Fcopy.ma;h=1fef8d0b011eafc04357c848f253613d2d01b1df;hb=77bf99a9ac05a61573d621d576e269870668f076;hp=e4931202652279a6abe6745086cf2b99444d1508;hpb=d036ed7ebc9b6ecdefc773b0913980066cc778a2;p=helm.git

diff --git a/matita/matita/lib/turing/multi_universal/copy.ma b/matita/matita/lib/turing/multi_universal/copy.ma
index e49312026..1fef8d0b0 100644
--- a/matita/matita/lib/turing/multi_universal/copy.ma
+++ b/matita/matita/lib/turing/multi_universal/copy.ma
@@ -107,23 +107,6 @@ whd in ⊢ (??%?); >(eq_pair_fst_snd … (trans ????)) whd in ⊢ (??%?); @eq_f2
 ]
 qed.
 
-lemma change_vec_commute : ∀A,n,v,a,b,i,j. i ≠ j → 
-  change_vec A n (change_vec A n v a i) b j
-  = change_vec A n (change_vec A n v b j) a i.
-#A #n #v #a #b #i #j #Hij @(eq_vec … a)
-#k #Hk cases (decidable_eq_nat k i) #Hki
-[ >Hki >nth_change_vec // >(nth_change_vec_neq ??????? (sym_not_eq … Hij))
-  >nth_change_vec //
-| cases (decidable_eq_nat k j) #Hkj
-  [ >Hkj >nth_change_vec // >(nth_change_vec_neq ??????? Hij) >nth_change_vec //
-  | >(nth_change_vec_neq ??????? (sym_not_eq … Hki))
-    >(nth_change_vec_neq ??????? (sym_not_eq … Hkj))
-    >(nth_change_vec_neq ??????? (sym_not_eq … Hki))
-    >(nth_change_vec_neq ??????? (sym_not_eq … Hkj)) //
-  ]
-]
-qed.
-
 lemma copy_q0_q1 :
   ∀src,dst,sig,n,is_sep,v,t.src ≠ dst → src < S n → dst < S n → 
   ∀s.current ? t = Some ? s → is_sep s = false → 
@@ -191,21 +174,12 @@ definition R_copy ≝
    outt = int) ∧
   (current ? (nth src ? int (niltape ?)) = None ? → outt = int).
   
-lemma change_vec_change_vec : ∀A,n,v,a,b,i. 
-  change_vec A n (change_vec A n v a i) b i = change_vec A n v b i.
-#A #n #v #a #b #i @(eq_vec … a) #i0 #Hi0
-cases (decidable_eq_nat i i0) #Hii0
-[ >Hii0 >nth_change_vec // >nth_change_vec //
-| >nth_change_vec_neq // >nth_change_vec_neq //
-  >nth_change_vec_neq // ]
-qed.
-
 lemma wsem_copy : ∀src,dst,sig,n,is_sep.src ≠ dst → src < S n → dst < S n → 
   copy src dst sig n is_sep ⊫ R_copy src dst sig n is_sep.
 #src #dst #sig #n #is_sep #Hneq #Hsrc #Hdst #ta #k #outc #Hloop
 lapply (sem_while … (sem_copy_step src dst sig n is_sep Hneq Hsrc Hdst) … Hloop) //
--Hloop * #tb * #Hstar @(star_ind_l ??????? Hstar) -Hstar
-[ #tc whd in ⊢ (%→?); *
+-Hloop * #tb * #Hstar @(star_ind_l ??????? Hstar) -Hstar -ta
+[ whd in ⊢ (%→?); *
   [ * #x * * #Hx #Hsep #Houtc % [ %
     [ #ls #x0 #xs #rs #sep #Hsrctc #Hnosep >Hsrctc in Hx; normalize in ⊢ (%→?);
       #Hx0 destruct (Hx0) lapply (Hnosep ? (memb_hd …)) >Hsep
@@ -218,15 +192,15 @@ lapply (sem_while … (sem_copy_step src dst sig n is_sep Hneq Hsrc Hdst) … Hl
     | #c #Hc #Hsepc @Houtc ]
     | #_ @Houtc ]
   ]
-| #tc #td #te * #c0 * * #Hc0 #Hc0nosep #Hd #Hstar #IH #He 
+| #td #te * #c0 * * #Hc0 #Hc0nosep #Hd #Hstar #IH #He 
   lapply (IH He) -IH * * #IH1 #IH2 #IH3 % [ %
   [ #ls #x #xs #rs #sep #Hsrc_tc #Hnosep #Hsep #ls0 #x0 #target
     #c #rs0 #Hlen #Hdst_tc
     >Hsrc_tc in Hc0; normalize in ⊢ (%→?); #Hc0 destruct (Hc0)
-    <(change_vec_same … tc src (niltape ?)) in Hd:(???(???(???%??)??));
-    <(change_vec_same … tc dst (niltape ?)) in ⊢(???(???(???%??)??)→?);
-    >Hdst_tc >Hsrc_tc >change_vec_change_vec >change_vec_change_vec
-    >(change_vec_commute ?? tc ?? dst src) [|@(sym_not_eq … Hneq)]
+    <(change_vec_same … td src (niltape ?)) in Hd:(???(???(???%??)??));
+    <(change_vec_same … td dst (niltape ?)) in ⊢(???(???(???%??)??)→?);
+    >Hdst_tc >Hsrc_tc >(change_vec_change_vec ?) >change_vec_change_vec
+    >(change_vec_commute ?? td ?? dst src) [|@(sym_not_eq … Hneq)]
     >change_vec_change_vec @(list_cases2 … Hlen)
     [ #Hxsnil #Htargetnil #Hd>(IH2 … Hsep)
       [ >Hd -Hd >Hxsnil >Htargetnil @(eq_vec … (niltape ?))
@@ -247,9 +221,9 @@ lapply (sem_while … (sem_copy_step src dst sig n is_sep Hneq Hsrc Hdst) … Hl
         >nth_change_vec // >nth_change_vec // >Hxsnil % ]
     |#hd1 #hd2 #tl1 #tl2 #Hxs #Htarget >Hxs >Htarget #Hd
      >(IH1 (c0::ls) hd1 tl1 rs sep ?? Hsep (c0::ls0) hd2 tl2 c rs0)
-     [ >Hd >(change_vec_commute … ?? tc ?? src dst) //
+     [ >Hd >(change_vec_commute … ?? td ?? src dst) //
        >change_vec_change_vec
-       >(change_vec_commute … ?? tc ?? dst src) [|@sym_not_eq //]
+       >(change_vec_commute … ?? td ?? dst src) [|@sym_not_eq //]
        >change_vec_change_vec
        >reverse_cons >associative_append >associative_append % 
      | >Hd >nth_change_vec // >nth_change_vec_neq // >Hdst_tc >Htarget //
@@ -283,4 +257,10 @@ cases (nth src (tape sig) t (niltape ?))
    >change_vec_change_vec >change_vec_commute // #Ht1 >Ht1 @IH
   ]
 ]
+qed.
+
+lemma sem_copy : ∀src,dst,sig,n,is_sep.
+  src ≠ dst → src < S n → dst < S n → 
+  copy src dst sig n is_sep ⊨ R_copy src dst sig n is_sep.
+#src #dst #sig #n #is_sep #Hneq #Hsrc #Hdst @WRealize_to_Realize /2/
 qed.
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