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4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
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15 include "basic_2/grammar/lpx_sn_lpx_sn.ma".
16 include "basic_2/relocation/fsup.ma".
17 include "basic_2/unfold/lpqs_ldrop.ma".
19 (* SN RESTRICTED PARALLEL COMPUTATION FOR LOCAL ENVIRONMENTS ****************)
21 (* Main properties on context-sensitive rest parallel computation for terms *)
23 fact cpqs_conf_lpqs_atom_atom:
24 ∀I,L1,L2. ∃∃T. L1 ⊢ ⓪{I} ➤* T & L2 ⊢ ⓪{I} ➤* T.
27 fact cpqs_conf_lpqs_atom_delta:
29 ∀L,T.♯{L, T} < ♯{L0, #i} →
30 ∀T1. L ⊢ T ➤* T1 → ∀T2. L ⊢ T ➤* T2 →
31 ∀L1. L ⊢ ➤* L1 → ∀L2. L ⊢ ➤* L2 →
32 ∃∃T0. L1 ⊢ T1 ➤* T0 & L2 ⊢ T2 ➤* T0
34 ∀K0,V0. ⇩[O, i] L0 ≡ K0.ⓓV0 →
35 ∀V2. K0 ⊢ V0 ➤* V2 → ∀T2. ⇧[O, i + 1] V2 ≡ T2 →
36 ∀L1. L0 ⊢ ➤* L1 → ∀L2. L0 ⊢ ➤* L2 →
37 ∃∃T. L1 ⊢ #i ➤* T & L2 ⊢ T2 ➤* T.
38 #L0 #i #IH #K0 #V0 #HLK0 #V2 #HV02 #T2 #HVT2 #L1 #HL01 #L2 #HL02
39 elim (lpqs_ldrop_conf … HLK0 … HL01) -HL01 #X1 #H1 #HLK1
40 elim (lpqs_inv_pair1 … H1) -H1 #K1 #V1 #HK01 #HV01 #H destruct
41 elim (lpqs_ldrop_conf … HLK0 … HL02) -HL02 #X2 #H2 #HLK2
42 elim (lpqs_inv_pair1 … H2) -H2 #K2 #W2 #HK02 #_ #H destruct
43 lapply (ldrop_fwd_ldrop2 … HLK2) -W2 #HLK2
44 lapply (ldrop_pair2_fwd_fw … HLK0 (#i)) -HLK0 #HLK0
45 elim (IH … HLK0 … HV01 … HV02 … HK01 … HK02) -L0 -K0 -V0 #V #HV1 #HV2
46 elim (lift_total V 0 (i+1)) #T #HVT
47 lapply (cpqs_lift … HV2 … HLK2 … HVT2 … HVT) -K2 -V2 /3 width=6/
50 fact cpqs_conf_lpqs_delta_delta:
52 ∀L,T.♯{L, T} < ♯{L0, #i} →
53 ∀T1. L ⊢ T ➤* T1 → ∀T2. L ⊢ T ➤* T2 →
54 ∀L1. L ⊢ ➤* L1 → ∀L2. L ⊢ ➤* L2 →
55 ∃∃T0. L1 ⊢ T1 ➤* T0 & L2 ⊢ T2 ➤* T0
57 ∀K0,V0. ⇩[O, i] L0 ≡ K0.ⓓV0 →
58 ∀V1. K0 ⊢ V0 ➤* V1 → ∀T1. ⇧[O, i + 1] V1 ≡ T1 →
59 ∀KX,VX. ⇩[O, i] L0 ≡ KX.ⓓVX →
60 ∀V2. KX ⊢ VX ➤* V2 → ∀T2. ⇧[O, i + 1] V2 ≡ T2 →
61 ∀L1. L0 ⊢ ➤* L1 → ∀L2. L0 ⊢ ➤* L2 →
62 ∃∃T. L1 ⊢ T1 ➤* T & L2 ⊢ T2 ➤* T.
63 #L0 #i #IH #K0 #V0 #HLK0 #V1 #HV01 #T1 #HVT1
64 #KX #VX #H #V2 #HV02 #T2 #HVT2 #L1 #HL01 #L2 #HL02
65 lapply (ldrop_mono … H … HLK0) -H #H destruct
66 elim (lpqs_ldrop_conf … HLK0 … HL01) -HL01 #X1 #H1 #HLK1
67 elim (lpqs_inv_pair1 … H1) -H1 #K1 #W1 #HK01 #_ #H destruct
68 lapply (ldrop_fwd_ldrop2 … HLK1) -W1 #HLK1
69 elim (lpqs_ldrop_conf … HLK0 … HL02) -HL02 #X2 #H2 #HLK2
70 elim (lpqs_inv_pair1 … H2) -H2 #K2 #W2 #HK02 #_ #H destruct
71 lapply (ldrop_fwd_ldrop2 … HLK2) -W2 #HLK2
72 lapply (ldrop_pair2_fwd_fw … HLK0 (#i)) -HLK0 #HLK0
73 elim (IH … HLK0 … HV01 … HV02 … HK01 … HK02) -L0 -K0 -V0 #V #HV1 #HV2
74 elim (lift_total V 0 (i+1)) #T #HVT
75 lapply (cpqs_lift … HV1 … HLK1 … HVT1 … HVT) -K1 -V1
76 lapply (cpqs_lift … HV2 … HLK2 … HVT2 … HVT) -K2 -V2 -V /2 width=3/
79 fact cpqs_conf_lpqs_bind_bind:
81 ∀L,T.♯{L,T} < ♯{L0,ⓑ{a,I}V0.T0} →
82 ∀T1. L ⊢ T ➤* T1 → ∀T2. L ⊢ T ➤* T2 →
83 ∀L1. L ⊢ ➤* L1 → ∀L2. L ⊢ ➤* L2 →
84 ∃∃T0. L1 ⊢ T1 ➤* T0 & L2 ⊢ T2 ➤* T0
86 ∀V1. L0 ⊢ V0 ➤* V1 → ∀T1. L0.ⓑ{I}V0 ⊢ T0 ➤* T1 →
87 ∀V2. L0 ⊢ V0 ➤* V2 → ∀T2. L0.ⓑ{I}V0 ⊢ T0 ➤* T2 →
88 ∀L1. L0 ⊢ ➤* L1 → ∀L2. L0 ⊢ ➤* L2 →
89 ∃∃T. L1 ⊢ ⓑ{a,I}V1.T1 ➤* T & L2 ⊢ ⓑ{a,I}V2.T2 ➤* T.
90 #a #I #L0 #V0 #T0 #IH #V1 #HV01 #T1 #HT01
91 #V2 #HV02 #T2 #HT02 #L1 #HL01 #L2 #HL02
92 elim (IH … HV01 … HV02 … HL01 … HL02) //
93 elim (IH … HT01 … HT02 (L1.ⓑ{I}V1) … (L2.ⓑ{I}V2)) -IH // /2 width=1/ /3 width=5/
96 fact cpqs_conf_lpqs_bind_zeta:
98 ∀L,T.♯{L,T} < ♯{L0,+ⓓV0.T0} →
99 ∀T1. L ⊢ T ➤* T1 → ∀T2. L ⊢ T ➤* T2 →
100 ∀L1. L ⊢ ➤* L1 → ∀L2. L ⊢ ➤* L2 →
101 ∃∃T0. L1 ⊢ T1 ➤* T0 & L2 ⊢ T2 ➤* T0
103 ∀V1. L0 ⊢ V0 ➤* V1 → ∀T1. L0.ⓓV0 ⊢ T0 ➤* T1 →
104 ∀T2. L0.ⓓV0 ⊢ T0 ➤* T2 → ∀X2. ⇧[O, 1] X2 ≡ T2 →
105 ∀L1. L0 ⊢ ➤* L1 → ∀L2. L0 ⊢ ➤* L2 →
106 ∃∃T. L1 ⊢ +ⓓV1.T1 ➤* T & L2 ⊢ X2 ➤* T.
107 #L0 #V0 #T0 #IH #V1 #HV01 #T1 #HT01
108 #T2 #HT02 #X2 #HXT2 #L1 #HL01 #L2 #HL02
109 elim (IH … HT01 … HT02 (L1.ⓓV1) … (L2.ⓓV1)) -IH -HT01 -HT02 // /2 width=1/ -L0 -V0 -T0 #T #HT1 #HT2
110 elim (cpqs_inv_lift1 … HT2 L2 … HXT2) -T2 /2 width=1/ /3 width=3/
113 fact cpqs_conf_lpqs_zeta_zeta:
115 ∀L,T.♯{L,T} < ♯{L0,+ⓓV0.T0} →
116 ∀T1. L ⊢ T ➤* T1 → ∀T2. L ⊢ T ➤* T2 →
117 ∀L1. L ⊢ ➤* L1 → ∀L2. L ⊢ ➤* L2 →
118 ∃∃T0. L1 ⊢ T1 ➤* T0 & L2 ⊢ T2 ➤* T0
120 ∀T1. L0.ⓓV0 ⊢ T0 ➤* T1 → ∀X1. ⇧[O, 1] X1 ≡ T1 →
121 ∀T2. L0.ⓓV0 ⊢ T0 ➤* T2 → ∀X2. ⇧[O, 1] X2 ≡ T2 →
122 ∀L1. L0 ⊢ ➤* L1 → ∀L2. L0 ⊢ ➤* L2 →
123 ∃∃T. L1 ⊢ X1 ➤* T & L2 ⊢ X2 ➤* T.
124 #L0 #V0 #T0 #IH #T1 #HT01 #X1 #HXT1
125 #T2 #HT02 #X2 #HXT2 #L1 #HL01 #L2 #HL02
126 elim (IH … HT01 … HT02 (L1.ⓓV0) … (L2.ⓓV0)) -IH -HT01 -HT02 // /2 width=1/ -L0 -T0 #T #HT1 #HT2
127 elim (cpqs_inv_lift1 … HT1 L1 … HXT1) -T1 /2 width=1/ #T1 #HT1 #HXT1
128 elim (cpqs_inv_lift1 … HT2 L2 … HXT2) -T2 /2 width=1/ #T2 #HT2 #HXT2
129 lapply (lift_inj … HT2 … HT1) -T #H destruct /2 width=3/
132 fact cpqs_conf_lpqs_flat_flat:
134 ∀L,T.♯{L,T} < ♯{L0,ⓕ{I}V0.T0} →
135 ∀T1. L ⊢ T ➤* T1 → ∀T2. L ⊢ T ➤* T2 →
136 ∀L1. L ⊢ ➤* L1 → ∀L2. L ⊢ ➤* L2 →
137 ∃∃T0. L1 ⊢ T1 ➤* T0 & L2 ⊢ T2 ➤* T0
139 ∀V1. L0 ⊢ V0 ➤* V1 → ∀T1. L0 ⊢ T0 ➤* T1 →
140 ∀V2. L0 ⊢ V0 ➤* V2 → ∀T2. L0 ⊢ T0 ➤* T2 →
141 ∀L1. L0 ⊢ ➤* L1 → ∀L2. L0 ⊢ ➤* L2 →
142 ∃∃T. L1 ⊢ ⓕ{I}V1.T1 ➤* T & L2 ⊢ ⓕ{I}V2.T2 ➤* T.
143 #I #L0 #V0 #T0 #IH #V1 #HV01 #T1 #HT01
144 #V2 #HV02 #T2 #HT02 #L1 #HL01 #L2 #HL02
145 elim (IH … HV01 … HV02 … HL01 … HL02) //
146 elim (IH … HT01 … HT02 … HL01 … HL02) // /3 width=5/
149 fact cpqs_conf_lpqs_flat_tau:
151 ∀L,T.♯{L,T} < ♯{L0,ⓝV0.T0} →
152 ∀T1. L ⊢ T ➤* T1 → ∀T2. L ⊢ T ➤* T2 →
153 ∀L1. L ⊢ ➤* L1 → ∀L2. L ⊢ ➤* L2 →
154 ∃∃T0. L1 ⊢ T1 ➤* T0 & L2 ⊢ T2 ➤* T0
156 ∀V1,T1. L0 ⊢ T0 ➤* T1 → ∀T2. L0 ⊢ T0 ➤* T2 →
157 ∀L1. L0 ⊢ ➤* L1 → ∀L2. L0 ⊢ ➤* L2 →
158 ∃∃T. L1 ⊢ ⓝV1.T1 ➤* T & L2 ⊢ T2 ➤* T.
159 #L0 #V0 #T0 #IH #V1 #T1 #HT01
160 #T2 #HT02 #L1 #HL01 #L2 #HL02
161 elim (IH … HT01 … HT02 … HL01 … HL02) // -L0 -V0 -T0 /3 width=3/
164 fact cpqs_conf_lpqs_tau_tau:
166 ∀L,T.♯{L,T} < ♯{L0,ⓝV0.T0} →
167 ∀T1. L ⊢ T ➤* T1 → ∀T2. L ⊢ T ➤* T2 →
168 ∀L1. L ⊢ ➤* L1 → ∀L2. L ⊢ ➤* L2 →
169 ∃∃T0. L1 ⊢ T1 ➤* T0 & L2 ⊢ T2 ➤* T0
171 ∀T1. L0 ⊢ T0 ➤* T1 → ∀T2. L0 ⊢ T0 ➤* T2 →
172 ∀L1. L0 ⊢ ➤* L1 → ∀L2. L0 ⊢ ➤* L2 →
173 ∃∃T. L1 ⊢ T1 ➤* T & L2 ⊢ T2 ➤* T.
174 #L0 #V0 #T0 #IH #T1 #HT01
175 #T2 #HT02 #L1 #HL01 #L2 #HL02
176 elim (IH … HT01 … HT02 … HL01 … HL02) // -L0 -V0 -T0 /2 width=3/
179 theorem cpqs_conf_lpqs: lpx_sn_confluent cpqs cpqs.
180 #L0 #T0 @(f2_ind … fw … L0 T0) -L0 -T0 #n #IH #L0 * [|*]
181 [ #I0 #Hn #T1 #H1 #T2 #H2 #L1 #HL01 #L2 #HL02 destruct
182 elim (cpqs_inv_atom1 … H1) -H1
183 elim (cpqs_inv_atom1 … H2) -H2
185 /2 width=1 by cpqs_conf_lpqs_atom_atom/
186 | * #K0 #V0 #V2 #i2 #HLK0 #HV02 #HVT2 #H2 #H1 destruct
187 /3 width=10 by cpqs_conf_lpqs_atom_delta/
188 | #H2 * #K0 #V0 #V1 #i1 #HLK0 #HV01 #HVT1 #H1 destruct
189 /4 width=10 by ex2_commute, cpqs_conf_lpqs_atom_delta/
190 | * #X #Y #V2 #z #H #HV02 #HVT2 #H2
191 * #K0 #V0 #V1 #i #HLK0 #HV01 #HVT1 #H1 destruct
192 /3 width=17 by cpqs_conf_lpqs_delta_delta/
194 | #a #I #V0 #T0 #Hn #X1 #H1 #X2 #H2 #L1 #HL01 #L2 #HL02 destruct
195 elim (cpqs_inv_bind1 … H1) -H1 *
196 [ #V1 #T1 #HV01 #HT01 #H1
197 | #T1 #HT01 #HXT1 #H11 #H12
199 elim (cpqs_inv_bind1 … H2) -H2 *
200 [1,3: #V2 #T2 #HV02 #HT02 #H2
201 |2,4: #T2 #HT02 #HXT2 #H21 #H22
203 [ /3 width=10 by cpqs_conf_lpqs_bind_bind/
204 | /4 width=11 by ex2_commute, cpqs_conf_lpqs_bind_zeta/
205 | /3 width=11 by cpqs_conf_lpqs_bind_zeta/
206 | /3 width=12 by cpqs_conf_lpqs_zeta_zeta/
208 | #I #V0 #T0 #Hn #X1 #H1 #X2 #H2 #L1 #HL01 #L2 #HL02 destruct
209 elim (cpqs_inv_flat1 … H1) -H1 *
210 [ #V1 #T1 #HV01 #HT01 #H1
213 elim (cpqs_inv_flat1 … H2) -H2 *
214 [1,3: #V2 #T2 #HV02 #HT02 #H2
217 [ /3 width=10 by cpqs_conf_lpqs_flat_flat/
218 | /4 width=8 by ex2_commute, cpqs_conf_lpqs_flat_tau/
219 | /3 width=8 by cpqs_conf_lpqs_flat_tau/
220 | /3 width=7 by cpqs_conf_lpqs_tau_tau/
225 theorem cpqs_conf: ∀L. confluent … (cpqs L).
226 /2 width=6 by cpqs_conf_lpqs/ qed-.
228 theorem cpqs_trans_lpqs: lpx_sn_transitive cpqs cpqs.
229 #L1 #T1 @(f2_ind … fw … L1 T1) -L1 -T1 #n #IH #L1 * [|*]
230 [ #I #Hn #T #H1 #L2 #HL12 #T2 #HT2 destruct
231 elim (cpqs_inv_atom1 … H1) -H1
233 elim (cpqs_inv_atom1 … HT2) -HT2
235 | * #K2 #V #V2 #i #HLK2 #HV2 #HVT2 #H destruct
236 elim (lpqs_ldrop_trans_O1 … HL12 … HLK2) -L2 #X #HLK1 #H
237 elim (lpqs_inv_pair2 … H) -H #K1 #V1 #HK12 #HV1 #H destruct
238 lapply (ldrop_pair2_fwd_fw … HLK1 (#i)) /3 width=9/
240 | * #K1 #V1 #V #i #HLK1 #HV1 #HVT #H destruct
241 elim (lpqs_ldrop_conf … HLK1 … HL12) -HL12 #X #H #HLK2
242 elim (lpqs_inv_pair1 … H) -H #K2 #W2 #HK12 #_ #H destruct
243 lapply (ldrop_fwd_ldrop2 … HLK2) -W2 #HLK2
244 elim (cpqs_inv_lift1 … HT2 … HLK2 … HVT) -L2 -T
245 lapply (ldrop_pair2_fwd_fw … HLK1 (#i)) /3 width=9/
247 | #a #I #V1 #T1 #Hn #X1 #H1 #L2 #HL12 #X2 #H2
248 elim (cpqs_inv_bind1 … H1) -H1 *
249 [ #V #T #HV1 #HT1 #H destruct
250 elim (cpqs_inv_bind1 … H2) -H2 *
251 [ #V2 #T2 #HV2 #HT2 #H destruct /4 width=5/
252 | #T2 #HT2 #HXT2 #H1 #H2 destruct /4 width=5/
254 | #Y1 #HTY1 #HXY1 #H11 #H12 destruct
255 elim (lift_total X2 0 1) #Y2 #HXY2
256 lapply (cpqs_lift … H2 (L2.ⓓV1) … HXY1 … HXY2) /2 width=1/ -X1 /4 width=5/
258 | #I #V1 #T1 #Hn #X1 #H1 #L2 #HL12 #X2 #H2
259 elim (cpqs_inv_flat1 … H1) -H1 *
260 [ #V #T #HV1 #HT1 #H destruct
261 elim (cpqs_inv_flat1 … H2) -H2 *
262 [ #V2 #T2 #HV2 #HT2 #H destruct /3 width=5/
263 | #HX2 #H destruct /3 width=5/
265 | #HX1 #H destruct /3 width=5/
269 theorem cpqs_trans: ∀L. Transitive … (cpqs L).
270 /2 width=5 by cpqs_trans_lpqs/ qed-.
272 (* Properties on context-sensitive rest. parallel computation for terms *****)
274 lemma lpqs_cpqs_conf_dx: ∀L0,T0,T1. L0 ⊢ T0 ➤* T1 → ∀L1. L0 ⊢ ➤* L1 →
275 ∃∃T. L1 ⊢ T0 ➤* T & L1 ⊢ T1 ➤* T.
276 #L0 #T0 #T1 #HT01 #L1 #HL01
277 elim (cpqs_conf_lpqs … HT01 T0 … HL01 … HL01) // -L0 /2 width=3/
280 lemma lpqs_cpqs_conf_sn: ∀L0,T0,T1. L0 ⊢ T0 ➤* T1 → ∀L1. L0 ⊢ ➤* L1 →
281 ∃∃T. L1 ⊢ T0 ➤* T & L0 ⊢ T1 ➤* T.
282 #L0 #T0 #T1 #HT01 #L1 #HL01
283 elim (cpqs_conf_lpqs … HT01 T0 … L0 … HL01) // -HT01 -HL01 /2 width=3/
286 lemma lpqs_cpqs_trans: ∀L1,L2. L1 ⊢ ➤* L2 →
287 ∀T1,T2. L2 ⊢ T1 ➤* T2 → L1 ⊢ T1 ➤* T2.
288 /2 width=5 by cpqs_trans_lpqs/ qed-.
290 lemma fsup_cpqs_trans: ∀L1,L2,T1,T2. ⦃L1, T1⦄ ⊃ ⦃L2, T2⦄ → ∀U2. L2 ⊢ T2 ➤* U2 →
291 ∃∃L,U1. L1 ⊢ ➤* L & L ⊢ T1 ➤* U1 & ⦃L, U1⦄ ⊃ ⦃L2, U2⦄.
292 #L1 #L2 #T1 #T2 #H elim H -L1 -L2 -T1 -T2 [1,2,3,4,5: /3 width=5/ ]
293 #L1 #K1 #K2 #T1 #T2 #U1 #d #e #HLK1 #HTU1 #_ #IHT12 #U2 #HTU2
294 elim (IHT12 … HTU2) -IHT12 -HTU2 #K #T #HK1 #HT1 #HT2
295 elim (lift_total T d e) #U #HTU
296 elim (ldrop_lpqs_trans … HLK1 … HK1) -HLK1 -HK1 #L2 #HL12 #HL2K
297 lapply (cpqs_lift … HT1 … HL2K … HTU1 … HTU) -HT1 -HTU1 /3 width=11/