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15 include "basic_2/notation/relations/pconveta_5.ma".
16 include "basic_2/rt_computation/cpms.ma".
18 (* CONTEXT-SENSITIVE PARALLEL ETA-CONVERSION FOR TERMS **********************)
21 inductive cpce (h): relation4 genv lenv term term ≝
22 | cpce_sort: ∀G,L,s. cpce h G L (⋆s) (⋆s)
23 | cpce_atom: ∀G,i. cpce h G (⋆) (#i) (#i)
24 | cpce_unit: ∀I,G,K. cpce h G (K.ⓤ{I}) (#0) (#0)
25 | cpce_ldef: ∀G,K,V. cpce h G (K.ⓓV) (#0) (#0)
26 | cpce_ldec: ∀G,K,W. (∀n,p,V,U. ⦃G,K⦄ ⊢ W ➡*[n,h] ⓛ{p}V.U → ⊥) →
27 cpce h G (K.ⓛW) (#0) (#0)
28 | cpce_eta : ∀n,p,G,K,W,W1,W2,V,V1,V2,U. ⦃G,K⦄ ⊢ W ➡*[n,h] ⓛ{p}V.U →
29 cpce h G K W W1 → ⇧*[1] W1 ≘ W2 →
30 cpce h G K V V1 → ⇧*[1] V1 ≘ V2 →
31 cpce h G (K.ⓛW) (#0) (ⓝW2.+ⓛV2.ⓐ#0.#1)
32 | cpce_lref: ∀I,G,K,T,U,i. cpce h G K (#i) T →
33 ⇧*[1] T ≘ U → cpce h G (K.ⓘ{I}) (#↑i) U
34 | cpce_gref: ∀G,L,l. cpce h G L (§l) (§l)
35 | cpce_bind: ∀p,I,G,K,V1,V2,T1,T2.
36 cpce h G K V1 V2 → cpce h G (K.ⓑ{I}V1) T1 T2 →
37 cpce h G K (ⓑ{p,I}V1.T1) (ⓑ{p,I}V2.T2)
38 | cpce_flat: ∀I,G,L,V1,V2,T1,T2.
39 cpce h G L V1 V2 → cpce h G L T1 T2 →
40 cpce h G L (ⓕ{I}V1.T1) (ⓕ{I}V2.T2)
44 "context-sensitive parallel eta-conversion (term)"
45 'PConvEta h G L T1 T2 = (cpce h G L T1 T2).
47 (* Basic inversion lemmas ***************************************************)
49 lemma cpce_inv_sort_sn (h) (G) (L) (s):
50 ∀X2. ⦃G,L⦄ ⊢ ⋆s ⬌η[h] X2 → ⋆s = X2.
52 @(insert_eq_0 … (⋆s0)) #X1 * -G -Y -X1 -X2
58 | #n #p #G #K #W #W1 #W2 #V #V1 #V2 #U #_ #_ #_ #_ #_ #H destruct
59 | #I #G #K #T #U #i #_ #_ #H destruct
61 | #p #I #G #K #V1 #V2 #T1 #T2 #_ #_ #H destruct
62 | #I #G #L #V1 #V2 #T1 #T2 #_ #_ #H destruct
66 lemma cpce_inv_atom_sn (h) (G) (i):
67 ∀X2. ⦃G,⋆⦄ ⊢ #i ⬌η[h] X2 → #i = X2.
69 @(insert_eq_0 … LAtom) #Y
70 @(insert_eq_0 … (#i0)) #X1
76 | #G #K #W #_ #_ #_ //
77 | #n #p #G #K #W #W1 #W2 #V #V1 #V2 #U #_ #_ #_ #_ #_ #_ #H destruct
78 | #I #G #K #T #U #i #_ #_ #_ #H destruct
80 | #p #I #G #K #V1 #V2 #T1 #T2 #_ #_ #H #_ destruct
81 | #I #G #L #V1 #V2 #T1 #T2 #_ #_ #H #_ destruct
85 lemma cpce_inv_unit_sn (h) (I) (G) (K):
86 ∀X2. ⦃G,K.ⓤ{I}⦄ ⊢ #0 ⬌η[h] X2 → #0 = X2.
88 @(insert_eq_0 … (K0.ⓤ{I0})) #Y
89 @(insert_eq_0 … (#0)) #X1
95 | #G #K #W #_ #_ #_ //
96 | #n #p #G #K #W #W1 #W2 #V #V1 #V2 #U #_ #_ #_ #_ #_ #_ #H destruct
97 | #I #G #K #T #U #i #_ #_ #H #_ destruct
99 | #p #I #G #K #V1 #V2 #T1 #T2 #_ #_ #H #_ destruct
100 | #I #G #L #V1 #V2 #T1 #T2 #_ #_ #H #_ destruct
104 lemma cpce_inv_ldef_sn (h) (G) (K) (V):
105 ∀X2. ⦃G,K.ⓓV⦄ ⊢ #0 ⬌η[h] X2 → #0 = X2.
107 @(insert_eq_0 … (K0.ⓓV0)) #Y
108 @(insert_eq_0 … (#0)) #X1
114 | #G #K #W #_ #_ #_ //
115 | #n #p #G #K #W #W1 #W2 #V #V1 #V2 #U #_ #_ #_ #_ #_ #_ #H destruct
116 | #I #G #K #T #U #i #_ #_ #H #_ destruct
118 | #p #I #G #K #V1 #V2 #T1 #T2 #_ #_ #H #_ destruct
119 | #I #G #L #V1 #V2 #T1 #T2 #_ #_ #H #_ destruct
123 lemma cpce_inv_ldec_sn (h) (G) (K) (W):
124 ∀X2. ⦃G,K.ⓛW⦄ ⊢ #0 ⬌η[h] X2 →
125 ∨∨ ∧∧ ∀n,p,V,U. ⦃G,K⦄ ⊢ W ➡*[n,h] ⓛ{p}V.U → ⊥ & #0 = X2
126 | ∃∃n,p,W1,W2,V,V1,V2,U. ⦃G,K⦄ ⊢ W ➡*[n,h] ⓛ{p}V.U
127 & ⦃G,K⦄ ⊢ W ⬌η[h] W1 & ⇧*[1] W1 ≘ W2
128 & ⦃G,K⦄ ⊢ V ⬌η[h] V1 & ⇧*[1] V1 ≘ V2
129 & ⓝW2.+ⓛV2.ⓐ#0.#1 = X2.
131 @(insert_eq_0 … (K0.ⓛW0)) #Y
132 @(insert_eq_0 … (#0)) #X1
134 [ #G #L #s #H #_ destruct
135 | #G #i #_ #H destruct
136 | #I #G #K #_ #H destruct
137 | #G #K #V #_ #H destruct
138 | #G #K #W #HW #_ #H destruct /4 width=5 by or_introl, conj/
139 | #n #p #G #K #W #W1 #W2 #V #V1 #V2 #U #HWU #HW1 #HW12 #HV1 #HV12 #_ #H destruct
140 /3 width=14 by or_intror, ex6_8_intro/
141 | #I #G #K #T #U #i #_ #_ #H #_ destruct
142 | #G #L #l #H #_ destruct
143 | #p #I #G #K #V1 #V2 #T1 #T2 #_ #_ #H #_ destruct
144 | #I #G #L #V1 #V2 #T1 #T2 #_ #_ #H #_ destruct
148 lemma cpce_inv_lref_sn (h) (I) (G) (K) (i):
149 ∀X2. ⦃G,K.ⓘ{I}⦄ ⊢ #↑i ⬌η[h] X2 →
150 ∃∃T2. ⦃G,K⦄ ⊢ #i ⬌η[h] T2 & ⇧*[1] T2 ≘ X2.
151 #h #I0 #G #K0 #i0 #X2
152 @(insert_eq_0 … (K0.ⓘ{I0})) #Y
153 @(insert_eq_0 … (#↑i0)) #X1
155 [ #G #L #s #H #_ destruct
156 | #G #i #_ #H destruct
157 | #I #G #K #H #_ destruct
158 | #G #K #V #H #_ destruct
159 | #G #K #W #_ #H #_ destruct
160 | #n #p #G #K #W #W1 #W2 #V #V1 #V2 #U #_ #_ #_ #_ #_ #H #_ destruct
161 | #I #G #K #T #U #i #Hi #HTU #H1 #H2 destruct /2 width=3 by ex2_intro/
162 | #G #L #l #H #_ destruct
163 | #p #I #G #K #V1 #V2 #T1 #T2 #_ #_ #H #_ destruct
164 | #I #G #L #V1 #V2 #T1 #T2 #_ #_ #H #_ destruct
168 lemma cpce_inv_gref_sn (h) (G) (L) (l):
169 ∀X2. ⦃G,L⦄ ⊢ §l ⬌η[h] X2 → §l = X2.
171 @(insert_eq_0 … (§l0)) #X1 * -G -Y -X1 -X2
177 | #n #p #G #K #W #W1 #W2 #V #V1 #V2 #U #_ #_ #_ #_ #_ #H destruct
178 | #I #G #K #T #U #i #_ #_ #H destruct
180 | #p #I #G #K #V1 #V2 #T1 #T2 #_ #_ #H destruct
181 | #I #G #L #V1 #V2 #T1 #T2 #_ #_ #H destruct
185 lemma cpce_inv_bind_sn (h) (p) (I) (G) (K) (V1) (T1):
186 ∀X2. ⦃G,K⦄ ⊢ ⓑ{p,I}V1.T1 ⬌η[h] X2 →
187 ∃∃V2,T2. ⦃G,K⦄ ⊢ V1 ⬌η[h] V2 & ⦃G,K.ⓑ{I}V1⦄ ⊢ T1 ⬌η[h] T2 & ⓑ{p,I}V2.T2 = X2.
188 #h #p0 #I0 #G #Y #V0 #T0 #X2
189 @(insert_eq_0 … (ⓑ{p0,I0}V0.T0)) #X1 * -G -Y -X1 -X2
190 [ #G #L #s #H destruct
192 | #I #G #K #H destruct
193 | #G #K #V #H destruct
194 | #G #K #W #_ #H destruct
195 | #n #p #G #K #W #W1 #W2 #V #V1 #V2 #U #_ #_ #_ #_ #_ #H destruct
196 | #I #G #K #T #U #i #_ #_ #H destruct
197 | #G #L #l #H destruct
198 | #p #I #G #K #V1 #V2 #T1 #T2 #HV #HT #H destruct /2 width=5 by ex3_2_intro/
199 | #I #G #L #V1 #V2 #T1 #T2 #_ #_ #H destruct
203 lemma cpce_inv_flat_sn (h) (I) (G) (L) (V1) (T1):
204 ∀X2. ⦃G,L⦄ ⊢ ⓕ{I}V1.T1 ⬌η[h] X2 →
205 ∃∃V2,T2. ⦃G,L⦄ ⊢ V1 ⬌η[h] V2 & ⦃G,L⦄ ⊢ T1 ⬌η[h] T2 & ⓕ{I}V2.T2 = X2.
206 #h #I0 #G #Y #V0 #T0 #X2
207 @(insert_eq_0 … (ⓕ{I0}V0.T0)) #X1 * -G -Y -X1 -X2
208 [ #G #L #s #H destruct
210 | #I #G #K #H destruct
211 | #G #K #V #H destruct
212 | #G #K #W #_ #H destruct
213 | #n #p #G #K #W #W1 #W2 #V #V1 #V2 #U #_ #_ #_ #_ #_ #H destruct
214 | #I #G #K #T #U #i #_ #_ #H destruct
215 | #G #L #l #H destruct
216 | #p #I #G #L #V1 #V2 #T1 #T2 #_ #_ #H destruct
217 | #I #G #K #V1 #V2 #T1 #T2 #HV #HT #H destruct /2 width=5 by ex3_2_intro/