1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
15 include "turing/mono.ma".
19 - return its nth element
20 - return the index of a given element
22 axiom FS_crd : FinSet → nat.
23 axiom FS_nth : ∀F:FinSet.nat → option F.
24 axiom index_of_FS : ∀F:FinSet.F → nat.
26 (* unary bit representation (with a given length) of a certain number *)
27 axiom unary_of_nat : nat → nat → (list bool).
29 axiom lt_FS_index_crd : ∀sig,c.index_of_FS sig c < FS_crd sig.
31 (* axiom FinVector : Type[0] → nat → FinSet.*)
33 definition binary_base_states ≝ initN 6.
35 definition bin0 : binary_base_states ≝ mk_Sig ?? 0 (leb_true_to_le 1 6 (refl …)).
36 definition bin1 : binary_base_states ≝ mk_Sig ?? 1 (leb_true_to_le 2 6 (refl …)).
37 definition bin2 : binary_base_states ≝ mk_Sig ?? 2 (leb_true_to_le 3 6 (refl …)).
38 definition bin3 : binary_base_states ≝ mk_Sig ?? 3 (leb_true_to_le 4 6 (refl …)).
39 definition bin4 : binary_base_states ≝ mk_Sig ?? 4 (leb_true_to_le 5 6 (refl …)).
40 definition bin5 : binary_base_states ≝ mk_Sig ?? 5 (leb_true_to_le 6 6 (refl …)).
42 definition states_binaryTM : FinSet → FinSet → FinSet ≝ λsig,states.
43 FinProd (FinProd states binary_base_states)
44 (FinProd (FinOption sig) (initN (S (S (2 * (FS_crd sig)))))).
46 definition to_initN : ∀n,m.n < m → initN m ≝ λn,m,Hn.mk_Sig … n ….// qed.
48 definition initN_pred : ∀n.∀m:initN n.initN n ≝ λn,m.mk_Sig … (pred (pi1 … m)) ….
49 cases m #m0 /2 by le_to_lt_to_lt/ qed.
51 definition displ_of_move ≝ λsig,mv.
57 lemma le_displ_of_move : ∀sig,mv.displ_of_move sig mv ≤ S (2*FS_crd sig).
61 definition displ2_of_move ≝ λsig,mv.
67 lemma le_displ2_of_move : ∀sig,mv.displ2_of_move sig mv ≤ S (2*FS_crd sig).
68 #sig * /2 by lt_to_le/
71 definition mv_tech ≝ λmv.match mv with [ N ⇒ N | _ ⇒ R ].
73 definition trans_binaryTM : ∀sig,states:FinSet.
74 (states × (option sig) → states × (option sig) × move) →
75 ((states_binaryTM sig states) × (option bool) →
76 (states_binaryTM sig states) × (option bool) × move)
77 ≝ λsig,states,trans,p.
79 let 〈s0,phase,ch,count〉 ≝ s in
80 let (H1 : O < S (S (2*FS_crd sig))) ≝ ? in
81 let (H2 : FS_crd sig < S (S (2*FS_crd sig))) ≝ ? in
82 match pi1 … phase with
83 [ O ⇒ (*** PHASE 0: read ***)
84 match pi1 … count with
85 [ O ⇒ 〈〈s0,bin1,ch,to_initN (FS_crd sig) ? H2〉,None ?,N〉
87 [ Some a0 ⇒ if (a0 == true)
88 then 〈〈s0,bin0,FS_nth sig k,initN_pred … count〉, None ?,R〉
89 else 〈〈s0,bin0,ch,initN_pred … count〉,None ?,R〉
90 | None ⇒ (* Overflow position! *)
91 let 〈s',a',mv〉 ≝ trans 〈s0,None ?〉 in
93 [ None ⇒ (* we don't write anything: go to end of 3 *) 〈〈s',bin3,None ?,to_initN (displ2_of_move sig mv) ??〉,None ?,mv_tech mv〉
94 | Some _ ⇒ (* maybe extend tape *) 〈〈s0,bin4,None ?,to_initN O ? H1〉,None ?,R〉 ] ] ]
95 | S phase ⇒ match phase with
96 [ O ⇒ (*** PHASE 1: restart ***)
97 match pi1 … count with
98 [ O ⇒ 〈〈s0,bin2,ch,to_initN (FS_crd sig) ? H2〉,None ?,N〉
99 | S k ⇒ 〈〈s0,bin1,ch,initN_pred … count〉,None ?,L〉 ]
100 | S phase ⇒ match phase with
101 [ O ⇒ (*** PHASE 2: write ***)
102 let 〈s',a',mv〉 ≝ trans 〈s0,ch〉 in
103 match pi1 … count with
104 [ O ⇒ 〈〈s',bin3,ch,to_initN (displ_of_move sig mv) ??〉,None ?,N〉
105 | S k ⇒ match a' with
106 [ None ⇒ 〈〈s0,bin2,ch,initN_pred … count〉,None ?,R〉
107 | Some a0' ⇒ let out ≝ (FS_nth ? k == a') in
108 〈〈s0,bin2,ch,initN_pred … count〉,Some ? out,R〉 ]
110 | S phase ⇒ match phase with
111 [ O ⇒ (*** PHASE 3: move head left ***)
112 match pi1 … count with
113 [ O ⇒ 〈〈s0,bin0,None ?,to_initN (FS_crd sig) ? H2〉, None ?,N〉 (* the end: restart *)
114 | S k ⇒ 〈〈s0,bin3,ch,initN_pred … count〉, None ?,L〉 ]
115 | S phase ⇒ match phase with
116 [ O ⇒ (*** PHASE 4: check position ***)
118 [ None ⇒ (* niltape/rightof: we can write *) 〈〈s0,bin2,ch,to_initN (FS_crd sig) ? H2〉,None ?,N〉
119 | Some _ ⇒ (* leftof *)
120 let 〈s',a',mv〉 ≝ trans 〈s0,ch〉 in
122 [ None ⇒ (* (vacuous) go to end of 2 *) 〈〈s0,bin2,ch,to_initN 0 ? H1〉,None ?,N〉
123 | Some _ ⇒ (* extend tape *) 〈〈s0,bin5,ch,to_initN (FS_crd sig) ? H2〉,None ?,L〉 ]
125 | S _ ⇒ (*** PHASE 5: left extension ***)
126 match pi1 … count with
127 [ O ⇒ 〈〈s0,bin2,ch,to_initN (FS_crd sig) ? H2〉,None ?,R〉
128 | S k ⇒ 〈〈s0,bin5,ch,initN_pred … count〉,Some ? false,L〉 ]]]]]].
129 [ /2 by le_to_lt_to_lt/ | /2 by le_S_S/ |*: /2 by lt_S_to_lt/]
132 definition halt_binaryTM : ∀sig,M.states_binaryTM sig (states sig M) → bool ≝
133 λsig,M,s.let 〈s0,phase,ch,count〉 ≝ s in
134 pi1 … phase == O ∧ halt sig M s0.
137 * Una mk_binaryTM prende in input una macchina M e produce una macchina che:
138 * - ha per alfabeto FinBool
139 * - ha stati di tipo ((states … M) × (initN 7)) ×
140 ((option sig) × (initN (2*dimensione dell'alfabeto di M + 1))
141 * dove il primo elemento corrisponde allo stato della macchina input,
142 * il secondo identifica la fase (lettura, scrittura, spostamento)
143 * il terzo identifica il carattere oggetto letto
144 * il quarto è un contatore
145 * - la funzione di transizione viene prodotta da trans_binaryTM
146 * - la funzione di arresto viene prodotta da halt_binaryTM
148 definition mk_binaryTM ≝
150 mk_TM FinBool (states_binaryTM sig (states sig M))
151 (trans_binaryTM sig (states sig M) (trans sig M))
152 (〈start sig M,bin0,None ?,FS_crd sig〉) (halt_binaryTM sig M).
153 /2 by lt_S_to_lt/ qed.
155 definition bin_char ≝ λsig,ch.unary_of_nat (FS_crd sig) (index_of_FS sig ch).
157 axiom eq_length_bin_char_FS_crd : ∀sig,c.|bin_char sig c| = FS_crd sig.
158 axiom bin_char_FS_nth :
159 ∀sig,c,l1,b,l2.bin_char sig c = l1@b::l2 → b = (FS_nth sig (|l2|) == Some ? c).
161 definition opt_bin_char ≝ λsig,c.match c with
162 [ None ⇒ [ ] | Some c0 ⇒ bin_char sig c0 ].
164 definition bin_list ≝ λsig,l.flatten ? (map ?? (bin_char sig) l).
165 definition rev_bin_list ≝ λsig,l.flatten ? (map ?? (λc.reverse ? (bin_char sig c)) l).
167 definition tape_bin_lift ≝ λsig,t.
168 let ls' ≝ rev_bin_list ? (left ? t) in
169 let c' ≝ option_hd ? (opt_bin_char sig (current ? t)) in
170 let rs' ≝ (tail ? (opt_bin_char sig (current ? t))@bin_list ? (right ? t)) in
171 mk_tape ? ls' c' rs'.
173 definition state_bin_lift :
174 ∀sig.∀M:TM sig.states sig M → states ? (mk_binaryTM ? M)
175 ≝ λsig,M,q.〈q,bin0,None ?,FS_crd sig〉./2 by lt_S_to_lt/ qed.
177 lemma lift_halt_binaryTM :
178 ∀sig,M,q.halt sig M q = halt ? (mk_binaryTM sig M) (state_bin_lift ? M q).
181 lemma binaryTM_bin0_bin1 :
183 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin0,ch,O〉) t)
184 = mk_config ?? (〈q,bin1,ch,to_initN (FS_crd sig) ??〉) t. //
187 lemma binaryTM_bin0_bin3 :
188 ∀sig,M,t,q,ch,k,qn,mv.
189 current ? t = None ? → S k <S (2*FS_crd sig) →
190 〈qn,None ?,mv〉 = trans sig M 〈q,None ?〉 →
191 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin0,ch,S k〉) t)
192 = mk_config ?? (〈qn,bin3,None ?,to_initN (displ2_of_move sig mv) ??〉) (tape_move ? t (mv_tech mv)). [|@le_S //|@le_S_S @le_displ2_of_move]
193 #sig #M #t #q #ch #k #qn #mv #Hcur #Hk #Htrans
194 whd in match (step ???); whd in match (trans ???);
198 lemma binaryTM_bin0_bin4 :
199 ∀sig,M,t,q,ch,k,qn,chn,mv.
200 current ? t = None ? → S k <S (2*FS_crd sig) →
201 〈qn,Some ? chn,mv〉 = trans sig M 〈q,None ?〉 →
202 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin0,ch,S k〉) t)
203 = mk_config ?? (〈q,bin4,None ?,to_initN 0 ??〉) (tape_move ? t R). [2,3:/2 by transitive_lt/]
204 #sig #M #t #q #ch #k #qn #chn #mv #Hcur #Hk #Htrans
205 whd in match (step ???); whd in match (trans ???);
209 lemma binaryTM_bin0_true :
211 current ? t = Some ? true → S k <S (2*FS_crd sig) →
212 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin0,ch,S k〉) t)
213 = mk_config ?? (〈q,bin0,FS_nth sig k,to_initN k ??〉) (tape_move ? t R).[2,3:@le_S /2 by lt_S_to_lt/]
214 #sig #M #t #q #ch #k #Hcur #Hk
215 whd in match (step ???); whd in match (trans ???);
219 lemma binaryTM_bin0_false :
221 current ? t = Some ? false → S k <S (2*FS_crd sig) →
222 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin0,ch,S k〉) t)
223 = mk_config ?? (〈q,bin0,ch,to_initN k ??〉) (tape_move ? t R).[2,3:@le_S /2 by lt_S_to_lt/]
224 #sig #M #t #q #ch #k #Hcur #Hk
225 whd in match (step ???); whd in match (trans ???);
230 axiom binary_to_bin_char :∀sig,csl,csr,a.
231 csl@true::csr=bin_char sig a → FS_nth ? (length ? csr) = Some ? a.
233 axiom daemon : ∀P:Prop.P.
235 lemma binaryTM_phase0_midtape_aux :
238 ∀csr,csl,t,ch.length ? csr < S (2*FS_crd sig) →
239 t = mk_tape ? (reverse ? csl@ls) (option_hd ? (csr@rs)) (tail ? (csr@rs)) →
240 csl@csr = bin_char sig a →
241 |csl@csr| = FS_crd sig →
242 (index_of_FS ? a < |csl| → ch = Some ? a) →
243 loopM ? (mk_binaryTM sig M) (S (length ? csr) + k)
244 (mk_config ?? (〈q,bin0,ch,length ? csr〉) t)
245 = loopM ? (mk_binaryTM sig M) k
246 (mk_config ?? (〈q,bin1,Some ? a,FS_crd sig〉)
247 (mk_tape ? (reverse ? (bin_char ? a)@ls) (option_hd ? rs) (tail ? rs))). [2,3:@le_S /2 by O/]
248 #sig #M #q #ls #a #rs #k #Hhalt #csr elim csr
249 [ #csl #t #ch #Hlen #Ht >append_nil #Hcsl #Hlencsl #Hch >loopM_unfold >loop_S_false [|normalize //]
250 >Hch [| >Hlencsl // ]
251 <loopM_unfold @eq_f >binaryTM_bin0_bin1 @eq_f >Ht
252 whd in match (step ???); whd in match (trans ???); <Hcsl %
254 [ #csr0 #IH #csl #t #ch #Hlen #Ht #Heq #Hcrd #Hch >loopM_unfold >loop_S_false [|normalize //]
255 <loopM_unfold lapply (binary_to_bin_char … Heq) #Ha >binaryTM_bin0_true
257 lapply (IH (csl@[true]) (tape_move FinBool t R) ??????)
259 | >associative_append @Hcrd
260 | >associative_append @Heq
261 | >Ht whd in match (option_hd ??) in ⊢ (??%?); whd in match (tail ??) in ⊢ (??%?);
264 [ normalize >rev_append_def >rev_append_def >reverse_append %
265 | #r1 #rs1 normalize >rev_append_def >rev_append_def >reverse_append % ]
266 | #c1 #csr1 normalize >rev_append_def >rev_append_def >reverse_append % ]
269 #H whd in match (plus ??); >H @eq_f @eq_f2 %
270 | #csr0 #IH #csl #t #ch #Hlen #Ht #Heq #Hcrd #Hch >loopM_unfold >loop_S_false [|normalize //]
271 <loopM_unfold >binaryTM_bin0_false [| >Ht % ]
272 lapply (IH (csl@[false]) (tape_move FinBool t R) ??????)
274 | (* by cases: if index < |csl|, then Hch, else False *)
276 | >associative_append @Hcrd
277 | >associative_append @Heq
278 | >Ht whd in match (option_hd ??) in ⊢ (??%?); whd in match (tail ??) in ⊢ (??%?);
281 [ normalize >rev_append_def >rev_append_def >reverse_append %
282 | #r1 #rs1 normalize >rev_append_def >rev_append_def >reverse_append % ]
283 | #c1 #csr1 normalize >rev_append_def >rev_append_def >reverse_append % ]
286 #H whd in match (plus ??); >H @eq_f @eq_f2 %
291 lemma le_to_eq : ∀m,n.m ≤ n → ∃k. n = m + k. /3 by plus_minus, ex_intro/
294 lemma minus_tech : ∀a,b.a + b - a = b. // qed.
296 lemma binaryTM_phase0_midtape :
297 ∀sig,M,t,q,ls,a,rs,ch.
300 t = mk_tape ? ls (option_hd ? (bin_char ? a)) (tail ? (bin_char sig a)@rs) →
301 ∀k.S (FS_crd sig) ≤ k →
302 loopM ? (mk_binaryTM sig M) k
303 (mk_config ?? (〈q,bin0,ch,FS_crd sig〉) t)
304 = loopM ? (mk_binaryTM sig M) (k - S (FS_crd sig))
305 (mk_config ?? (〈q,bin1,Some ? a,FS_crd sig〉)
306 (mk_tape ? (reverse ? (bin_char ? a)@ls) (option_hd ? rs) (tail ? rs))). [|*:@le_S //]
307 #sig #M #t #q #ls #a #rs #ch #Hcrd #Hhalt #Ht #k #Hk
308 cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >(minus_tech (S (FS_crd sig)))
309 cut (∃c,cl.bin_char sig a = c::cl)
310 [ lapply (refl ? (|bin_char ? a|)) >eq_length_bin_char_FS_crd in ⊢ (???%→?);
311 cases (bin_char ? a) normalize /3 by ex_intro/ #H
312 <H in Hcrd; -H #H cases (not_le_Sn_O O) #Hfalse cases (Hfalse H) ]
314 cut (FS_crd sig = |bin_char sig a|) [/2 by plus_minus_m_m/] #Hlen
315 @(trans_eq ?? (loopM ? (mk_binaryTM ? M) (S (|c::cl|) + k0)
316 (mk_config ?? 〈q,bin0,〈ch,|c::cl|〉〉 t)))
317 [ @le_S_S <Ha <Hlen // | @eq_f2 // @eq_f2 // @eq_f <Ha >Hlen % ]
318 >(binaryTM_phase0_midtape_aux ? M q ls a rs ? ? (c::cl) [ ] t ch) //
319 [| normalize #Hfalse @False_ind cases (not_le_Sn_O ?) /2/
327 lemma binaryTM_phase0_None_None :
328 ∀sig,M,t,q,ch,n,qn,mv.
329 O < n → n < 2*FS_crd sig →
331 current ? t = None ? →
332 〈qn,None ?,mv〉 = trans sig M 〈q,None ?〉 →
334 loopM ? (mk_binaryTM sig M) k (mk_config ?? (〈q,bin0,ch,n〉) t)
335 = loopM ? (mk_binaryTM sig M) (k-1)
336 (mk_config ?? (〈qn,bin3,None ?,to_initN (displ2_of_move sig mv) ??〉) (tape_move ? t (mv_tech mv))). [| @le_S @le_S //|@le_S_S @le_displ2_of_move]
337 #sig #M #t #q #ch #n #qn #mv #HOn #Hn #Hhalt #Hcur #Htrans #k #Hk
338 cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >minus_tech
339 cases (le_to_eq … HOn) #n0 #Hn0 destruct (Hn0)
340 lapply Htrans lapply Hcur -Htrans -Hcur cases t
341 [ >loopM_unfold >loop_S_false [|@Hhalt] #Hcur #Htrans >binaryTM_bin0_bin3 //
342 | #r0 #rs0 >loopM_unfold >loop_S_false [|@Hhalt] #Hcur #Htrans >binaryTM_bin0_bin3 //
343 | #l0 #ls0 >loopM_unfold >loop_S_false [|@Hhalt] #Hcur #Htrans >binaryTM_bin0_bin3 //
344 | #ls #cur #rs normalize in ⊢ (%→?); #H destruct (H) ]
347 lemma binaryTM_phase0_None_Some :
348 ∀sig,M,t,q,ch,n,qn,chn,mv.
349 O < n → n < 2*FS_crd sig →
351 current ? t = None ? →
352 〈qn,Some ? chn,mv〉 = trans sig M 〈q,None ?〉 →
354 loopM ? (mk_binaryTM sig M) k (mk_config ?? (〈q,bin0,ch,n〉) t)
355 = loopM ? (mk_binaryTM sig M) (k-1)
356 (mk_config ?? (〈q,bin4,None ?,to_initN O ??〉) (tape_move ? t R)). [2,3: /2 by transitive_lt/ ]
357 #sig #M #t #q #ch #n #qn #chn #mv #HOn #Hn #Hhalt #Hcur #Htrans #k #Hk
358 cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >minus_tech
359 cases (le_to_eq … HOn) #n0 #Hn0 destruct (Hn0)
360 lapply Htrans lapply Hcur -Hcur -Htrans cases t
361 [ >loopM_unfold >loop_S_false [|@Hhalt] #Hcur #Htrans >binaryTM_bin0_bin4 // /2 by refl, transitive_lt/
362 | #r0 #rs0 >loopM_unfold >loop_S_false [|@Hhalt] #Hcur #Htrans >binaryTM_bin0_bin4 // /2 by refl, transitive_lt/
363 | #l0 #ls0 >loopM_unfold >loop_S_false [|@Hhalt] #Hcur #Htrans >binaryTM_bin0_bin4 // /2 by refl, transitive_lt/
364 | #ls #cur #rs normalize in ⊢ (%→?); #H destruct (H) ]
367 lemma binaryTM_bin1_O :
369 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin1,ch,O〉) t)
370 = mk_config ?? (〈q,bin2,ch,to_initN (FS_crd sig) ??〉) t. [2,3:/2 by lt_S_to_lt/]
374 lemma binaryTM_bin1_S :
375 ∀sig,M,t,q,ch,k. S k <S (2*FS_crd sig) →
376 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin1,ch,S k〉) t)
377 = mk_config ?? (〈q,bin1,ch,to_initN k ??〉) (tape_move ? t L). [2,3:@le_S /2 by lt_S_to_lt/]
378 #sig #M #t #q #ch #k #HSk %
381 lemma binaryTM_phase1 :
382 ∀sig,M,q,ls1,ls2,cur,rs,ch.
383 |ls1| = FS_crd sig → (cur = None ? → rs = [ ]) →
384 ∀k.S (FS_crd sig) ≤ k →
385 loopM ? (mk_binaryTM sig M) k
386 (mk_config ?? (〈q,bin1,ch,FS_crd sig〉) (mk_tape ? (ls1@ls2) cur rs))
387 = loopM ? (mk_binaryTM sig M) (k - S (FS_crd sig))
388 (mk_config ?? (〈q,bin2,ch,FS_crd sig〉)
389 (mk_tape ? ls2 (option_hd ? (reverse ? ls1@option_cons ? cur rs))
390 (tail ? (reverse ? ls1@option_cons ? cur rs)))). [2,3:/2 by O/]
391 cut (∀sig,M,q,ls1,ls2,ch,k,n,cur,rs.
392 |ls1| = n → n<S (2*FS_crd sig) → (cur = None ? → rs = [ ]) →
393 loopM ? (mk_binaryTM sig M) (S n + k)
394 (mk_config ?? (〈q,bin1,ch,n〉) (mk_tape ? (ls1@ls2) cur rs))
395 = loopM ? (mk_binaryTM sig M) k
396 (mk_config ?? (〈q,bin2,ch,FS_crd sig〉)
397 (mk_tape ? ls2 (option_hd ? (reverse ? ls1@option_cons ? cur rs))
398 (tail ? (reverse ? ls1@option_cons ? cur rs))))) [1,2:@le_S //]
399 [ #sig #M #q #ls1 #ls2 #ch #k elim ls1
400 [ #n normalize in ⊢ (%→?); #cur #rs #Hn <Hn #Hcrd #Hcur >loopM_unfold >loop_S_false [| % ]
401 >binaryTM_bin1_O cases cur in Hcur;
402 [ #H >(H (refl ??)) -H %
404 | #l0 #ls0 #IH * [ #cur #rs normalize in ⊢ (%→?); #H destruct (H) ]
405 #n #cur #rs normalize in ⊢ (%→?); #H destruct (H) #Hlt #Hcur
406 >loopM_unfold >loop_S_false [|%] >binaryTM_bin1_S
407 <(?:mk_tape ? (ls0@ls2) (Some ? l0) (option_cons ? cur rs) =
408 tape_move FinBool (mk_tape FinBool ((l0::ls0)@ls2) cur rs) L)
409 [| cases cur in Hcur; [ #H >(H ?) // | #cur' #_ % ] ]
410 >(?:loop (config FinBool (states FinBool (mk_binaryTM sig M))) (S (|ls0|)+k)
411 (step FinBool (mk_binaryTM sig M))
412 (λc:config FinBool (states FinBool (mk_binaryTM sig M))
413 .halt FinBool (mk_binaryTM sig M)
414 (cstate FinBool (states FinBool (mk_binaryTM sig M)) c))
415 (mk_config FinBool (states FinBool (mk_binaryTM sig M))
416 〈q,bin1,ch,to_initN (|ls0|) ?
417 (le_S ?? (lt_S_to_lt (|ls0|) (S (2*FS_crd sig)) Hlt))〉
418 (mk_tape FinBool (ls0@ls2) (Some FinBool l0) (option_cons FinBool cur rs)))
419 = loopM FinBool (mk_binaryTM sig M) k
420 (mk_config FinBool (states FinBool (mk_binaryTM sig M))
421 〈q,bin2,〈ch,FS_crd sig〉〉
423 (option_hd FinBool (reverse FinBool ls0@l0::option_cons FinBool cur rs))
424 (tail FinBool (reverse FinBool ls0@l0::option_cons FinBool cur rs)))))
426 | >(?: l0::option_cons ? cur rs = option_cons ? (Some ? l0) (option_cons ? cur rs)) [| % ]
427 @trans_eq [|| @(IH ??? (refl ??)) [ /2 by lt_S_to_lt/ | #H destruct (H) ] ]
430 >reverse_cons >associative_append %
432 | #Hcut #sig #M #q #ls1 #ls2 #cur #rs #ch #Hlen #Hcur #k #Hk
433 cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >minus_tech @Hcut /2/ ]
436 lemma binaryTM_bin2_O :
437 ∀sig,M,t,q,qn,ch,chn,mv.
438 〈qn,chn,mv〉 = trans sig M 〈q,ch〉 →
439 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin2,ch,O〉) t)
440 = mk_config ?? (〈qn,bin3,ch,to_initN (displ_of_move sig mv) ??〉) t.[2,3:/2 by lt_S_to_lt,le_S_S/]
441 #sig #M #t #q #qn #ch #chn #mv #Htrans
442 whd in match (step ???); whd in match (trans ???); <Htrans %
445 lemma binaryTM_bin2_S_None :
446 ∀sig,M,t,q,qn,ch,mv,k.
447 k < S (2*FS_crd sig) →
448 〈qn,None ?,mv〉 = trans sig M 〈q,ch〉 →
449 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin2,ch,S k〉) t)
450 = mk_config ?? (〈q,bin2,ch,k〉) (tape_move ? t R).
451 [2,3: @le_S_S /2 by lt_to_le/ ]
452 #sig #M #t #q #qn #ch #mv #k #Hk #Htrans
453 whd in match (step ???); whd in match (trans ???); <Htrans %
456 lemma binaryTM_bin2_S_Some :
457 ∀sig,M,t,q,qn,ch,chn,mv,k.
458 k< S (2*FS_crd sig) →
459 〈qn,Some ? chn,mv〉 = trans sig M 〈q,ch〉 →
460 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin2,ch,S k〉) t)
461 = mk_config ?? (〈q,bin2,ch,k〉) (tape_move ? (tape_write ? t (Some ? (FS_nth ? k == Some ? chn))) R).
462 [2,3: @le_S_S /2 by lt_to_le/ ]
463 #sig #M #t #q #qn #ch #chn #mv #k #Hk #Htrans
464 whd in match (step ???); whd in match (trans ???); <Htrans %
467 let rec iter (T:Type[0]) f n (t:T) on n ≝
468 match n with [ O ⇒ t | S n0 ⇒ iter T f n0 (f t) ].
470 lemma binaryTM_phase2_None :∀sig,M,q,ch,qn,mv.
471 〈qn,None ?,mv〉 = trans sig M 〈q,ch〉 →
472 ∀n.n≤S (2*FS_crd sig) →
474 loopM ? (mk_binaryTM sig M) k
475 (mk_config ?? (〈q,bin2,ch,n〉) t)
476 = loopM ? (mk_binaryTM sig M) (k - S n)
477 (mk_config ?? (〈qn,bin3,ch,to_initN (displ_of_move sig mv) ??〉)
478 (iter ? (λt0.tape_move ? t0 R) n t)). [2,3: @le_S_S /2 by lt_S_to_lt/]
479 #sig #M #q #ch #qn #mv #Htrans #n #Hn #t #k #Hk
480 cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >minus_tech lapply Hn lapply t -Hn -t
482 [ #t #Hle >loopM_unfold >loop_S_false //
483 >(binaryTM_bin2_O … Htrans) //
484 | #n0 #IH #t #Hn0 >loopM_unfold >loop_S_false //
485 >(binaryTM_bin2_S_None … Htrans) @(trans_eq ???? (IH …)) //
489 lemma binaryTM_phase2_Some_of : ∀sig,M,q,ch,qn,chn,mv,ls.
490 〈qn,Some ? chn,mv〉 = trans sig M 〈q,ch〉 →
491 ∀k.S (FS_crd sig) ≤ k →
492 loopM ? (mk_binaryTM sig M) k
493 (mk_config ?? (〈q,bin2,ch,FS_crd sig〉) (mk_tape ? ls (None ?) [ ]))
494 = loopM ? (mk_binaryTM sig M) (k - S (FS_crd sig))
495 (mk_config ?? (〈qn,bin3,ch,displ_of_move sig mv〉)
496 (mk_tape ? (reverse ? (bin_char sig chn)@ls) (None ?) [ ])). [2,3:@le_S_S //]
497 cut (∀sig,M,q,ch,qn,chn,mv,ls,k,n.
498 S n ≤ k → 〈qn,Some ? chn,mv〉 = trans sig M 〈q,ch〉 →
499 ∀csl. n <S (2*FS_crd sig) →
500 |csl| + n = FS_crd sig →
501 (∃fs.bin_char sig chn = reverse ? csl@fs) →
502 loopM ? (mk_binaryTM sig M) k
503 (mk_config ?? (〈q,bin2,ch,n〉) (mk_tape ? (csl@ls) (None ?) [ ]))
504 = loopM ? (mk_binaryTM sig M) (k - S n)
505 (mk_config ?? (〈qn,bin3,ch,displ_of_move sig mv〉)
506 (mk_tape ? (reverse ? (bin_char sig chn)@ls) (None ?) [ ]))) [1,2:@le_S_S //]
507 [ #sig #M #q #ch #qn #chn #mv #ls #k #n #Hk
508 cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >minus_tech
510 [ #csl #Hcount #Hcrd * #fs #Hfs >loopM_unfold >loop_S_false // <loopM_unfold
512 [ cases fs in Hfs; // #f0 #fs0 #H lapply (eq_f ?? (length ?) … H)
513 >length_append >(?:|bin_char sig chn| = FS_crd sig) [|//]
514 <Hcrd >length_reverse #H1 cut (O = |f0::fs0|) [ /2/ ]
515 normalize #H1 destruct (H1) ]
516 #H destruct (H) >append_nil in Hfs; #Hfs
517 >Hfs >reverse_reverse >(binaryTM_bin2_O … Htrans) //
518 | #n0 #IH #csl #Hcount #Hcrd * #fs #Hfs
519 >loopM_unfold >loop_S_false // <loopM_unfold
520 >(?: step FinBool (mk_binaryTM sig M)
521 (mk_config FinBool (states FinBool (mk_binaryTM sig M)) 〈q,bin2,〈ch,S n0〉〉
522 (mk_tape FinBool (csl@ls) (None FinBool) []))
523 = mk_config ?? (〈q,bin2,ch,n0〉)
524 (tape_move ? (tape_write ?
525 (mk_tape ? (csl@ls) (None ?) [ ]) (Some ? (FS_nth ? n0 == Some ? chn))) R))
526 [| /2 by lt_S_to_lt/ | @(binaryTM_bin2_S_Some … Htrans) ]
527 >(?: tape_move ? (tape_write ???) ? =
528 mk_tape ? (((FS_nth ? n0 == Some sig chn)::csl)@ls) (None ?) [ ])
529 [| cases csl // cases ls // ]
531 [ #Hfalse cut (|bin_char ? chn| = |csl|) [ >Hfalse >length_append >length_reverse // ]
532 -Hfalse >(?:|bin_char sig chn| = FS_crd sig) [|//]
533 <Hcrd in ⊢ (%→?); >(?:|csl| = |csl|+ O) in ⊢ (???%→?); //
534 #Hfalse cut (S n0 = O) /2 by injective_plus_r/ #H destruct (H)
536 cut (bin_char ? chn = reverse ? csl@(FS_nth ? n0 == Some ? chn)::fs0)
537 [ >Hbinchar >(bin_char_FS_nth … Hbinchar) >(?:|fs0|=n0) //
538 <(eq_length_bin_char_FS_crd sig chn) in Hcrd; >Hbinchar
539 >length_append >length_reverse whd in ⊢ (???(??%)→?); /2 by injective_S/ ]
540 -Hbinchar #Hbinchar >Hbinchar @(trans_eq ???? (IH …)) //
541 [ %{fs0} >reverse_cons >associative_append @Hbinchar
542 | whd in ⊢ (??%?); <Hcrd // ]
543 @eq_f @eq_f @eq_f3 //
546 | #Hcut #sig #M #q #ch #qn #chn #mv #ls #Htrans #k #Hk
548 [3: @(trans_eq ???? (Hcut ??????? ls ? (FS_crd sig) ? Htrans …)) //
549 [3:@([ ]) | %{(bin_char ? chn)} % | % ]
554 lemma binaryTM_phase2_Some_ow : ∀sig,M,q,ch,qn,chn,mv,ls,cs,rs.
555 〈qn,Some ? chn,mv〉 = trans sig M 〈q,ch〉 →
557 ∀k.S (FS_crd sig) ≤ k →
558 loopM ? (mk_binaryTM sig M) k
559 (mk_config ?? (〈q,bin2,ch,FS_crd sig〉)
560 (mk_tape ? ls (option_hd ? (cs@rs)) (tail ? (cs@rs))))
561 = loopM ? (mk_binaryTM sig M) (k - S (FS_crd sig))
562 (mk_config ?? (〈qn,bin3,ch,displ_of_move sig mv〉)
563 (mk_tape ? (reverse ? (bin_char sig chn)@ls) (option_hd ? rs) (tail ? rs))). [2,3:@le_S_S /2 by O/]
564 cut (∀sig,M,q,ch,qn,chn,mv,ls,rs,k,csr.
565 〈qn,Some ? chn,mv〉 = trans sig M 〈q,ch〉 →
566 ∀csl.|csr|<S (2*FS_crd sig) →
567 |csl@csr| = FS_crd sig →
568 (∃fs.bin_char sig chn = reverse ? csl@fs) →
569 loopM ? (mk_binaryTM sig M) (S (|csr|) + k)
570 (mk_config ?? (〈q,bin2,ch,|csr|〉)
571 (mk_tape ? (csl@ls) (option_hd ? (csr@rs)) (tail ? (csr@rs))))
572 = loopM ? (mk_binaryTM sig M) k
573 (mk_config ?? (〈qn,bin3,ch,displ_of_move sig mv〉)
574 (mk_tape ? (reverse ? (bin_char sig chn)@ls) (option_hd ? rs) (tail ? rs)))) [1,2: @le_S_S /2 by le_S/]
575 [ #sig #M #q #ch #qn #chn #mv #ls #rs #k #csr #Htrans elim csr
576 [ #csl #Hcount #Hcrd * #fs #Hfs >loopM_unfold >loop_S_false // normalize in match (length ? [ ]);
577 >(binaryTM_bin2_O … Htrans) <loopM_unfold @eq_f @eq_f @eq_f3 //
578 cases fs in Hfs; // #f0 #fs0 #H lapply (eq_f ?? (length ?) … H)
579 >length_append >(?:|bin_char sig chn| = FS_crd sig) [|//]
580 <Hcrd >length_reverse #H1 cut (O = |f0::fs0|) [ /2/ ]
581 normalize #H1 destruct (H1)
582 | #b0 #bs0 #IH #csl #Hcount #Hcrd * #fs #Hfs
583 >loopM_unfold >loop_S_false // >(binaryTM_bin2_S_Some … Htrans)
584 >(?: tape_move ? (tape_write ???) ? =
585 mk_tape ? (((FS_nth ? (|bs0|)==Some sig chn)::csl)@ls)
586 (option_hd ? (bs0@rs)) (tail ? (bs0@rs)))
587 in match (tape_move ? (tape_write ???) ?);
588 [| cases bs0 // cases rs // ] @IH
589 [ whd in Hcount:(?%?); /2 by lt_S_to_lt/
590 | <Hcrd >length_append >length_append normalize //
592 [ #Hfalse cut (|bin_char ? chn| = |csl|) [ >Hfalse >length_append >length_reverse // ] -Hfalse >(?:|bin_char sig chn| = FS_crd sig) [|//]
593 <Hcrd >length_append normalize >(?:|csl| = |csl|+ O) in ⊢ (???%→?); //
594 #Hfalse cut (S (|bs0|) = O) /2 by injective_plus_r/ #H destruct (H)
596 cut (bin_char ? chn = reverse ? csl@(FS_nth ? (|bs0|) == Some ? chn)::fs0)
597 [ >Hbinchar >(bin_char_FS_nth … Hbinchar) >(?:|fs0|=|bs0|) //
598 <(eq_length_bin_char_FS_crd sig chn) in Hcrd; >Hbinchar
599 >length_append >length_append >length_reverse
600 whd in ⊢ (??(??%)(??%)→?); /2 by injective_S/ ]
601 -Hbinchar #Hbinchar >Hbinchar %{fs0} >reverse_cons >associative_append %
605 | #Hcut #sig #M #q #ch #qn #chn #mv #ls #cs #rs #Htrans #Hcrd #k #Hk
606 cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >minus_tech @trans_eq
607 [3: @(trans_eq ???? (Hcut ??????? ls ?? cs Htrans [ ] …)) //
608 [ normalize % // | normalize @Hcrd | >Hcrd // ]
609 || @eq_f2 [ >Hcrd % | @eq_f2 // @eq_f cases Hcrd // ] ] ]
612 lemma binaryTM_bin3_O :
614 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin3,ch,O〉) t)
615 = mk_config ?? (〈q,bin0,None ?,to_initN (FS_crd sig) ??〉) t. [2,3:@le_S //]
619 lemma binaryTM_bin3_S :
620 ∀sig,M,t,q,ch,k. S k ≤ S (2*FS_crd sig) →
621 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin3,ch,S k〉) t)
622 = mk_config ?? (〈q,bin3,ch,to_initN k ??〉) (tape_move ? t L). [2,3: @le_S_S /2 by lt_to_le/]
623 #sig #M #t #q #ch #k #HSk %
626 lemma binaryTM_phase3 :∀sig,M,q,ch,n.
627 n ≤ S (2*FS_crd sig) →
629 loopM ? (mk_binaryTM sig M) k
630 (mk_config ?? (〈q,bin3,ch,n〉) t)
631 = loopM ? (mk_binaryTM sig M) (k - S n)
632 (mk_config ?? (〈q,bin0,None ?,FS_crd sig〉)
633 (iter ? (λt0.tape_move ? t0 L) n t)). [2,3: /2 by lt_S_to_lt, le_to_lt_to_lt/]
634 #sig #M #q #ch #n #Hcrd #t #k #Hk
635 cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >(minus_tech (S n) k0)
636 lapply t lapply Hcrd -t -Hcrd elim n
637 [ #Hcrd #t >loopM_unfold >loop_S_false [| % ] >binaryTM_bin3_O //
638 | #n0 #IH #Hlt #t >loopM_unfold >loop_S_false [|%] >binaryTM_bin3_S [|@Hlt]
639 <IH [|@lt_to_le @Hlt ]
643 lemma binaryTM_bin4_None :
645 current ? t = None ? →
646 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin4,ch,O〉) t)
647 = mk_config ?? (〈q,bin2,ch,to_initN (FS_crd sig) ??〉) t. [|@le_S_S @le_O_n | @le_S_S // ]
648 #sig #M #t #q #ch #Hcur whd in ⊢ (??%?); >Hcur %
651 lemma binaryTM_phase4_write : ∀sig,M,q,ch,t.current ? t = None ? →
653 loopM ? (mk_binaryTM sig M) k
654 (mk_config ?? (〈q,bin4,ch,O〉) t)
655 = loopM ? (mk_binaryTM sig M) (k-1)
656 (mk_config ?? (〈q,bin2,ch,to_initN (FS_crd sig) ??〉) t). [|@le_S_S @le_O_n|@le_S_S //]
657 #sig #M #q #ch #t #Hcur #k #Hk
658 cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >minus_tech
659 >loopM_unfold >loop_S_false // <loopM_unfold >binaryTM_bin4_None [|//] %
662 (* we don't get here any more! *
663 lemma binaryTM_bin4_noextend :
664 ∀sig,M,t,q,ch,cur,qn,mv.
665 current ? t = Some ? cur →
666 〈qn,None ?,mv〉 = trans sig M 〈q,ch〉 →
667 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin4,ch,O〉) t)
668 = mk_config ?? (〈q,bin2,ch,to_initN O ??〉) t. [2,3://]
669 #sig #M #t #q #ch #cur #qn #mv #Hcur #Htrans
670 whd in ⊢ (??%?); >Hcur whd in ⊢ (??%?);
671 whd in match (trans FinBool ??); <Htrans %
675 lemma binaryTM_bin4_extend :
676 ∀sig,M,t,q,ch,cur,qn,an,mv.
677 current ? t = Some ? cur →
678 〈qn,Some ? an,mv〉 = trans sig M 〈q,ch〉 →
679 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin4,ch,O〉) t)
680 = mk_config ?? (〈q,bin5,ch,to_initN (FS_crd sig) ??〉) (tape_move ? t L). [2,3:@le_S //]
681 #sig #M #t #q #ch #cur #qn #an #mv #Hcur #Htrans
682 whd in ⊢ (??%?); >Hcur whd in ⊢ (??%?);
683 whd in match (trans FinBool ??); <Htrans %
686 lemma binaryTM_phase4_extend : ∀sig,M,q,ch,t,cur,qn,an,mv.
687 current ? t = Some ? cur → 〈qn,Some ? an,mv〉 = trans sig M 〈q,ch〉 →
689 loopM ? (mk_binaryTM sig M) k
690 (mk_config ?? (〈q,bin4,ch,O〉) t)
691 = loopM ? (mk_binaryTM sig M) (k-1)
692 (mk_config ?? (〈q,bin5,ch,to_initN (FS_crd sig) ??〉) (tape_move ? t L)). [2,3: @le_S //]
693 #sig #M #q #ch #t #cur #qn #an #mv #Hcur #Htrans #k #Hk
694 cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >minus_tech
695 >loopM_unfold >loop_S_false // <loopM_unfold >(binaryTM_bin4_extend … Hcur) [|*://] %
698 lemma binaryTM_bin5_O :
700 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin5,ch,O〉) t)
701 = mk_config ?? (〈q,bin2,ch,to_initN (FS_crd sig) ??〉) (tape_move ? t R). [2,3:@le_S //]
705 lemma binaryTM_bin5_S :
706 ∀sig,M,t,q,ch,k. S k <S (2*FS_crd sig) →
707 step ? (mk_binaryTM sig M) (mk_config ?? (〈q,bin5,ch,S k〉) t)
708 = mk_config ?? (〈q,bin5,ch,to_initN k ??〉) (tape_move ? (tape_write ? t (Some ? false)) L). [2,3:@le_S /2 by lt_S_to_lt/]
709 #sig #M #t #q #ch #k #HSk %
712 (* extends the tape towards the left with an unimportant sequence that will be
713 immediately overwritten *)
714 lemma binaryTM_phase5 :∀sig,M,q,ch,n.
715 ∀rs.n<S (2*FS_crd sig) →
718 loopM ? (mk_binaryTM sig M) k
719 (mk_config ?? (〈q,bin5,ch,n〉) (mk_tape ? [] (None ?) rs))
720 = loopM ? (mk_binaryTM sig M) (k - S n)
721 (mk_config ?? (〈q,bin2,ch,FS_crd sig〉)
722 (mk_tape ? [] (option_hd ? (bs@rs)) (tail ? (bs@rs)))). [2,3:@le_S //]
723 #sig #M #q #ch #n elim n
724 [ #rs #Hlt %{[]} % // #k #Hk cases (le_to_eq … Hk) #k0 #Hk0 >Hk0 >minus_tech -Hk0
726 | #n0 #IH #rs #Hn0 cases (IH (false::rs) ?) [|/2 by lt_S_to_lt/]
727 #bs * #Hbs -IH #IH %{(bs@[false])} % [ <Hbs >length_append /2 by increasing_to_injective/ ]
728 #k #Hk cases (le_to_eq … Hk) #k0 #Hk0 >Hk0
729 >loopM_unfold >loop_S_false // >binaryTM_bin5_S
730 >associative_append normalize in match ([false]@?); <(IH (S n0 + k0)) [|//]
731 >loopM_unfold @eq_f @eq_f cases rs //
735 lemma current_None_or_midtape :
736 ∀sig,t.current sig t = None sig ∨ ∃ls,c,rs.t = midtape sig ls c rs.
737 #sig * normalize /2/ #ls #c #rs %2 /4 by ex_intro/
740 lemma state_bin_lift_unfold :
741 ∀sig.∀M:TM sig.∀q:states sig M.
742 state_bin_lift sig M q = 〈q,bin0,None ?,FS_crd sig〉.// qed.
744 axiom current_tape_bin_list :
745 ∀sig,t.current sig t = None ? → current ? (tape_bin_lift sig t) = None ?.
747 lemma tape_bin_lift_unfold :
748 ∀sig,t. tape_bin_lift sig t =
749 mk_tape ? (rev_bin_list ? (left ? t)) (option_hd ? (opt_bin_char sig (current ? t)))
750 (tail ? (opt_bin_char sig (current ? t))@bin_list ? (right ? t)). //
753 lemma reverse_bin_char_list : ∀sig,c,l.
754 reverse ? (bin_char sig c)@rev_bin_list ? l = rev_bin_list ? (c::l). // qed.
756 lemma left_midtape : ∀sig,ls,c,rs.left ? (midtape sig ls c rs) = ls.// qed.
757 lemma current_midtape : ∀sig,ls,c,rs.current ? (midtape sig ls c rs) = Some ? c.// qed.
758 lemma right_midtape : ∀sig,ls,c,rs.right ? (midtape sig ls c rs) = rs.// qed.
759 lemma opt_bin_char_Some : ∀sig,c.opt_bin_char sig (Some ? c) = bin_char ? c.// qed.
761 lemma opt_cons_hd_tl : ∀A,l.option_cons A (option_hd ? l) (tail ? l) = l.
764 lemma le_tech : ∀a,b,c.a ≤ b → a * c ≤ b * c.
765 #a #b #c #H /2 by monotonic_le_times_r/
768 lemma iter_split : ∀T,f,m,n,x.
769 iter T f (m+n) x = iter T f m (iter T f n x).
770 #T #f #m #n elim n /2/
771 #n0 #IH #x <plus_n_Sm whd in ⊢ (??%(????%)); >IH %
774 lemma iter_O : ∀T,f,x.iter T f O x = x.// qed.
776 lemma iter_tape_move_R : ∀T,n,ls,cs,rs.|cs| = n →
777 iter ? (λt0.tape_move T t0 R) n (mk_tape ? ls (option_hd ? (cs@rs)) (tail ? (cs@rs)))
778 = mk_tape ? (reverse ? cs@ls) (option_hd ? rs) (tail ? rs).
780 [ #ls * [| #c0 #cs0 #rs #H normalize in H; destruct (H) ] #rs #_ %
781 | #n0 #IH #ls * [ #rs #H normalize in H; destruct (H) ] #c #cs #rs #Hlen
783 >(?: (tape_move T (mk_tape T ls (option_hd T ((c::cs)@rs)) (tail T ((c::cs)@rs))) R)
784 = mk_tape ? (c::ls) (option_hd ? (cs@rs)) (tail ? (cs@rs))) in ⊢ (??(????%)?);
785 [| cases cs // cases rs // ] >IH
786 [ >reverse_cons >associative_append %
787 | normalize in Hlen; destruct (Hlen) % ]
791 lemma tail_tech : ∀T,l1,l2.O < |l1| → tail T (l1@l2) = tail ? l1@l2.
792 #T * normalize // #l2 #Hfalse @False_ind cases (not_le_Sn_O O) /2/
795 lemma hd_tech : ∀T,l1,l2.O < |l1| → option_hd T (l1@l2) = option_hd ? l1.
796 #T * normalize // #l2 #Hfalse @False_ind cases (not_le_Sn_O O) /2/
799 lemma iter_tape_move_L_nil : ∀T,n,rs.
800 iter ? (λt0.tape_move T t0 L) n (mk_tape ? [ ] (None ?) rs) =
801 mk_tape ? [ ] (None ?) rs.
802 #T #n #rs elim n // #n0 #IH <IH in ⊢ (???%); cases rs //
805 lemma iter_tape_move_R_nil : ∀T,n,ls.
806 iter ? (λt0.tape_move T t0 R) n (mk_tape ? ls (None ?) [ ]) =
807 mk_tape ? ls (None ?) [ ].
808 #T #n #ls elim n // #n0 #IH <IH in ⊢ (???%); cases ls //
811 lemma iter_tape_move_L_left : ∀T,n,cs,rs. O < n →
812 iter ? (λt0.tape_move T t0 L) n
813 (mk_tape ? [ ] (option_hd ? cs) (tail ? cs@rs)) =
814 mk_tape ? [ ] (None ?) (cs@rs).
816 [ cases cs // cases rs //
817 | #m #_ whd in ⊢ (??%?); <(iter_tape_move_L_nil ? m) cases cs // cases rs // ]
820 lemma iter_tape_move_L : ∀T,n,ls,cs,rs.|cs| = n →
821 iter ? (λt0.tape_move T t0 L) n (mk_tape ? (reverse ? cs@ls) (option_hd ? rs) (tail ? rs))
822 = mk_tape ? ls (option_hd ? (cs@rs)) (tail ? (cs@rs)).
824 [ #ls * [| #c0 #cs0 #rs #H normalize in H; destruct (H) ] #rs #_ %
825 | #n0 #IH #ls #cs #rs @(list_elim_left … cs)
826 [ #H normalize in H; destruct (H) ] -cs
827 #c #cs #_ #Hlen >reverse_append whd in ⊢ (??%?);
828 >(?: tape_move T (mk_tape T ((reverse T [c]@reverse T cs)@ls) (option_hd T rs) (tail T rs)) L
829 = mk_tape ? (reverse T cs@ls) (option_hd ? (c::rs)) (tail ? (c::rs))) in ⊢ (??(????%)?);
831 [ >associative_append %
832 | >length_append in Hlen; normalize // ]
836 lemma tape_move_niltape :
837 ∀sig,mv.tape_move sig (niltape ?) mv = niltape ?. #sig * // qed.
839 lemma iter_tape_move_niltape :
840 ∀sig,mv,n.iter … (λt.tape_move sig t mv) n (niltape ?) = niltape ?.
841 #sig #mv #n elim n // -n #n #IH whd in ⊢ (??%?); >tape_move_niltape //
844 lemma tape_move_R_left :
845 ∀sig,rs.tape_move sig (mk_tape ? [ ] (None ?) rs) R =
846 mk_tape ? [ ] (option_hd ? rs) (tail ? rs). #sig * //
849 axiom loop_increase : ∀sig,M,m,n,cfg,cfg'.m < n →
850 loopM sig M m cfg = Some ? cfg' → loopM sig M n cfg = Some ? cfg'.
852 lemma binaryTM_loop :
853 ∀sig,M,i,tf,qf. O < FS_crd sig →
855 ((loopM sig M i (mk_config ?? q t) = Some ? (mk_config ?? qf tf) →
856 loopM ? (mk_binaryTM sig M) k
857 (mk_config ?? (state_bin_lift ? M q) (tape_bin_lift ? t)) =
858 Some ? (mk_config ?? (state_bin_lift ? M qf) (tape_bin_lift ? tf))) ∧
859 (loopM sig M i (mk_config ?? q t) = None ? →
860 loopM ? (mk_binaryTM sig M) k
861 (mk_config ?? (state_bin_lift ? M q) (tape_bin_lift ? t)) = None ?)).
862 #sig #M #i #tf #qf #Hcrd elim i
863 [ #t #q %{O} % // % // change with (None ?) in ⊢ (??%?→?); #H destruct (H)
864 | -i #i #IH #t #q >loopM_unfold
865 lapply (refl ? (halt sig M (cstate ?? (mk_config ?? q t))))
866 cases (halt ?? q) in ⊢ (???%→?); #Hhalt
868 >(loop_S_true ??? (λc.halt ?? (cstate ?? c)) (mk_config ?? q t) Hhalt) %
870 #H destruct (H) >loopM_unfold >loop_S_true // ]
871 (* interesting case: more than one step *)
872 >(loop_S_false ??? (λc.halt ?? (cstate ?? c)) (mk_config ?? q t) Hhalt)cases (current_None_or_midtape ? t)
873 (*** current = None ***)
874 [ #Hcur lapply (current_tape_bin_list … Hcur) #Hcur'
875 cut (∃qn,chn,mv.〈qn,chn,mv〉 = trans ? M 〈q,None ?〉)
876 [ cases (trans ? M 〈q,None ?〉) * #qn #chn #mv /4 by ex_intro/ ]
877 * #qn * #chn * #mv cases chn -chn
878 [ #Htrans lapply (binaryTM_phase0_None_None … (None ?) (FS_crd sig) … Hhalt Hcur' Htrans) // [/2 by monotonic_lt_plus_l/]
879 lapply (binaryTM_phase3 ? M qn (None ?) (displ2_of_move sig mv) ? (tape_move FinBool (tape_bin_lift sig t) (mv_tech mv))) [//]
880 cases (IH (tape_move ? t mv) qn) -IH #k0 * #Hk0 * #IH #IHNone
881 #phase3 #phase0 %{(S (S (displ2_of_move sig mv))+k0)} %
882 [ @le_S_S @(le_plus O) // ]
883 >state_bin_lift_unfold >phase0 [|//]
885 >(?: S (S (displ2_of_move sig mv))+k0-1-S (displ2_of_move sig mv) = k0)
886 [| /2 by refl, plus_to_minus/ ]
887 cut (tape_move sig t mv=tape_move sig (tape_write sig t (None sig)) mv) [%] #Hcut
888 >(?: iter ? (λt0.tape_move ? t0 L) (displ2_of_move sig mv) (tape_move ? (tape_bin_lift ? t) (mv_tech mv))
889 =tape_bin_lift ? (tape_move ? t mv))
891 [4: #ls #c #rs normalize in ⊢ (%→?); #H destruct (H)
892 | #_ whd in match (tape_bin_lift ??);
893 >tape_move_niltape >iter_tape_move_niltape >tape_move_niltape %
894 | #r0 #rs0 #_ cases mv
895 [ >tape_bin_lift_unfold whd in match (mv_tech L); whd in match (displ2_of_move sig L);
896 whd in match (rev_bin_list ??); whd in match (option_hd ??);
897 whd in match (right ??); >(?: []@bin_list ? (r0::rs0) = bin_char ? r0@bin_list ? rs0) [|%]
898 >tape_move_R_left >hd_tech [| >eq_length_bin_char_FS_crd // ]
899 >tail_tech [| >eq_length_bin_char_FS_crd // ]
900 >iter_tape_move_L_left //
901 | >tape_bin_lift_unfold whd in match (mv_tech R); whd in match (displ2_of_move sig R);
902 whd in match (rev_bin_list ??); whd in match (option_hd ??);
903 whd in match (right ??); >(?: []@bin_list ? (r0::rs0) = bin_char ? r0@bin_list ? rs0) [|%]
904 whd in match (tape_move ? (leftof ???) R);
905 >tape_bin_lift_unfold >left_midtape >opt_bin_char_Some >right_midtape
906 >iter_O >tape_move_R_left >hd_tech [| >eq_length_bin_char_FS_crd // ]
907 >tail_tech [| >eq_length_bin_char_FS_crd // ] //
908 | >tape_bin_lift_unfold % ]
909 | #l0 #ls0 #_ cases mv
910 [ >tape_bin_lift_unfold whd in match (mv_tech L); whd in match (displ2_of_move sig L);
911 whd in match (bin_list ??); >append_nil whd in match (option_hd ??);
912 whd in match (left ??); whd in match (tail ??);
913 whd in match (tape_move ? (rightof ???) L);
914 >(?: rev_bin_list ? (l0::ls0) = reverse ? (bin_char ? l0)@rev_bin_list ? ls0) [|%]
915 >(?:tape_move ? (mk_tape ? ? (None ?) [ ]) R =
916 mk_tape ? (reverse ? (bin_char ? l0)@rev_bin_list ? ls0) (None ?) [ ])
917 [| cases (reverse ? (bin_char ? l0)@rev_bin_list ? ls0) //]
918 >(?:None ? = option_hd ? [ ]) // >iter_tape_move_L [|@eq_length_bin_char_FS_crd]
919 >append_nil >tape_bin_lift_unfold >left_midtape >current_midtape >right_midtape
920 >opt_bin_char_Some >append_nil %
921 | >tape_bin_lift_unfold whd in match (mv_tech R); whd in match (displ2_of_move sig R);
922 whd in match (bin_list ??); >append_nil whd in match (option_hd ??);
923 whd in match (left ??); whd in match (tail ??); >iter_O cases (rev_bin_list ??) //
924 | >tape_bin_lift_unfold % ]
928 [ #Hloop @IH <Hloop @eq_f whd in ⊢ (???%); >Hcur <Htrans @eq_f @Hcut
929 | #Hloop @IHNone <Hloop @eq_f whd in ⊢ (???%); >Hcur <Htrans @eq_f @Hcut ]
931 lapply (binaryTM_phase0_None_Some … (None ?) (FS_crd sig) … Hhalt Hcur' Htrans) // [/2 by monotonic_lt_plus_l/]
933 [ 4: #ls #c #rs normalize in ⊢ (%→?); #H destruct (H)
934 | 2: #r0 #rs0 #_ cut (∃b,bs.bin_char ? r0 = b::bs)
935 [ <(eq_length_bin_char_FS_crd sig r0) in Hcrd; cases (bin_char ? r0)
936 [ cases (not_le_Sn_O O) #H #H1 cases (H H1) |/3 by ex_intro/] ]
938 lapply (binaryTM_phase4_extend ???? (tape_move ? (tape_bin_lift ? (leftof ? r0 rs0)) R) b … Htrans)
939 [ >tape_bin_lift_unfold whd in match (option_hd ??); whd in match (tail ??);
940 whd in match (right ??);
941 >(?:bin_list ? (r0::rs0) = bin_char ? r0@bin_list ? rs0) [|%]
943 cases (binaryTM_phase5 ? M q (None ?) (FS_crd sig) (bin_list ? (r0::rs0)) ?) [|//]
945 lapply (binaryTM_phase2_Some_ow ?? q (None ?) … [ ] ? (bin_list ? (r0::rs0)) Htrans Hcs)
946 lapply (binaryTM_phase3 ? M qn (None ?) (displ_of_move sig mv) ?
947 (mk_tape FinBool (reverse bool (bin_char sig chn)@[])
948 (option_hd FinBool (bin_list sig (r0::rs0))) (tail FinBool (bin_list sig (r0::rs0))))) [//]
949 cases (IH (tape_move ? (tape_write ? (leftof ? r0 rs0) (Some ? chn)) mv) qn) -IH #k0 * #Hk0 * #IH #IHNone
950 #phase3 #phase2 #phase5 #phase4 #phase0
951 %{(1 + 1 + (S (FS_crd sig)) + (S (FS_crd sig)) + S (displ_of_move sig mv) + k0)} %
952 [ @le_S_S @(le_plus O) // ]
953 >state_bin_lift_unfold >phase0 [|//]
955 >(?: loopM ? (mk_binaryTM ??) ? (mk_config ?? 〈q,bin5,None ?,to_initN ???〉 ?) = ?)
956 [|| @(trans_eq ????? (phase5 ??))
958 >tape_bin_lift_unfold whd in match (rev_bin_list ??);
959 whd in match (right ??); whd in match (bin_list ??);
960 <(eq_length_bin_char_FS_crd sig r0) in Hcrd; cases (bin_char ? r0) //
961 cases (not_le_Sn_O O) #H #H1 cases (H H1)
962 | @le_S_S >associative_plus >associative_plus >commutative_plus @(le_plus O) //
965 [|<plus_minus [|//] <plus_minus [|//] <plus_minus [|//] // ]
966 >phase3 [|<plus_minus [|//] <plus_minus [|//] // ]
967 >(?: 1+1+S (FS_crd sig)+S (FS_crd sig)+S (displ_of_move sig mv)+k0-1-1
968 -S (FS_crd sig)-S (FS_crd sig) -S (displ_of_move sig mv) = k0)
969 [|<plus_minus [|//] <plus_minus [|//] // ]
970 -phase0 -phase2 -phase3 -phase4 -phase5 <state_bin_lift_unfold
971 >(?: iter ? (λt0.tape_move ? t0 L) (displ_of_move sig mv)
972 (mk_tape ? (reverse ? (bin_char sig chn)@[])
973 (option_hd FinBool (bin_list sig (r0::rs0)))
974 (tail FinBool (bin_list sig (r0::rs0))))
975 = tape_bin_lift ? (tape_move ? (tape_write ? (leftof ? r0 rs0) (Some ? chn)) mv))
977 [ @IH <Hloop @eq_f whd in ⊢ (???%); <Htrans %
978 | @IHNone <Hloop @eq_f whd in ⊢ (???%); <Htrans % ]
979 | >(?:bin_list ? (r0::rs0) = bin_char ? r0@bin_list ? rs0) [|%]
981 [ >(?:displ_of_move sig L = FS_crd sig+FS_crd sig) [|normalize //]
982 >iter_split >iter_tape_move_L [|@eq_length_bin_char_FS_crd]
983 >hd_tech [|>eq_length_bin_char_FS_crd // ]
984 >tail_tech [|>eq_length_bin_char_FS_crd // ] >iter_tape_move_L_left [|//]
985 whd in match (tape_move ???); >tape_bin_lift_unfold %
986 | normalize in match (displ_of_move ??); >iter_O
987 normalize in match (tape_move ???);
988 >tape_bin_lift_unfold >opt_bin_char_Some
989 >hd_tech [|>eq_length_bin_char_FS_crd // ]
990 >tail_tech [| >eq_length_bin_char_FS_crd // ] %
991 | normalize in match (displ_of_move ??);
992 >iter_tape_move_L [|>eq_length_bin_char_FS_crd // ]
993 normalize in match (tape_move ???); >tape_bin_lift_unfold
994 >opt_bin_char_Some >hd_tech [|>eq_length_bin_char_FS_crd // ]
995 >tail_tech [|>eq_length_bin_char_FS_crd // ] % ]
997 | #_ lapply (binaryTM_phase4_write ? M q (None ?) (niltape ?) (refl ??))
998 lapply (binaryTM_phase2_Some_of ?? q (None ?) … [ ] Htrans)
999 lapply (binaryTM_phase3 ? M qn (None ?) (displ_of_move sig mv) ?
1000 (mk_tape FinBool (reverse bool (bin_char sig chn)@[]) (None ?) [ ])) [//]
1001 cases (IH (tape_move ? (midtape ? [ ] chn [ ]) mv) qn) -IH #k0 * #Hk0 * #IH #IHNone
1002 #phase3 #phase2 #phase4 #phase0
1003 %{(1 + 1 + (S (FS_crd sig)) + S (displ_of_move sig mv) + k0)} %
1004 [ @le_S_S @(le_plus O) // ]
1005 >state_bin_lift_unfold >phase0 [|//]
1007 >phase2 [| <plus_minus [|//] // ]
1008 >phase3 [| <plus_minus [|//] <plus_minus [|//] // ]
1009 >(?: 1+1+S (FS_crd sig) + S (displ_of_move sig mv)+k0-1-1
1010 -S (FS_crd sig)-S (displ_of_move sig mv) = k0)
1011 [| <plus_minus [|//] <plus_minus [|//] // ]
1012 -phase0 -phase2 -phase3 -phase4 <state_bin_lift_unfold
1013 >(?: iter ? (λt0.tape_move ? t0 L) (displ_of_move sig mv)
1014 (mk_tape ? (reverse ? (bin_char sig chn)@[]) (None ?) [ ])
1015 = tape_bin_lift ? (tape_move ? (tape_write ? (niltape ?) (Some ? chn)) mv))
1017 [ @IH <Hloop @eq_f whd in ⊢ (???%); <Htrans %
1018 | @IHNone <Hloop @eq_f whd in ⊢ (???%); <Htrans % ]
1020 [ >(?:displ_of_move sig L = FS_crd sig+FS_crd sig) [|normalize //]
1021 >iter_split change with (mk_tape ?? (option_hd ? [ ]) (tail ? [ ])) in ⊢ (??(????(????%))?);
1022 >iter_tape_move_L [| >eq_length_bin_char_FS_crd // ]
1023 >append_nil in ⊢ (??(????(???%?))?);
1024 >tail_tech [| >eq_length_bin_char_FS_crd // ]
1025 >iter_tape_move_L_left [|//]
1026 normalize in match (tape_move ???);
1027 >tape_bin_lift_unfold %
1028 | normalize in match (displ_of_move ??); >iter_O
1029 normalize in match (tape_move ???);
1030 >tape_bin_lift_unfold %
1031 | normalize in match (displ_of_move ??);
1032 change with (mk_tape ?? (option_hd ? [ ]) (tail ? [ ])) in ⊢ (??(????%)?);
1033 >iter_tape_move_L [|>eq_length_bin_char_FS_crd // ]
1034 normalize in match (tape_move ???); >tape_bin_lift_unfold
1035 >opt_bin_char_Some >hd_tech [|>eq_length_bin_char_FS_crd // ]
1036 >tail_tech [|>eq_length_bin_char_FS_crd // ] % ]
1038 | #l0 #ls0 #_ lapply (binaryTM_phase4_write ? M q (None ?) (tape_bin_lift ? (rightof ? l0 ls0)) ?)
1039 [ >tape_bin_lift_unfold >current_mk_tape % ]
1040 lapply (binaryTM_phase2_Some_of ?? q (None ?) … (rev_bin_list ? (l0::ls0)) Htrans)
1041 lapply (binaryTM_phase3 ? M qn (None ?) (displ_of_move sig mv) ?
1042 (mk_tape FinBool (reverse bool (bin_char sig chn)@rev_bin_list ? (l0::ls0)) (None ?) [ ])) [//]
1043 cases (IH (tape_move ? (midtape ? (l0::ls0) chn [ ]) mv) qn) -IH #k0 * #Hk0 * #IH #IHNone
1044 #phase3 #phase2 #phase4 #phase0
1045 %{(1 + 1 + (S (FS_crd sig)) + S (displ_of_move sig mv) + k0)} %
1046 [ @le_S_S @(le_plus O) // ]
1047 >state_bin_lift_unfold >phase0 [|//]
1048 >(?:tape_move ? (tape_bin_lift ? (rightof ? l0 ls0)) R = tape_bin_lift ? (rightof ? l0 ls0))
1049 [| >tape_bin_lift_unfold normalize in match (option_hd ??); normalize in match (right ??);
1050 normalize in match (tail ??); normalize in match (left ??);
1051 >(?:rev_bin_list ? (l0::ls0) = reverse ? (bin_char ? l0)@rev_bin_list ? ls0) [|%]
1052 cases (reverse ? (bin_char ? l0)) // cases (rev_bin_list ? ls0) // ]
1054 >phase2 [|<plus_minus [|//] // ]
1055 >phase3 [|<plus_minus [|//] <plus_minus [|//] // ]
1056 >(?: 1+1+S (FS_crd sig) + S (displ_of_move sig mv)+k0-1-1
1057 -S (FS_crd sig)-S (displ_of_move sig mv) = k0)
1058 [| <plus_minus [|//] <plus_minus [|//] // ]
1059 -phase0 -phase2 -phase3 -phase4 <state_bin_lift_unfold
1060 >(?: iter ? (λt0.tape_move ? t0 L) (displ_of_move sig mv)
1061 (mk_tape ? (reverse ? (bin_char sig chn)@rev_bin_list ? (l0::ls0)) (None ?) [ ])
1062 = tape_bin_lift ? (tape_move ? (tape_write ? (rightof ? l0 ls0) (Some ? chn)) mv))
1064 [ @IH <Hloop @eq_f whd in ⊢ (???%); <Htrans %
1065 | @IHNone <Hloop @eq_f whd in ⊢ (???%); <Htrans % ]
1067 [ >(?:displ_of_move sig L = FS_crd sig+FS_crd sig) [|normalize //]
1068 >iter_split change with (mk_tape ?? (option_hd ? [ ]) (tail ? [ ])) in ⊢ (??(????(????%))?);
1069 >iter_tape_move_L [|>eq_length_bin_char_FS_crd // ]
1070 >append_nil in ⊢ (??(????(???%?))?); >tail_tech [|>eq_length_bin_char_FS_crd // ]
1071 >(?:rev_bin_list ? (l0::ls0) = reverse ? (bin_char ? l0)@rev_bin_list ? ls0) [|%]
1072 >append_nil >iter_tape_move_L [|>eq_length_bin_char_FS_crd // ]
1073 normalize in match (tape_move ???);
1074 >tape_bin_lift_unfold @eq_f2
1075 [ >hd_tech [|>eq_length_bin_char_FS_crd // ] %
1076 | >tail_tech [|>eq_length_bin_char_FS_crd // ] >opt_bin_char_Some
1077 normalize in match (bin_list ??); >append_nil %]
1078 | normalize in match (displ_of_move ??); >iter_O
1079 normalize in match (tape_move ???);
1080 >tape_bin_lift_unfold %
1081 | normalize in match (displ_of_move ??);
1082 change with (mk_tape ?? (option_hd ? [ ]) (tail ? [ ])) in ⊢ (??(????%)?);
1083 >iter_tape_move_L [|>eq_length_bin_char_FS_crd // ]
1084 normalize in match (tape_move ???); >tape_bin_lift_unfold
1085 >opt_bin_char_Some >hd_tech [|>eq_length_bin_char_FS_crd // ]
1086 >tail_tech [|>eq_length_bin_char_FS_crd // ] % ]
1091 | * #ls * #c * #rs #Ht >Ht
1092 cut (∃qn,chn,mv.〈qn,chn,mv〉 = trans ? M 〈q,Some ? c〉)
1093 [ cases (trans ? M 〈q,Some ? c〉) * #qn #chn #mv /4 by ex_intro/ ]
1094 * #qn * #chn * #mv #Htrans
1095 cut (tape_bin_lift ? t = ?) [| >tape_bin_lift_unfold % ]
1096 >Ht in ⊢ (???%→?); >opt_bin_char_Some >left_midtape >right_midtape #Ht'
1097 lapply (binaryTM_phase0_midtape ?? (tape_bin_lift ? t) q … (None ?) Hcrd Hhalt Ht')
1098 lapply (binaryTM_phase1 ?? q (reverse ? (bin_char ? c)) (rev_bin_list ? ls)
1099 (option_hd ? (bin_list ? rs)) (tail ? (bin_list ? rs)) (Some ? c) ??)
1100 [ cases (bin_list ? rs) // #r0 #rs0 normalize in ⊢ (%→?); #H destruct (H)
1101 | >length_reverse >eq_length_bin_char_FS_crd // |]
1102 >opt_cons_hd_tl >reverse_reverse
1103 cases chn in Htrans; -chn
1105 lapply (binaryTM_phase2_None … Htrans (FS_crd sig) ?
1106 (mk_tape FinBool (rev_bin_list sig ls)
1107 (option_hd FinBool (bin_char sig c@bin_list sig rs))
1108 (tail FinBool (bin_char sig c@bin_list sig rs)))) [//]
1109 lapply (binaryTM_phase3 ? M qn (Some ? c) (displ_of_move sig mv) ?
1110 (mk_tape FinBool (reverse bool (bin_char sig c)@rev_bin_list ? ls)
1111 (option_hd FinBool (bin_list sig rs)) (tail FinBool (bin_list sig rs)))) [//]
1112 cases (IH (tape_move ? (tape_write ? (midtape ? ls c rs) (None ?)) mv) qn) -IH #k0 * #Hk0 * #IH #IHNone
1113 #phase3 #phase2 #phase1 #phase0
1114 %{(S (FS_crd sig) + S (FS_crd sig) + S (FS_crd sig) + S (displ_of_move sig mv) + k0)} %
1115 [ @le_S_S @(le_plus O) // ]
1116 >state_bin_lift_unfold <Ht >phase0 [|//]
1117 >phase1 [|/2 by monotonic_le_minus_l/]
1118 >phase2 [|/2 by monotonic_le_minus_l/]
1119 >iter_tape_move_R [|>eq_length_bin_char_FS_crd // ]
1120 >phase3 [|/2 by monotonic_le_minus_l/]
1121 -phase0 -phase1 -phase2 -phase3
1122 >(?: S (FS_crd sig) + S (FS_crd sig) + S (FS_crd sig) + S (displ_of_move sig mv) + k0
1123 - S (FS_crd sig) - S (FS_crd sig) - S (FS_crd sig) - S (displ_of_move sig mv)
1124 = k0) [| <plus_minus [|//] <plus_minus [|//] <plus_minus [|//] // ]
1125 <state_bin_lift_unfold
1126 >(?: iter ? (λt0.tape_move ? t0 L) (displ_of_move sig mv)
1127 (mk_tape ? (reverse ? (bin_char sig c)@rev_bin_list ? ls)
1128 (option_hd ? (bin_list ? rs)) (tail ? (bin_list ? rs)))
1129 = tape_bin_lift ? (tape_move ? (tape_write ? (midtape ? ls c rs) (None ?)) mv))
1131 [ @IH <Hloop @eq_f whd in ⊢ (???%); >Ht <Htrans %
1132 | @IHNone <Hloop @eq_f whd in ⊢ (???%); >Ht <Htrans % ]
1133 | normalize in match (tape_write ???); cases mv in Htrans; #Htrans
1134 [ >(?:displ_of_move sig L = FS_crd sig+FS_crd sig) [|normalize //]
1135 >iter_split >iter_tape_move_L [| >eq_length_bin_char_FS_crd // ]
1137 [ >hd_tech [|>eq_length_bin_char_FS_crd // ]
1138 >tail_tech [|>eq_length_bin_char_FS_crd // ]
1139 >iter_tape_move_L_left [|//]
1140 >tape_bin_lift_unfold %
1141 | #l0 #ls0 >(?:rev_bin_list ? (l0::ls0) = reverse ? (bin_char ? l0)@rev_bin_list ? ls0) [|%]
1142 normalize in match (tape_move ???);
1143 >iter_tape_move_L [|>eq_length_bin_char_FS_crd // ]
1144 >hd_tech [|>eq_length_bin_char_FS_crd // ]
1145 >tail_tech [|>eq_length_bin_char_FS_crd // ]
1146 >tape_bin_lift_unfold % ]
1147 | normalize in match (displ_of_move ??); >iter_O cases rs
1148 [ normalize in match (tape_move ???); >tape_bin_lift_unfold %
1149 | #r0 #rs0 normalize in match (tape_move ???);
1150 >tape_bin_lift_unfold >opt_bin_char_Some
1151 >left_midtape >right_midtape
1152 >(?:bin_list ? (r0::rs0) = bin_char ? r0@bin_list ? rs0) [|%]
1153 >hd_tech [|>eq_length_bin_char_FS_crd // ]
1154 >tail_tech [|>eq_length_bin_char_FS_crd // ] %
1156 | normalize in match (displ_of_move ??); >iter_tape_move_L
1157 [|>eq_length_bin_char_FS_crd // ]
1158 >hd_tech [|>eq_length_bin_char_FS_crd // ]
1159 >tail_tech [|>eq_length_bin_char_FS_crd // ] >tape_bin_lift_unfold %
1163 lapply (binaryTM_phase2_Some_ow ?? q (Some ? c) ??? (rev_bin_list ? ls) (bin_char ? c) (bin_list ? rs) Htrans ?)
1164 [>eq_length_bin_char_FS_crd // ]
1165 lapply (binaryTM_phase3 ? M qn (Some ? c) (displ_of_move sig mv) ?
1166 (mk_tape FinBool (reverse bool (bin_char sig chn)@rev_bin_list ? ls)
1167 (option_hd FinBool (bin_list sig rs)) (tail FinBool (bin_list sig rs)))) [//]
1168 cases (IH (tape_move ? (tape_write ? (midtape ? ls c rs) (Some ? chn)) mv) qn) -IH #k0 * #Hk0 * #IH #IHNone
1169 #phase3 #phase2 #phase1 #phase0
1170 %{(S (FS_crd sig) + S (FS_crd sig) + S (FS_crd sig) + S (displ_of_move sig mv) + k0)} %
1171 [ @le_S_S @(le_plus O) // ]
1172 >state_bin_lift_unfold <Ht >phase0 [|//]
1173 >phase1 [|/2 by monotonic_le_minus_l/]
1174 >phase2 [|/2 by monotonic_le_minus_l/]
1175 >phase3 [|/2 by monotonic_le_minus_l/]
1176 -phase0 -phase1 -phase2 -phase3
1177 >(?: S (FS_crd sig) + S (FS_crd sig) + S (FS_crd sig) + S (displ_of_move sig mv) + k0
1178 - S (FS_crd sig) - S (FS_crd sig) - S (FS_crd sig) - S (displ_of_move sig mv)
1180 [| <plus_minus [|//] <plus_minus [|//] <plus_minus [|//] // ]
1181 <state_bin_lift_unfold
1182 >(?: iter ? (λt0.tape_move ? t0 L) (displ_of_move sig mv)
1183 (mk_tape ? (reverse ? (bin_char sig chn)@rev_bin_list ? ls)
1184 (option_hd ? (bin_list ? rs)) (tail ? (bin_list ? rs)))
1185 = tape_bin_lift ? (tape_move ? (tape_write ? (midtape ? ls c rs) (Some ? chn)) mv))
1187 [ @IH <Hloop @eq_f whd in ⊢ (???%); >Ht <Htrans %
1188 | @IHNone <Hloop @eq_f whd in ⊢ (???%); >Ht <Htrans % ]
1189 | normalize in match (tape_write ???); cases mv in Htrans; #Htrans
1190 [ >(?:displ_of_move sig L = FS_crd sig+FS_crd sig) [|normalize //]
1191 >iter_split >iter_tape_move_L [|>eq_length_bin_char_FS_crd // ]
1193 [ >hd_tech [|>eq_length_bin_char_FS_crd // ]
1194 >tail_tech [|>eq_length_bin_char_FS_crd // ] >iter_tape_move_L_left [|//]
1195 >tape_bin_lift_unfold %
1196 | #l0 #ls0 >(?:rev_bin_list ? (l0::ls0) = reverse ? (bin_char ? l0)@rev_bin_list ? ls0) [|%]
1197 normalize in match (tape_move ???);
1198 >iter_tape_move_L [|>eq_length_bin_char_FS_crd // ]
1199 >hd_tech [|>eq_length_bin_char_FS_crd // ]
1200 >tail_tech [|>eq_length_bin_char_FS_crd // ]
1201 >tape_bin_lift_unfold % ]
1202 | normalize in match (displ_of_move ??); >iter_O cases rs
1203 [ normalize in match (tape_move ???); >tape_bin_lift_unfold %
1204 | #r0 #rs0 normalize in match (tape_move ???);
1205 >tape_bin_lift_unfold >opt_bin_char_Some
1206 >left_midtape >right_midtape
1207 >(?:bin_list ? (r0::rs0) = bin_char ? r0@bin_list ? rs0) [|%]
1208 >hd_tech [|>eq_length_bin_char_FS_crd // ]
1209 >tail_tech [|>eq_length_bin_char_FS_crd // ] %
1211 | normalize in match (displ_of_move ??); >iter_tape_move_L [|>eq_length_bin_char_FS_crd // ]
1212 >hd_tech [|>eq_length_bin_char_FS_crd // ]
1213 >tail_tech [|>eq_length_bin_char_FS_crd // ] >tape_bin_lift_unfold %
1221 definition R_bin_lift ≝ λsig,R,t1,t2.
1222 ∀u1.t1 = tape_bin_lift sig u1 →
1223 ∃u2.t2 = tape_bin_lift sig u2 ∧ R u1 u2.
1226 ∀sig,M,i,tf,qf. O < FS_crd sig →
1228 ((loopM sig M i (mk_config ?? q t) = Some ? (mk_config ?? qf tf) →
1229 loopM ? (mk_binaryTM sig M) k
1230 (mk_config ?? (state_bin_lift ? M q) (tape_bin_lift ? t)) =
1231 Some ? (mk_config ?? (state_bin_lift ? M qf) (tape_bin_lift ? tf))) ∧
1232 (loopM sig M i (mk_config ?? q t) = None ? →
1233 loopM ? (mk_binaryTM sig M) k
1234 (mk_config ?? (state_bin_lift ? M q) (tape_bin_lift ? t)) = None ?)).
1236 axiom loop_incr : ∀sig,M,m,n,cfg,cfg'.m ≤ n →
1237 loopM sig M m cfg = Some ? cfg' → loopM sig M n cfg = Some ? cfg'.
1239 theorem sem_binaryTM :
1240 ∀sig,M,R.O < FS_crd sig → M ⊫ R → mk_binaryTM sig M ⊫ R_bin_lift ? R.
1241 #sig #M #R #Hcrd #HM #t #k #outc #Hloopbin #u #Ht
1242 lapply (refl ? (loopM ? M k (initc ? M u))) cases (loopM ? M k (initc ? M u)) in ⊢ (???%→?);
1243 [ #H cases (binaryTM_loop ? M k u (start ? M) Hcrd u (start ? M))
1244 #k0 * #Hlt * #_ #H1 lapply (H1 H) -H -H1 <Ht
1245 whd in match (initc ???) in Hloopbin; whd in match (start ??) in Hloopbin;
1246 >state_bin_lift_unfold >(loop_incr … Hlt Hloopbin) #H destruct (H)
1247 | * #qf #tf #H cases (binaryTM_loop ? M k tf qf Hcrd u (start ? M))
1248 #k0 * #Hlt * #H1 #_ lapply (H1 H) -H1 <Ht
1249 whd in match (initc ???) in Hloopbin; whd in match (start ??) in Hloopbin;
1250 >state_bin_lift_unfold >(loop_incr … Hlt Hloopbin) #Heq destruct (Heq)
1251 % [| % [%]] @(HM … H)