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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 *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
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15 include "basic_2A/substitution/drop_drop.ma".
16 include "basic_2A/multiple/fqus_alt.ma".
17 include "basic_2A/static/da.ma".
18 include "basic_2A/reduction/cpx.ma".
20 (* CONTEXT-SENSITIVE EXTENDED PARALLEL REDUCTION FOR TERMS ******************)
22 (* Advanced properties ******************************************************)
24 fact sta_cpx_aux: ∀h,g,G,L,T1,T2,d2,d1. ⦃G, L⦄ ⊢ T1 •*[h, d2] T2 → d2 = 1 →
25 ⦃G, L⦄ ⊢ T1 ▪[h, g] d1+1 → ⦃G, L⦄ ⊢ T1 ➡[h, g] T2.
26 #h #g #G #L #T1 #T2 #d2 #d1 #H elim H -G -L -T1 -T2 -d2
27 [ #G #L #d2 #k #H0 destruct normalize
28 /3 width=4 by cpx_st, da_inv_sort/
29 | #G #L #K #V1 #V2 #W2 #i #d2 #HLK #_ #HVW2 #IHV12 #H0 #H destruct
30 elim (da_inv_lref … H) -H * #K0 #V0 [| #d0 ] #HLK0
31 lapply (drop_mono … HLK0 … HLK) -HLK0 #H destruct /3 width=7 by cpx_delta/
32 | #G #L #K #V1 #V2 #i #_ #_ #_ #H destruct
33 | #G #L #K #V1 #V2 #W2 #i #d2 #HLK #HV12 #HVW2 #_ #H0 #H
34 lapply (discr_plus_xy_y … H0) -H0 #H0 destruct
35 elim (da_inv_lref … H) -H * #K0 #V0 [| #d0 ] #HLK0
36 lapply (drop_mono … HLK0 … HLK) -HLK0 #H destruct
37 /4 width=7 by cpx_delta, cpr_cpx, lstas_cpr/
38 | /4 width=2 by cpx_bind, da_inv_bind/
39 | /4 width=3 by cpx_flat, da_inv_flat/
40 | /4 width=3 by cpx_eps, da_inv_flat/
44 lemma sta_cpx: ∀h,g,G,L,T1,T2,d. ⦃G, L⦄ ⊢ T1 •*[h, 1] T2 →
45 ⦃G, L⦄ ⊢ T1 ▪[h, g] d+1 → ⦃G, L⦄ ⊢ T1 ➡[h, g] T2.
46 /2 width=3 by sta_cpx_aux/ qed.
48 (* Relocation properties ****************************************************)
50 lemma cpx_lift: ∀h,g,G. d_liftable (cpx h g G).
51 #h #g #G #K #T1 #T2 #H elim H -G -K -T1 -T2
52 [ #I #G #K #L #s #l #m #_ #U1 #H1 #U2 #H2
53 >(lift_mono … H1 … H2) -H1 -H2 //
54 | #G #K #k #d #Hkd #L #s #l #m #_ #U1 #H1 #U2 #H2
55 >(lift_inv_sort1 … H1) -U1
56 >(lift_inv_sort1 … H2) -U2 /2 width=2 by cpx_st/
57 | #I #G #K #KV #V #V2 #W2 #i #HKV #HV2 #HVW2 #IHV2 #L #s #l #m #HLK #U1 #H #U2 #HWU2
58 elim (lift_inv_lref1 … H) * #Hil #H destruct
59 [ elim (lift_trans_ge … HVW2 … HWU2) -W2 // <minus_plus #W2 #HVW2 #HWU2
60 elim (drop_trans_le … HLK … HKV) -K /2 width=2 by lt_to_le/ #X #HLK #H
61 elim (drop_inv_skip2 … H) -H /2 width=1 by lt_plus_to_minus_r/ -Hil
62 #K #Y #HKV #HVY #H destruct /3 width=10 by cpx_delta/
63 | lapply (lift_trans_be … HVW2 … HWU2 ? ?) -W2 /2 width=1 by le_S/ >plus_plus_comm_23 #HVU2
64 lapply (drop_trans_ge_comm … HLK … HKV ?) -K /3 width=7 by cpx_delta, drop_inv_gen/
66 | #a #I #G #K #V1 #V2 #T1 #T2 #_ #_ #IHV12 #IHT12 #L #s #l #m #HLK #U1 #H1 #U2 #H2
67 elim (lift_inv_bind1 … H1) -H1 #VV1 #TT1 #HVV1 #HTT1 #H1 destruct
68 elim (lift_inv_bind1 … H2) -H2 #VV2 #TT2 #HVV2 #HTT2 #H2 destruct /4 width=6 by cpx_bind, drop_skip/
69 | #I #G #K #V1 #V2 #T1 #T2 #_ #_ #IHV12 #IHT12 #L #s #l #m #HLK #U1 #H1 #U2 #H2
70 elim (lift_inv_flat1 … H1) -H1 #VV1 #TT1 #HVV1 #HTT1 #H1 destruct
71 elim (lift_inv_flat1 … H2) -H2 #VV2 #TT2 #HVV2 #HTT2 #H2 destruct /3 width=6 by cpx_flat/
72 | #G #K #V #T1 #T #T2 #_ #HT2 #IHT1 #L #s #l #m #HLK #U1 #H #U2 #HTU2
73 elim (lift_inv_bind1 … H) -H #VV1 #TT1 #HVV1 #HTT1 #H destruct
74 elim (lift_conf_O1 … HTU2 … HT2) -T2 /4 width=6 by cpx_zeta, drop_skip/
75 | #G #K #V #T1 #T2 #_ #IHT12 #L #s #l #m #HLK #U1 #H #U2 #HTU2
76 elim (lift_inv_flat1 … H) -H #VV1 #TT1 #HVV1 #HTT1 #H destruct /3 width=6 by cpx_eps/
77 | #G #K #V1 #V2 #T #_ #IHV12 #L #s #l #m #HLK #U1 #H #U2 #HVU2
78 elim (lift_inv_flat1 … H) -H #VV1 #TT1 #HVV1 #HTT1 #H destruct /3 width=6 by cpx_ct/
79 | #a #G #K #V1 #V2 #W1 #W2 #T1 #T2 #_ #_ #_ #IHV12 #IHW12 #IHT12 #L #s #l #m #HLK #X1 #HX1 #X2 #HX2
80 elim (lift_inv_flat1 … HX1) -HX1 #V0 #X #HV10 #HX #HX1 destruct
81 elim (lift_inv_bind1 … HX) -HX #W0 #T0 #HW0 #HT10 #HX destruct
82 elim (lift_inv_bind1 … HX2) -HX2 #X #T3 #HX #HT23 #HX2 destruct
83 elim (lift_inv_flat1 … HX) -HX #W3 #V3 #HW23 #HV23 #HX destruct /4 width=6 by cpx_beta, drop_skip/
84 | #a #G #K #V1 #V #V2 #W1 #W2 #T1 #T2 #_ #HV2 #_ #_ #IHV1 #IHW12 #IHT12 #L #s #l #m #HLK #X1 #HX1 #X2 #HX2
85 elim (lift_inv_flat1 … HX1) -HX1 #V0 #X #HV10 #HX #HX1 destruct
86 elim (lift_inv_bind1 … HX) -HX #W0 #T0 #HW0 #HT10 #HX destruct
87 elim (lift_inv_bind1 … HX2) -HX2 #W3 #X #HW23 #HX #HX2 destruct
88 elim (lift_inv_flat1 … HX) -HX #V3 #T3 #HV3 #HT23 #HX destruct
89 elim (lift_trans_ge … HV2 … HV3) -V2 /4 width=6 by cpx_theta, drop_skip/
93 lemma cpx_inv_lift1: ∀h,g,G. d_deliftable_sn (cpx h g G).
94 #h #g #G #L #U1 #U2 #H elim H -G -L -U1 -U2
95 [ * #i #G #L #K #s #l #m #_ #T1 #H
96 [ lapply (lift_inv_sort2 … H) -H #H destruct /2 width=3 by cpx_atom, lift_sort, ex2_intro/
97 | elim (lift_inv_lref2 … H) -H * #Hil #H destruct /3 width=3 by cpx_atom, lift_lref_ge_minus, lift_lref_lt, ex2_intro/
98 | lapply (lift_inv_gref2 … H) -H #H destruct /2 width=3 by cpx_atom, lift_gref, ex2_intro/
100 | #G #L #k #d #Hkd #K #s #l #m #_ #T1 #H
101 lapply (lift_inv_sort2 … H) -H #H destruct /3 width=3 by cpx_st, lift_sort, ex2_intro/
102 | #I #G #L #LV #V #V2 #W2 #i #HLV #HV2 #HVW2 #IHV2 #K #s #l #m #HLK #T1 #H
103 elim (lift_inv_lref2 … H) -H * #Hil #H destruct
104 [ elim (drop_conf_lt … HLK … HLV) -L // #L #U #HKL #HLV #HUV
105 elim (IHV2 … HLV … HUV) -V #U2 #HUV2 #HU2
106 elim (lift_trans_le … HUV2 … HVW2) -V2 // >minus_plus <plus_minus_m_m /3 width=9 by cpx_delta, ex2_intro/
107 | elim (le_inv_plus_l … Hil) #Hlim #Hmi
108 lapply (drop_conf_ge … HLK … HLV ?) -L // #HKLV
109 elim (lift_split … HVW2 l (i - m + 1)) -HVW2 /3 width=1 by le_S, le_S_S/ -Hil -Hlim
110 #V1 #HV1 >plus_minus // <minus_minus /2 width=1 by le_S/ <minus_n_n <plus_n_O /3 width=9 by cpx_delta, ex2_intro/
112 | #a #I #G #L #V1 #V2 #U1 #U2 #_ #_ #IHV12 #IHU12 #K #s #l #m #HLK #X #H
113 elim (lift_inv_bind2 … H) -H #W1 #T1 #HWV1 #HTU1 #H destruct
114 elim (IHV12 … HLK … HWV1) -IHV12 #W2 #HW12 #HWV2
115 elim (IHU12 … HTU1) -IHU12 -HTU1 /3 width=6 by cpx_bind, drop_skip, lift_bind, ex2_intro/
116 | #I #G #L #V1 #V2 #U1 #U2 #_ #_ #IHV12 #IHU12 #K #s #l #m #HLK #X #H
117 elim (lift_inv_flat2 … H) -H #W1 #T1 #HWV1 #HTU1 #H destruct
118 elim (IHV12 … HLK … HWV1) -V1
119 elim (IHU12 … HLK … HTU1) -U1 -HLK /3 width=5 by cpx_flat, lift_flat, ex2_intro/
120 | #G #L #V #U1 #U #U2 #_ #HU2 #IHU1 #K #s #l #m #HLK #X #H
121 elim (lift_inv_bind2 … H) -H #W1 #T1 #HWV1 #HTU1 #H destruct
122 elim (IHU1 (K.ⓓW1) s … HTU1) /2 width=1 by drop_skip/ -L -U1 #T #HTU #HT1
123 elim (lift_div_le … HU2 … HTU) -U /3 width=5 by cpx_zeta, ex2_intro/
124 | #G #L #V #U1 #U2 #_ #IHU12 #K #s #l #m #HLK #X #H
125 elim (lift_inv_flat2 … H) -H #W1 #T1 #HWV1 #HTU1 #H destruct
126 elim (IHU12 … HLK … HTU1) -L -U1 /3 width=3 by cpx_eps, ex2_intro/
127 | #G #L #V1 #V2 #U1 #_ #IHV12 #K #s #l #m #HLK #X #H
128 elim (lift_inv_flat2 … H) -H #W1 #T1 #HWV1 #HTU1 #H destruct
129 elim (IHV12 … HLK … HWV1) -L -V1 /3 width=3 by cpx_ct, ex2_intro/
130 | #a #G #L #V1 #V2 #W1 #W2 #T1 #T2 #_ #_ #_ #IHV12 #IHW12 #IHT12 #K #s #l #m #HLK #X #HX
131 elim (lift_inv_flat2 … HX) -HX #V0 #Y #HV01 #HY #HX destruct
132 elim (lift_inv_bind2 … HY) -HY #W0 #T0 #HW01 #HT01 #HY destruct
133 elim (IHV12 … HLK … HV01) -V1 #V3 #HV32 #HV03
134 elim (IHT12 (K.ⓛW0) s … HT01) -T1 /2 width=1 by drop_skip/ #T3 #HT32 #HT03
135 elim (IHW12 … HLK … HW01) -W1
136 /4 width=7 by cpx_beta, lift_bind, lift_flat, ex2_intro/
137 | #a #G #L #V1 #V #V2 #W1 #W2 #T1 #T2 #_ #HV2 #_ #_ #IHV1 #IHW12 #IHT12 #K #s #l #m #HLK #X #HX
138 elim (lift_inv_flat2 … HX) -HX #V0 #Y #HV01 #HY #HX destruct
139 elim (lift_inv_bind2 … HY) -HY #W0 #T0 #HW01 #HT01 #HY destruct
140 elim (IHV1 … HLK … HV01) -V1 #V3 #HV3 #HV03
141 elim (IHT12 (K.ⓓW0) s … HT01) -T1 /2 width=1 by drop_skip/ #T3 #HT32 #HT03
142 elim (IHW12 … HLK … HW01) -W1 #W3 #HW32 #HW03
143 elim (lift_trans_le … HV3 … HV2) -V
144 /4 width=9 by cpx_theta, lift_bind, lift_flat, ex2_intro/
148 (* Properties on supclosure *************************************************)
150 lemma fqu_cpx_trans: ∀h,g,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐ ⦃G2, L2, T2⦄ →
151 ∀U2. ⦃G2, L2⦄ ⊢ T2 ➡[h, g] U2 →
152 ∃∃U1. ⦃G1, L1⦄ ⊢ T1 ➡[h, g] U1 & ⦃G1, L1, U1⦄ ⊐ ⦃G2, L2, U2⦄.
153 #h #g #G1 #G2 #L1 #L2 #T1 #T2 #H elim H -G1 -G2 -L1 -L2 -T1 -T2
154 /3 width=3 by fqu_pair_sn, fqu_bind_dx, fqu_flat_dx, cpx_pair_sn, cpx_bind, cpx_flat, ex2_intro/
155 [ #I #G #L #V2 #U2 #HVU2
156 elim (lift_total U2 0 1)
157 /4 width=7 by fqu_drop, cpx_delta, drop_pair, drop_drop, ex2_intro/
158 | #G #L #K #T1 #U1 #m #HLK1 #HTU1 #T2 #HTU2
159 elim (lift_total T2 0 (m+1))
160 /3 width=11 by cpx_lift, fqu_drop, ex2_intro/
164 lemma fqu_sta_trans: ∀h,g,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐ ⦃G2, L2, T2⦄ →
165 ∀U2. ⦃G2, L2⦄ ⊢ T2 •*[h, 1] U2 →
166 ∀d. ⦃G2, L2⦄ ⊢ T2 ▪[h, g] d+1 →
167 ∃∃U1. ⦃G1, L1⦄ ⊢ T1 ➡[h, g] U1 & ⦃G1, L1, U1⦄ ⊐ ⦃G2, L2, U2⦄.
168 /3 width=5 by fqu_cpx_trans, sta_cpx/ qed-.
170 lemma fquq_cpx_trans: ∀h,g,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐⸮ ⦃G2, L2, T2⦄ →
171 ∀U2. ⦃G2, L2⦄ ⊢ T2 ➡[h, g] U2 →
172 ∃∃U1. ⦃G1, L1⦄ ⊢ T1 ➡[h, g] U1 & ⦃G1, L1, U1⦄ ⊐⸮ ⦃G2, L2, U2⦄.
173 #h #g #G1 #G2 #L1 #L2 #T1 #T2 #H #U2 #HTU2 elim (fquq_inv_gen … H) -H
174 [ #HT12 elim (fqu_cpx_trans … HT12 … HTU2) /3 width=3 by fqu_fquq, ex2_intro/
175 | * #H1 #H2 #H3 destruct /2 width=3 by ex2_intro/
179 lemma fquq_sta_trans: ∀h,g,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐⸮ ⦃G2, L2, T2⦄ →
180 ∀U2. ⦃G2, L2⦄ ⊢ T2 •*[h, 1] U2 →
181 ∀d. ⦃G2, L2⦄ ⊢ T2 ▪[h, g] d+1 →
182 ∃∃U1. ⦃G1, L1⦄ ⊢ T1 ➡[h, g] U1 & ⦃G1, L1, U1⦄ ⊐⸮ ⦃G2, L2, U2⦄.
183 /3 width=5 by fquq_cpx_trans, sta_cpx/ qed-.
185 lemma fqup_cpx_trans: ∀h,g,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐+ ⦃G2, L2, T2⦄ →
186 ∀U2. ⦃G2, L2⦄ ⊢ T2 ➡[h, g] U2 →
187 ∃∃U1. ⦃G1, L1⦄ ⊢ T1 ➡[h, g] U1 & ⦃G1, L1, U1⦄ ⊐+ ⦃G2, L2, U2⦄.
188 #h #g #G1 #G2 #L1 #L2 #T1 #T2 #H @(fqup_ind … H) -G2 -L2 -T2
189 [ #G2 #L2 #T2 #H12 #U2 #HTU2 elim (fqu_cpx_trans … H12 … HTU2) -T2
190 /3 width=3 by fqu_fqup, ex2_intro/
191 | #G #G2 #L #L2 #T #T2 #_ #HT2 #IHT1 #U2 #HTU2
192 elim (fqu_cpx_trans … HT2 … HTU2) -T2 #T2 #HT2 #HTU2
193 elim (IHT1 … HT2) -T /3 width=7 by fqup_strap1, ex2_intro/
197 lemma fqus_cpx_trans: ∀h,g,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐* ⦃G2, L2, T2⦄ →
198 ∀U2. ⦃G2, L2⦄ ⊢ T2 ➡[h, g] U2 →
199 ∃∃U1. ⦃G1, L1⦄ ⊢ T1 ➡[h, g] U1 & ⦃G1, L1, U1⦄ ⊐* ⦃G2, L2, U2⦄.
200 #h #g #G1 #G2 #L1 #L2 #T1 #T2 #H #U2 #HTU2 elim (fqus_inv_gen … H) -H
201 [ #HT12 elim (fqup_cpx_trans … HT12 … HTU2) /3 width=3 by fqup_fqus, ex2_intro/
202 | * #H1 #H2 #H3 destruct /2 width=3 by ex2_intro/
206 lemma fqu_cpx_trans_neq: ∀h,g,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐ ⦃G2, L2, T2⦄ →
207 ∀U2. ⦃G2, L2⦄ ⊢ T2 ➡[h, g] U2 → (T2 = U2 → ⊥) →
208 ∃∃U1. ⦃G1, L1⦄ ⊢ T1 ➡[h, g] U1 & T1 = U1 → ⊥ & ⦃G1, L1, U1⦄ ⊐ ⦃G2, L2, U2⦄.
209 #h #g #G1 #G2 #L1 #L2 #T1 #T2 #H elim H -G1 -G2 -L1 -L2 -T1 -T2
210 [ #I #G #L #V1 #V2 #HV12 #_ elim (lift_total V2 0 1)
211 #U2 #HVU2 @(ex3_intro … U2)
212 [1,3: /3 width=7 by fqu_drop, cpx_delta, drop_pair, drop_drop/
213 | #H destruct /2 width=7 by lift_inv_lref2_be/
215 | #I #G #L #V1 #T #V2 #HV12 #H @(ex3_intro … (②{I}V2.T))
216 [1,3: /2 width=4 by fqu_pair_sn, cpx_pair_sn/
217 | #H0 destruct /2 width=1 by/
219 | #a #I #G #L #V #T1 #T2 #HT12 #H @(ex3_intro … (ⓑ{a,I}V.T2))
220 [1,3: /2 width=4 by fqu_bind_dx, cpx_bind/
221 | #H0 destruct /2 width=1 by/
223 | #I #G #L #V #T1 #T2 #HT12 #H @(ex3_intro … (ⓕ{I}V.T2))
224 [1,3: /2 width=4 by fqu_flat_dx, cpx_flat/
225 | #H0 destruct /2 width=1 by/
227 | #G #L #K #T1 #U1 #m #HLK #HTU1 #T2 #HT12 #H elim (lift_total T2 0 (m+1))
228 #U2 #HTU2 @(ex3_intro … U2)
229 [1,3: /2 width=10 by cpx_lift, fqu_drop/
230 | #H0 destruct /3 width=5 by lift_inj/
234 lemma fquq_cpx_trans_neq: ∀h,g,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐⸮ ⦃G2, L2, T2⦄ →
235 ∀U2. ⦃G2, L2⦄ ⊢ T2 ➡[h, g] U2 → (T2 = U2 → ⊥) →
236 ∃∃U1. ⦃G1, L1⦄ ⊢ T1 ➡[h, g] U1 & T1 = U1 → ⊥ & ⦃G1, L1, U1⦄ ⊐⸮ ⦃G2, L2, U2⦄.
237 #h #g #G1 #G2 #L1 #L2 #T1 #T2 #H12 #U2 #HTU2 #H elim (fquq_inv_gen … H12) -H12
238 [ #H12 elim (fqu_cpx_trans_neq … H12 … HTU2 H) -T2
239 /3 width=4 by fqu_fquq, ex3_intro/
240 | * #HG #HL #HT destruct /3 width=4 by ex3_intro/
244 lemma fqup_cpx_trans_neq: ∀h,g,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐+ ⦃G2, L2, T2⦄ →
245 ∀U2. ⦃G2, L2⦄ ⊢ T2 ➡[h, g] U2 → (T2 = U2 → ⊥) →
246 ∃∃U1. ⦃G1, L1⦄ ⊢ T1 ➡[h, g] U1 & T1 = U1 → ⊥ & ⦃G1, L1, U1⦄ ⊐+ ⦃G2, L2, U2⦄.
247 #h #g #G1 #G2 #L1 #L2 #T1 #T2 #H @(fqup_ind_dx … H) -G1 -L1 -T1
248 [ #G1 #L1 #T1 #H12 #U2 #HTU2 #H elim (fqu_cpx_trans_neq … H12 … HTU2 H) -T2
249 /3 width=4 by fqu_fqup, ex3_intro/
250 | #G #G1 #L #L1 #T #T1 #H1 #_ #IH12 #U2 #HTU2 #H elim (IH12 … HTU2 H) -T2
251 #U1 #HTU1 #H #H12 elim (fqu_cpx_trans_neq … H1 … HTU1 H) -T1
252 /3 width=8 by fqup_strap2, ex3_intro/
256 lemma fqus_cpx_trans_neq: ∀h,g,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐* ⦃G2, L2, T2⦄ →
257 ∀U2. ⦃G2, L2⦄ ⊢ T2 ➡[h, g] U2 → (T2 = U2 → ⊥) →
258 ∃∃U1. ⦃G1, L1⦄ ⊢ T1 ➡[h, g] U1 & T1 = U1 → ⊥ & ⦃G1, L1, U1⦄ ⊐* ⦃G2, L2, U2⦄.
259 #h #g #G1 #G2 #L1 #L2 #T1 #T2 #H12 #U2 #HTU2 #H elim (fqus_inv_gen … H12) -H12
260 [ #H12 elim (fqup_cpx_trans_neq … H12 … HTU2 H) -T2
261 /3 width=4 by fqup_fqus, ex3_intro/
262 | * #HG #HL #HT destruct /3 width=4 by ex3_intro/