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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_2/relocation/lifts_tdeq.ma".
16 include "basic_2/static/lfxs_lfxs.ma".
17 include "basic_2/static/lfdeq_fqup.ma".
18 include "basic_2/rt_transition/lfpx_frees.ma".
19 include "basic_2/rt_transition/lfpx.ma". (**) (* should be in lfpx_frees.ma *)
21 (* UNCOUNTED PARALLEL RT-TRANSITION FOR LOCAL ENV.S ON REFERRED ENTRIES *****)
23 (* Properties with degree-based equivalence for local environments **********)
25 lemma cpx_tdeq_conf_lexs: ∀h,o,G. R_confluent2_lfxs … (cpx h G) (cdeq h o) (cpx h G) (cdeq h o).
26 #h #o #G #L0 #T0 #T1 #H @(cpx_ind … H) -G -L0 -T0 -T1 /2 width=3 by ex2_intro/
27 [ #G #L0 #s0 #X0 #H0 #L1 #HL01 #L2 #HL02
28 elim (tdeq_inv_sort1 … H0) -H0 #s1 #d1 #Hs0 #Hs1 #H destruct
29 /4 width=3 by tdeq_sort, deg_next, ex2_intro/
30 | #I #G #K0 #V0 #V1 #W1 #_ #IH #HVW1 #T2 #H0 #L1 #H1 #L2 #H2
31 >(tdeq_inv_lref1 … H0) -H0
32 elim (lfpx_inv_zero_pair_sn … H1) -H1 #K1 #X1 #HK01 #HX1 #H destruct
33 elim (lfdeq_inv_zero_pair_sn … H2) -H2 #K2 #X2 #HK02 #HX2 #H destruct
34 elim (IH X2 … HK01 … HK02) // -K0 -V0 #V #HV1 #HV2
35 elim (tdeq_lifts_sn … HV1 … HVW1) -V1 /3 width=5 by cpx_delta, ex2_intro/
36 | #I #G #K0 #V0 #V1 #W1 #i #_ #IH #HVW1 #T2 #H0 #L1 #H1 #L2 #H2
37 >(tdeq_inv_lref1 … H0) -H0
38 elim (lfpx_inv_lref_pair_sn … H1) -H1 #K1 #X1 #HK01 #H destruct
39 elim (lfdeq_inv_lref_pair_sn … H2) -H2 #K2 #X2 #HK02 #H destruct
40 elim (IH … HK01 … HK02) [|*: //] -K0 -V0 #V #HV1 #HV2
41 elim (tdeq_lifts_sn … HV1 … HVW1) -V1 /3 width=5 by cpx_lref, ex2_intro/
42 | #p #I #G #L0 #V0 #V1 #T0 #T1 #_ #_ #IHV #IHT #X0 #H0 #L1 #H1 #L2 #H2
43 elim (tdeq_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #HT02 #H destruct
44 elim (lfpx_inv_bind … H1) -H1 #HL01 #H1
45 elim (lfdeq_inv_bind … H2) -H2 #HL02 #H2
46 lapply (lfdeq_pair_repl_dx … H2 … HV02) -H2 #H2
47 elim (IHV … HV02 … HL01 … HL02) -IHV -HV02 -HL01 -HL02
48 elim (IHT … HT02 … H1 … H2) -L0 -T0
49 /3 width=5 by cpx_bind, tdeq_pair, ex2_intro/
50 | #I #G #L0 #V0 #V1 #T0 #T1 #_ #_ #IHV #IHT #X0 #H0 #L1 #H1 #L2 #H2
51 elim (tdeq_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #HT02 #H destruct
52 elim (lfpx_inv_flat … H1) -H1 #HL01 #H1
53 elim (lfdeq_inv_flat … H2) -H2 #HL02 #H2
54 elim (IHV … HV02 … HL01 … HL02) -IHV -HV02 -HL01 -HL02
55 elim (IHT … HT02 … H1 … H2) -L0 -V0 -T0
56 /3 width=5 by cpx_flat, tdeq_pair, ex2_intro/
57 | #G #L0 #V0 #T0 #T1 #U1 #_ #IH #HUT1 #X0 #H0 #L1 #H1 #L2 #H2
58 elim (tdeq_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #HT02 #H destruct
59 elim (lfpx_inv_bind … H1) -H1 #HL01 #H1
60 elim (lfdeq_inv_bind … H2) -H2 #HL02 #H2
61 lapply (lfdeq_pair_repl_dx … H2 … HV02) -H2 -HV02 #H2
62 elim (IH … HT02 … H1 … H2) -L0 -T0 #T #HT1
63 elim (tdeq_inv_lifts_sn … HT1 … HUT1) -T1
64 /3 width=5 by cpx_zeta, ex2_intro/
65 | #G #L0 #V0 #T0 #T1 #_ #IH #X0 #H0 #L1 #H1 #L2 #H2
66 elim (tdeq_inv_pair1 … H0) -H0 #V2 #T2 #_ #HT02 #H destruct
67 elim (lfpx_inv_flat … H1) -H1 #HL01 #H1
68 elim (lfdeq_inv_flat … H2) -H2 #HL02 #H2
69 elim (IH … HT02 … H1 … H2) -L0 -V0 -T0
70 /3 width=3 by cpx_eps, ex2_intro/
71 | #G #L0 #V0 #T0 #T1 #_ #IH #X0 #H0 #L1 #H1 #L2 #H2
72 elim (tdeq_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #_ #H destruct
73 elim (lfpx_inv_flat … H1) -H1 #HL01 #H1
74 elim (lfdeq_inv_flat … H2) -H2 #HL02 #H2
75 elim (IH … HV02 … HL01 … HL02) -L0 -V0 -T1
76 /3 width=3 by cpx_ee, ex2_intro/
77 | #p #G #L0 #V0 #V1 #W0 #W1 #T0 #T1 #_ #_ #_ #IHV #IHW #IHT #X0 #H0 #L1 #H1 #L2 #H2
78 elim (tdeq_inv_pair1 … H0) -H0 #V2 #X #HV02 #H0 #H destruct
79 elim (tdeq_inv_pair1 … H0) -H0 #W2 #T2 #HW02 #HT02 #H destruct
80 elim (lfpx_inv_flat … H1) -H1 #H1LV0 #H1
81 elim (lfpx_inv_bind … H1) -H1 #H1LW0 #H1LT0
82 elim (lfdeq_inv_flat … H2) -H2 #H2LV0 #H2
83 elim (lfdeq_inv_bind … H2) -H2 #H2LW0 #H2LT0
84 lapply (lfdeq_pair_repl_dx … H2LT0 … HW02) -H2LT0 #H2LT0
85 elim (IHV … HV02 … H1LV0 … H2LV0) -IHV -HV02 -H1LV0 -H2LV0
86 elim (IHW … HW02 … H1LW0 … H2LW0) -IHW -HW02 -H1LW0 -H2LW0
87 elim (IHT … HT02 … H1LT0 … H2LT0) -L0 -V0 -T0
88 /4 width=7 by cpx_beta, tdeq_pair, ex2_intro/ (* note: 2 tdeq_pair *)
89 | #p #G #L0 #V0 #V1 #U1 #W0 #W1 #T0 #T1 #_ #_ #_ #IHV #IHW #IHT #HVU1 #X0 #H0 #L1 #H1 #L2 #H2
90 elim (tdeq_inv_pair1 … H0) -H0 #V2 #X #HV02 #H0 #H destruct
91 elim (tdeq_inv_pair1 … H0) -H0 #W2 #T2 #HW02 #HT02 #H destruct
92 elim (lfpx_inv_flat … H1) -H1 #H1LV0 #H1
93 elim (lfpx_inv_bind … H1) -H1 #H1LW0 #H1LT0
94 elim (lfdeq_inv_flat … H2) -H2 #H2LV0 #H2
95 elim (lfdeq_inv_bind … H2) -H2 #H2LW0 #H2LT0
96 lapply (lfdeq_pair_repl_dx … H2LT0 … HW02) -H2LT0 #H2LT0
97 elim (IHV … HV02 … H1LV0 … H2LV0) -IHV -HV02 -H1LV0 -H2LV0 #V #HV1
98 elim (IHW … HW02 … H1LW0 … H2LW0) -IHW -HW02 -H1LW0 -H2LW0
99 elim (IHT … HT02 … H1LT0 … H2LT0) -L0 -V0 -T0
100 elim (tdeq_lifts_sn … HV1 … HVU1) -V1
101 /4 width=9 by cpx_theta, tdeq_pair, ex2_intro/ (* note: 2 tdeq_pair *)
105 lemma cpx_tdeq_conf: ∀h,o,G,L,T0,T1. ⦃G, L⦄ ⊢ T0 ⬈[h] T1 →
107 ∃∃T. T1 ≡[h, o] T & ⦃G, L⦄ ⊢ T2 ⬈[h] T.
108 #h #o #G #L #T0 #T1 #HT01 #T2 #HT02
109 elim (cpx_tdeq_conf_lexs … HT01 … HT02 L … L) -HT01 -HT02
110 /2 width=3 by lfxs_refl, ex2_intro/
113 lemma tdeq_cpx_trans: ∀h,o,G,L,T2,T0. T2 ≡[h, o] T0 →
114 ∀T1. ⦃G, L⦄ ⊢ T0 ⬈[h] T1 →
115 ∃∃T. ⦃G, L⦄ ⊢ T2 ⬈[h] T & T ≡[h, o] T1.
116 #h #o #G #L #T2 #T0 #HT20 #T1 #HT01
117 elim (cpx_tdeq_conf … HT01 T2) -HT01 /3 width=3 by tdeq_sym, ex2_intro/
120 (* Basic_2A1: was just: cpx_lleq_conf *)
121 lemma cpx_lfdeq_conf: ∀h,o,G,L0,T0,T1. ⦃G, L0⦄ ⊢ T0 ⬈[h] T1 →
122 ∀L2. L0 ≡[h, o, T0] L2 →
123 ∃∃T. ⦃G, L2⦄ ⊢ T0 ⬈[h] T & T1 ≡[h, o] T.
124 #h #o #G #L0 #T0 #T1 #HT01 #L2 #HL02
125 elim (cpx_tdeq_conf_lexs … HT01 T0 … L0 … HL02) -HT01 -HL02
126 /2 width=3 by lfxs_refl, ex2_intro/
129 (* Basic_2A1: was just: lleq_cpx_trans *)
130 lemma lfdeq_cpx_trans: ∀h,o,G,L2,L0,T0. L2 ≡[h, o, T0] L0 →
131 ∀T1. ⦃G, L0⦄ ⊢ T0 ⬈[h] T1 →
132 ∃∃T. ⦃G, L2⦄ ⊢ T0 ⬈[h] T & T ≡[h, o] T1.
133 #h #o #G #L2 #L0 #T0 #HL20 #T1 #HT01
134 elim (cpx_lfdeq_conf … o … HT01 L2) -HT01
135 /3 width=3 by lfdeq_sym, tdeq_sym, ex2_intro/
138 lemma lfpx_lfdeq_conf: ∀h,o,G,T. confluent2 … (lfpx h G T) (lfdeq h o T).
139 /3 width=6 by lfpx_frees_conf, cpx_tdeq_conf_lexs, frees_lfdeq_conf_lexs, lfxs_conf/ qed-.
141 (* Basic_2A1: was just: lleq_lpx_trans *)
142 lemma lfdeq_lfpx_trans: ∀h,o,G,T,L2,K2. ⦃G, L2⦄ ⊢ ⬈[h, T] K2 →
143 ∀L1. L1 ≡[h, o, T] L2 →
144 ∃∃K1. ⦃G, L1⦄ ⊢ ⬈[h, T] K1 & K1 ≡[h, o, T] K2.
145 #h #o #G #T #L2 #K2 #HLK2 #L1 #HL12
146 elim (lfpx_lfdeq_conf … o … HLK2 L1)
147 /3 width=3 by lfdeq_sym, ex2_intro/
150 (* Properties with supclosure ***********************************************)
152 lemma lpx_lleq_fqu_trans: ∀h,o,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐ ⦃G2, L2, T2⦄ →
153 ∀K1. ⦃G1, K1⦄ ⊢ ➡[h, o] L1 → K1 ≡[T1, 0] L1 →
154 ∃∃K2. ⦃G1, K1, T1⦄ ⊐ ⦃G2, K2, T2⦄ & ⦃G2, K2⦄ ⊢ ➡[h, o] L2 & K2 ≡[T2, 0] L2.
155 #h #o #G1 #G2 #L1 #L2 #T1 #T2 #H elim H -G1 -G2 -L1 -L2 -T1 -T2
156 [ #I #G1 #L1 #V1 #X #H1 #H2 elim (lpx_inv_pair2 … H1) -H1
157 #K0 #V0 #H1KL1 #_ #H destruct
158 elim (lleq_inv_lref_ge_dx … H2 ? I L1 V1) -H2 //
159 #K1 #H #H2KL1 lapply (drop_inv_O2 … H) -H #H destruct
160 /2 width=4 by fqu_lref_O, ex3_intro/
161 | * [ #a ] #I #G1 #L1 #V1 #T1 #K1 #HLK1 #H
162 [ elim (lleq_inv_bind … H)
163 | elim (lleq_inv_flat … H)
164 ] -H /2 width=4 by fqu_pair_sn, ex3_intro/
165 | #a #I #G1 #L1 #V1 #T1 #K1 #HLK1 #H elim (lleq_inv_bind_O … H) -H
166 /3 width=4 by lpx_pair, fqu_bind_dx, ex3_intro/
167 | #I #G1 #L1 #V1 #T1 #K1 #HLK1 #H elim (lleq_inv_flat … H) -H
168 /2 width=4 by fqu_flat_dx, ex3_intro/
169 | #G1 #L1 #L #T1 #U1 #k #HL1 #HTU1 #K1 #H1KL1 #H2KL1
170 elim (drop_O1_le (Ⓕ) (k+1) K1)
171 [ #K #HK1 lapply (lleq_inv_lift_le … H2KL1 … HK1 HL1 … HTU1 ?) -H2KL1 //
172 #H2KL elim (lpx_drop_trans_O1 … H1KL1 … HL1) -L1
173 #K0 #HK10 #H1KL lapply (drop_mono … HK10 … HK1) -HK10 #H destruct
174 /3 width=4 by fqu_drop, ex3_intro/
175 | lapply (drop_fwd_length_le2 … HL1) -L -T1 -o
176 lapply (lleq_fwd_length … H2KL1) //
181 lemma lpx_lleq_fquq_trans: ∀h,o,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐⸮ ⦃G2, L2, T2⦄ →
182 ∀K1. ⦃G1, K1⦄ ⊢ ➡[h, o] L1 → K1 ≡[T1, 0] L1 →
183 ∃∃K2. ⦃G1, K1, T1⦄ ⊐⸮ ⦃G2, K2, T2⦄ & ⦃G2, K2⦄ ⊢ ➡[h, o] L2 & K2 ≡[T2, 0] L2.
184 #h #o #G1 #G2 #L1 #L2 #T1 #T2 #H #K1 #H1KL1 #H2KL1
185 elim (fquq_inv_gen … H) -H
186 [ #H elim (lpx_lleq_fqu_trans … H … H1KL1 H2KL1) -L1
187 /3 width=4 by fqu_fquq, ex3_intro/
188 | * #HG #HL #HT destruct /2 width=4 by ex3_intro/
192 lemma lpx_lleq_fqup_trans: ∀h,o,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐+ ⦃G2, L2, T2⦄ →
193 ∀K1. ⦃G1, K1⦄ ⊢ ➡[h, o] L1 → K1 ≡[T1, 0] L1 →
194 ∃∃K2. ⦃G1, K1, T1⦄ ⊐+ ⦃G2, K2, T2⦄ & ⦃G2, K2⦄ ⊢ ➡[h, o] L2 & K2 ≡[T2, 0] L2.
195 #h #o #G1 #G2 #L1 #L2 #T1 #T2 #H @(fqup_ind … H) -G2 -L2 -T2
196 [ #G2 #L2 #T2 #H #K1 #H1KL1 #H2KL1 elim (lpx_lleq_fqu_trans … H … H1KL1 H2KL1) -L1
197 /3 width=4 by fqu_fqup, ex3_intro/
198 | #G #G2 #L #L2 #T #T2 #_ #HT2 #IHT1 #K1 #H1KL1 #H2KL1 elim (IHT1 … H2KL1) // -L1
199 #K #HT1 #H1KL #H2KL elim (lpx_lleq_fqu_trans … HT2 … H1KL H2KL) -L
200 /3 width=5 by fqup_strap1, ex3_intro/
204 lemma lpx_lleq_fqus_trans: ∀h,o,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐* ⦃G2, L2, T2⦄ →
205 ∀K1. ⦃G1, K1⦄ ⊢ ➡[h, o] L1 → K1 ≡[T1, 0] L1 →
206 ∃∃K2. ⦃G1, K1, T1⦄ ⊐* ⦃G2, K2, T2⦄ & ⦃G2, K2⦄ ⊢ ➡[h, o] L2 & K2 ≡[T2, 0] L2.
207 #h #o #G1 #G2 #L1 #L2 #T1 #T2 #H #K1 #H1KL1 #H2KL1
208 elim (fqus_inv_gen … H) -H
209 [ #H elim (lpx_lleq_fqup_trans … H … H1KL1 H2KL1) -L1
210 /3 width=4 by fqup_fqus, ex3_intro/
211 | * #HG #HL #HT destruct /2 width=4 by ex3_intro/