#alpha #a #al %
qed.
-axiom daemon : ∀P:Prop.P.
-
definition option_cons ≝ λsig.λc:option sig.λl.
match c with [ None ⇒ l | Some c0 ⇒ c0::l ].
normalize //
qed.
+lemma eq_vec_change_vec : ∀sig,n.∀v1,v2:Vector sig n.∀i,t,d.
+ nth i ? v2 d = t →
+ (∀j.i ≠ j → nth j ? v1 d = nth j ? v2 d) →
+ v2 = change_vec ?? v1 t i.
+#sig #n #v1 #v2 #i #t #d #H1 #H2 @(eq_vec … d)
+#i0 #Hlt cases (decidable_eq_nat i0 i) #Hii0
+[ >Hii0 >nth_change_vec //
+| >nth_change_vec_neq [|@sym_not_eq //] @sym_eq @H2 @sym_not_eq // ]
+qed.
+
lemma sem_obj_to_cfg : obj_to_cfg ⊨ R_obj_to_cfg.
@(sem_seq_app FSUnialpha 2 ????? (sem_move_multi ? 2 cfg L ?)
(sem_seq ??????
[ #lso #x0 #rso #Hta2 >Hta1 in Htc; >eq_mk_tape_rightof
whd in match (tape_move ???); #Htc
cut (tg = change_vec ?? td (mk_tape ? [ ] (None ?) (reverse ? ls@[x])) cfg)
- [@daemon] -Htg1 -Htg2 -Htg3 #Htg destruct (Htg Htf Hte Htd Htc Htb)
+ [ lapply (eq_vec_change_vec ??????? (Htg2 ls x [ ] ?) Htg3) //
+ >Htd >nth_change_vec_neq // >Htf >nth_change_vec //
+ >Hte >nth_change_vec // >Htc >nth_change_vec // ] -Htg1 -Htg2 -Htg3 #Htg
+ destruct
>change_vec_change_vec >change_vec_change_vec
>change_vec_commute // >change_vec_change_vec
>change_vec_commute [|@sym_not_eq //] >change_vec_change_vec
>Hta2 normalize in ⊢ (%→?); #H destruct (H)
| #_ >Hta1 in Htc; >eq_mk_tape_rightof whd in match (tape_move ???); #Htc
destruct (Hte) cut (td = change_vec ?? tc (midtape ? ls null []) cfg)
- [@daemon] -Htd1 -Htd2 #Htd
+ [ lapply (eq_vec_change_vec ??????? (Htd1 ls c [ ] ?) Htd2) //
+ >Htc >nth_change_vec // ] -Htd1 -Htd2 #Htd
-Htf1 cut (tf = change_vec ?? td (mk_tape ? [ ] (None ?) (reverse ? ls@[null])) cfg)
- [@daemon] -Htf2 -Htf3 #Htf destruct (Htf Htd Htc Htb)
+ [ lapply (eq_vec_change_vec ??????? (Htf2 ls null [ ] ?) Htf3) //
+ >Htd >nth_change_vec // ] -Htf2 -Htf3 #Htf destruct (Htf Htd Htc Htb)
>change_vec_change_vec >change_vec_change_vec >change_vec_change_vec
>change_vec_change_vec >change_vec_change_vec >nth_change_vec //
>reverse_cons >tape_move_mk_tape_R /2/ ]
(change_vec ?? t1
(midtape ? (left ? (nth obj ? t1 (niltape ?))) c (right ? (nth obj ? t1 (niltape ?)))) obj)
(mk_tape ? [ ] (option_hd ? (reverse ? (c::ls))) (tail ? (reverse ? (c::ls)))) cfg).
+
+lemma tape_move_mk_tape_L :
+ ∀sig,ls,c,rs.
+ (c = None ? → ls = [ ] ∨ rs = [ ]) →
+ tape_move ? (mk_tape sig ls c rs) L =
+ mk_tape ? (tail ? ls) (option_hd ? ls) (option_cons ? c rs).
+#sig * [ * [ * | #c * ] | #l0 #ls0 * [ *
+[| #r0 #rs0 #H @False_ind cases (H (refl ??)) #H1 destruct (H1) ] | #c * ] ]
+normalize //
+qed.
lemma sem_cfg_to_obj : cfg_to_obj ⊨ R_cfg_to_obj.
@(sem_seq_app FSUnialpha 2 ????? (sem_move_multi ? 2 cfg L ?)
whd in ⊢ (%→?); #Htb
#c #ls #Hta %
[ #Hc >Hta in Htc; >eq_mk_tape_rightof whd in match (tape_move ???); #Htc
- cut (te = tc) [@daemon] -Hte1 -Hte2 #Hte
+ cut (te = tc)
+ [ lapply (eq_vec_change_vec ??????? (sym_eq … Hte1) Hte2) >change_vec_same // ]
+ -Hte1 -Hte2 #Hte
cut (tf = change_vec ? 3 te (mk_tape ? [ ] (None ?) (reverse ? ls@[c])) cfg)
- [@daemon] -Htf1 -Htf2 -Htf3 #Htf
+ [ lapply (eq_vec_change_vec ??????? (Htf2 ls c [ ] ?) Htf3) //
+ >Hte >Htc >nth_change_vec // ] -Htf1 -Htf2 -Htf3 #Htf
destruct (Htf Hte Htc Htb)
>change_vec_change_vec >change_vec_change_vec >change_vec_change_vec
>nth_change_vec // >tape_move_mk_tape_R [| #_ % % ]
* #th * * * #Hth1 #Hth2 #Hth3
whd in ⊢ (%→?); #Htb
#c #ls #Hta % #Hc
- [ cut (te = tc) [ @daemon ] -Hte1 -Hte2 #Hte
+ [ >Htc in Hcurtc; >Hta >nth_change_vec // >tape_move_mk_tape_L //
+ >Hc normalize in ⊢ (%→?); * #H @False_ind /2/
+ | cut (te = tc)
+ [ lapply (eq_vec_change_vec ??????? (sym_eq … Hte1) Hte2)
+ >change_vec_same // ] -Hte1 -Hte2 #Hte
cut (th = change_vec ?? td (mk_tape ? [ ] (None ?) (reverse ? ls@[c])) cfg)
- [@daemon] -Hth1 -Hth2 -Hth3 #Hth
- destruct (Hth Hte Hta Htb Htd Htg Htc Htf)
+ [ lapply (eq_vec_change_vec ??????? (Hth2 ls c [ ] ?) Hth3) //
+ >Htd >nth_change_vec_neq // >Htg >nth_change_vec //
+ >Htf >nth_change_vec_neq // >nth_change_vec //
+ >Hte >Htc >nth_change_vec // >Hta // ] -Hth1 -Hth2 -Hth3 #Hth
+ destruct (Hth Hte Hta Htb Htd Htg Htc Htf)
>change_vec_change_vec >change_vec_change_vec
>change_vec_commute // >change_vec_change_vec
>change_vec_commute [|@sym_not_eq //] >change_vec_change_vec
>nth_change_vec // >nth_change_vec_neq [|@sym_not_eq //]
>change_vec_commute [|@sym_not_eq //]
@eq_f3 //
- [ >Hta2 cases rso in Hta2; whd in match (tape_move_mono ???);
- [ #Hta2 whd in match (tape_move ???); <Hta2 @change_vec_same
- | #r1 #rs1 #Hta2 whd in match (tape_move ???); <Hta2 @change_vec_same ]
- | >tape_move_mk_tape_R [| #_ % %] >reverse_cons
- >nth_change_vec_neq in Hcurtc1; [|@sym_not_eq //] >Hta2
- normalize in ⊢ (%→?); #H destruct (H) %
- ]
-
- #c #ls #Hta % #Hc
- [ >Hta in Htc; >eq_mk_tape_rightof whd in match (tape_move ???); #Htc
- >Htc in Hcurtc; >nth_change_vec // normalize in ⊢ (%→?); >Hc
- * #H @False_ind /2/
- | >Hta in Htc; >eq_mk_tape_rightof whd in match (tape_move ???); #Htc
- cut (te = tc) [@daemon] -Hte1 -Hte2 #Hte
+ [ >Hta >tape_move_mk_tape_L // >nth_change_vec // whd in match (current ??);
+ @eq_f2 // cases (nth obj ? ta (niltape ?))
+ [| #r0 #rs0 | #l0 #ls0 | #ls0 #c0 #rs0 ] try %
+ cases rs0 //
+ | >reverse_cons >tape_move_mk_tape_R // #_ % % ]
+ ]
+]
qed.
-*)
(* macchina che muove il nastro obj a destra o sinistra a seconda del valore
del current di prg, che codifica la direzione in cui ci muoviamo *)
tc_true)
tc_true.
+definition R_tape_move_obj' ≝ λt1,t2:Vector (tape FSUnialpha) 3.
+ (current ? (nth prg ? t1 (niltape ?)) = Some ? (bit false) →
+ t2 = change_vec ?? t1 (tape_move ? (nth obj ? t1 (niltape ?)) L) obj) ∧
+ (current ? (nth prg ? t1 (niltape ?)) = Some ? (bit true) →
+ t2 = change_vec ?? t1 (tape_move ? (nth obj ? t1 (niltape ?)) R) obj) ∧
+ (current ? (nth prg ? t1 (niltape ?)) ≠ Some ? (bit false) →
+ current ? (nth prg ? t1 (niltape ?)) ≠ Some ? (bit true) →
+ t2 = t1).
+
+lemma sem_tape_move_obj' : tape_move_obj ⊨ R_tape_move_obj'.
+#ta cases (sem_if ??????????
+ (acc_sem_inject ?????? prg ? (sem_test_char ? (λc:FSUnialpha.c == bit false)))
+ (sem_move_multi ? 2 obj L ?)
+ (sem_if ??????????
+ (acc_sem_inject ?????? prg ? (sem_test_char ? (λc:FSUnialpha.c == bit true)))
+ (sem_move_multi ? 2 obj R ?)
+ (sem_nop …)) ta) //
+#i * #outc * #Hloop #HR %{i} %{outc} % [@Hloop] -i
+cases HR -HR
+[ * #tb * * * * #c * #Hcurta_prg #Hc lapply (\P Hc) -Hc #Hc #Htb1 #Htb2
+ whd in ⊢ (%→%); #Houtc >Houtc -Houtc % [ %
+ [ >Hcurta_prg #H destruct (H) >(?:tb = ta)
+ [| lapply (eq_vec_change_vec ??????? Htb1 Htb2)
+ >change_vec_same // ] %
+ | >Hcurta_prg #H destruct (H) destruct (Hc) ]
+ | >Hcurta_prg >Hc * #H @False_ind /2/ ]
+| * #tb * * * #Hnotfalse #Htb1 #Htb2 cut (tb = ta)
+ [ lapply (eq_vec_change_vec ??????? Htb1 Htb2)
+ >change_vec_same // ] -Htb1 -Htb2 #Htb destruct (Htb) *
+ [ * #tc * * * * #c * #Hcurta_prg #Hc lapply (\P Hc) -Hc #Hc #Htc1 #Htc2
+ whd in ⊢ (%→%); #Houtc >Houtc -Houtc % [ %
+ [ >Hcurta_prg #H destruct (H) destruct (Hc)
+ | >Hcurta_prg #H destruct (H) >(?:tc = ta)
+ [| lapply (eq_vec_change_vec ??????? Htc1 Htc2)
+ >change_vec_same // ] % ]
+ | >Hcurta_prg >Hc #_ * #H @False_ind /2/ ]
+ | * #tc * * * #Hnottrue #Htc1 #Htc2 cut (tc = ta)
+ [ lapply (eq_vec_change_vec ??????? Htc1 Htc2)
+ >change_vec_same // ] -Htc1 -Htc2
+ #Htc destruct (Htc) whd in ⊢ (%→?); #Houtc % [ %
+ [ #Hcurta_prg lapply (\Pf (Hnotfalse ? Hcurta_prg)) * #H @False_ind /2/
+ | #Hcurta_prg lapply (\Pf (Hnottrue ? Hcurta_prg)) * #H @False_ind /2/ ]
+ | #_ #_ @Houtc ]
+ ]
+]
+qed.
+
+definition R_tape_move_obj ≝ λt1,t2:Vector (tape FSUnialpha) 3.
+ ∀c. current ? (nth prg ? t1 (niltape ?)) = Some ? c →
+ t2 = change_vec ?? t1 (tape_move ? (nth obj ? t1 (niltape ?)) (char_to_move c)) obj.
+
+lemma sem_tape_move_obj : tape_move_obj ⊨ R_tape_move_obj.
+@(Realize_to_Realize … sem_tape_move_obj')
+#ta #tb * * #Htb1 #Htb2 #Htb3 * [ *
+[ @Htb2 | @Htb1 ]
+| #Hcurta_prg change with (nth obj ? ta (niltape ?)) in match (tape_move ???);
+ >change_vec_same @Htb3 >Hcurta_prg % #H destruct (H)
+| #Hcurta_prg change with (nth obj ? ta (niltape ?)) in match (tape_move ???);
+ >change_vec_same @Htb3 >Hcurta_prg % #H destruct (H)
+]
+qed.
+
definition restart_tape ≝ λi.
inject_TM ? (move_to_end FSUnialpha L) 2 i ·
mmove i FSUnialpha 2 R.
= low_char (current FinBool t).
* // qed.
-definition low_tapes ≝ λM:normalTM.λc:nconfig (no_states M).Vector_of_list ?
+definition low_tapes: ∀M:normalTM.∀c:nconfig (no_states M).Vector ? 3 ≝
+λM:normalTM.λc:nconfig (no_states M).Vector_of_list ?
[tape_map ?? bit (ctape ?? c);
midtape ? [ ] bar
((bits_of_state ? (nhalt M) (cstate ?? c))@[low_char (current ? (ctape ?? c))]);
midtape ? [ ] bar (tail ? (table_TM ? (graph_enum ?? (ntrans M)) (nhalt M)))
].
-
+
lemma obj_low_tapes: ∀M,c.
nth obj ? (low_tapes M c) (niltape ?) = tape_map ?? bit (ctape ?? c).
// qed.
@map_action
qed.
-definition R_unistep_high ≝ λM:normalTM.λc:nconfig (no_states M).λt1,t2.
+definition R_unistep_high ≝ λM:normalTM.λt1,t2.
+∀c:nconfig (no_states M).
t1 = low_tapes M c →
t2 = low_tapes M (step ? M c).
-lemma R_unistep_equiv : ∀M,c,t1,t2.
+lemma R_unistep_equiv : ∀M,t1,t2.
R_unistep (no_states M) (graph_enum ?? (ntrans M)) (nhalt M) t1 t2 →
- R_unistep_high M c t1 t2.
-#M #c #t1 #t2 #H #Ht1
+ R_unistep_high M t1 t2.
+#M #t1 #t2 #H whd whd in match (nconfig ?); #c #Ht1
lapply (initial_bar ? (nhalt M) (graph_enum ?? (ntrans M)) (nTM_nog ?)) #Htable
(* tup = current tuple *)
cut (∃t.t = 〈〈cstate … c,current ? (ctape … c)〉,
lapply(H (bits_of_state … (nhalt M) qout) (low_char … cout)
(low_mv … m) tup ? Hingraph)
[>Htup whd in ⊢ (??%?); @eq_f >associative_append %] -H
-#Ht2 >Ht2 @(eq_vec ? 3 … (niltape ?)) #i #Hi
+#Ht2 @(eq_vec ? 3 ?? (niltape ?) ?) >Ht2 #i #Hi
cases (le_to_or_lt_eq … (le_S_S_to_le … Hi)) -Hi #Hi
[cases (le_to_or_lt_eq … (le_S_S_to_le … Hi)) -Hi #Hi
[cases (le_to_or_lt_eq … (le_S_S_to_le … Hi)) -Hi #Hi
>Ht1 >prg_low_tapes //
]
qed.
-
-
-
-
\ No newline at end of file
projects / helm.git / blobdiff