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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/relocation/lifts_tdeq.ma".
16 include "basic_2/static/lfxs_lfxs.ma".
17 include "basic_2/static/lfdeq_fqup.ma".
18 include "basic_2/static/lfdeq_lfdeq.ma".
19 include "basic_2/rt_transition/cpx_lfxs.ma".
20 include "basic_2/rt_transition/lfpx.ma".
22 (* UNCOUNTED PARALLEL RT-TRANSITION FOR LOCAL ENV.S ON REFERRED ENTRIES *****)
24 (* Properties with degree-based equivalence for local environments **********)
26 lemma lfpx_pair_sn_split: ∀h,G,L1,L2,V. ⦃G, L1⦄ ⊢ ⬈[h, V] L2 → ∀o,I,T.
27 ∃∃L. ⦃G, L1⦄ ⊢ ⬈[h, ②{I}V.T] L & L ≛[h, o, V] L2.
28 /3 width=5 by lfpx_fle_comp, lfxs_pair_sn_split/ qed-.
30 lemma lfpx_flat_dx_split: ∀h,G,L1,L2,T. ⦃G, L1⦄ ⊢ ⬈[h, T] L2 → ∀o,I,V.
31 ∃∃L. ⦃G, L1⦄ ⊢ ⬈[h, ⓕ{I}V.T] L & L ≛[h, o, T] L2.
32 /3 width=5 by lfpx_fle_comp, lfxs_flat_dx_split/ qed-.
34 lemma lfpx_bind_dx_split: ∀h,I,G,L1,L2,V1,T. ⦃G, L1.ⓑ{I}V1⦄ ⊢ ⬈[h, T] L2 → ∀o,p.
35 ∃∃L,V. ⦃G, L1⦄ ⊢ ⬈[h, ⓑ{p,I}V1.T] L & L.ⓑ{I}V ≛[h, o, T] L2 & ⦃G, L1⦄ ⊢ V1 ⬈[h] V.
36 /3 width=5 by lfpx_fle_comp, lfxs_bind_dx_split/ qed-.
38 lemma lfpx_bind_dx_split_void: ∀h,G,K1,L2,T. ⦃G, K1.ⓧ⦄ ⊢ ⬈[h, T] L2 → ∀o,p,I,V.
39 ∃∃K2. ⦃G, K1⦄ ⊢ ⬈[h, ⓑ{p,I}V.T] K2 & K2.ⓧ ≛[h, o, T] L2.
40 /3 width=5 by lfpx_fle_comp, lfxs_bind_dx_split_void/ qed-.
42 lemma cpx_tdeq_conf_lexs: ∀h,o,G. R_confluent2_lfxs … (cpx h G) (cdeq h o) (cpx h G) (cdeq h o).
43 #h #o #G #L0 #T0 #T1 #H @(cpx_ind … H) -G -L0 -T0 -T1 /2 width=3 by ex2_intro/
44 [ #G #L0 #s0 #X0 #H0 #L1 #HL01 #L2 #HL02
45 elim (tdeq_inv_sort1 … H0) -H0 #s1 #d1 #Hs0 #Hs1 #H destruct
46 /4 width=3 by tdeq_sort, deg_next, ex2_intro/
47 | #I #G #K0 #V0 #V1 #W1 #_ #IH #HVW1 #T2 #H0 #L1 #H1 #L2 #H2
48 >(tdeq_inv_lref1 … H0) -H0
49 elim (lfpx_inv_zero_pair_sn … H1) -H1 #K1 #X1 #HK01 #HX1 #H destruct
50 elim (lfdeq_inv_zero_pair_sn … H2) -H2 #K2 #X2 #HK02 #HX2 #H destruct
51 elim (IH X2 … HK01 … HK02) // -K0 -V0 #V #HV1 #HV2
52 elim (tdeq_lifts_sn … HV1 … HVW1) -V1 /3 width=5 by cpx_delta, ex2_intro/
53 | #I0 #G #K0 #V1 #W1 #i #_ #IH #HVW1 #T2 #H0 #L1 #H1 #L2 #H2
54 >(tdeq_inv_lref1 … H0) -H0
55 elim (lfpx_inv_lref_bind_sn … H1) -H1 #I1 #K1 #HK01 #H destruct
56 elim (lfdeq_inv_lref_bind_sn … H2) -H2 #I2 #K2 #HK02 #H destruct
57 elim (IH … HK01 … HK02) [|*: //] -K0 #V #HV1 #HV2
58 elim (tdeq_lifts_sn … HV1 … HVW1) -V1 /3 width=5 by cpx_lref, ex2_intro/
59 | #p #I #G #L0 #V0 #V1 #T0 #T1 #_ #_ #IHV #IHT #X0 #H0 #L1 #H1 #L2 #H2
60 elim (tdeq_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #HT02 #H destruct
61 elim (lfpx_inv_bind … H1) -H1 #HL01 #H1
62 elim (lfdeq_inv_bind … H2) -H2 #HL02 #H2
63 lapply (lfdeq_bind_repl_dx … H2 (BPair I V2) ?) -H2 /2 width=1 by ext2_pair/ #H2
64 elim (IHV … HV02 … HL01 … HL02) -IHV -HV02 -HL01 -HL02
65 elim (IHT … HT02 … H1 … H2) -L0 -T0
66 /3 width=5 by cpx_bind, tdeq_pair, ex2_intro/
67 | #I #G #L0 #V0 #V1 #T0 #T1 #_ #_ #IHV #IHT #X0 #H0 #L1 #H1 #L2 #H2
68 elim (tdeq_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #HT02 #H destruct
69 elim (lfpx_inv_flat … H1) -H1 #HL01 #H1
70 elim (lfdeq_inv_flat … H2) -H2 #HL02 #H2
71 elim (IHV … HV02 … HL01 … HL02) -IHV -HV02 -HL01 -HL02
72 elim (IHT … HT02 … H1 … H2) -L0 -V0 -T0
73 /3 width=5 by cpx_flat, tdeq_pair, ex2_intro/
74 | #G #L0 #V0 #T0 #T1 #U1 #_ #IH #HUT1 #X0 #H0 #L1 #H1 #L2 #H2
75 elim (tdeq_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #HT02 #H destruct
76 elim (lfpx_inv_bind … H1) -H1 #HL01 #H1
77 elim (lfdeq_inv_bind … H2) -H2 #HL02 #H2
78 lapply (lfdeq_bind_repl_dx … H2 (BPair Abbr V2) ?) -H2 /2 width=1 by ext2_pair/ -HV02 #H2
79 elim (IH … HT02 … H1 … H2) -L0 -T0 #T #HT1
80 elim (tdeq_inv_lifts_sn … HT1 … HUT1) -T1
81 /3 width=5 by cpx_zeta, ex2_intro/
82 | #G #L0 #V0 #T0 #T1 #_ #IH #X0 #H0 #L1 #H1 #L2 #H2
83 elim (tdeq_inv_pair1 … H0) -H0 #V2 #T2 #_ #HT02 #H destruct
84 elim (lfpx_inv_flat … H1) -H1 #HL01 #H1
85 elim (lfdeq_inv_flat … H2) -H2 #HL02 #H2
86 elim (IH … HT02 … H1 … H2) -L0 -V0 -T0
87 /3 width=3 by cpx_eps, ex2_intro/
88 | #G #L0 #V0 #T0 #T1 #_ #IH #X0 #H0 #L1 #H1 #L2 #H2
89 elim (tdeq_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #_ #H destruct
90 elim (lfpx_inv_flat … H1) -H1 #HL01 #H1
91 elim (lfdeq_inv_flat … H2) -H2 #HL02 #H2
92 elim (IH … HV02 … HL01 … HL02) -L0 -V0 -T1
93 /3 width=3 by cpx_ee, ex2_intro/
94 | #p #G #L0 #V0 #V1 #W0 #W1 #T0 #T1 #_ #_ #_ #IHV #IHW #IHT #X0 #H0 #L1 #H1 #L2 #H2
95 elim (tdeq_inv_pair1 … H0) -H0 #V2 #X #HV02 #H0 #H destruct
96 elim (tdeq_inv_pair1 … H0) -H0 #W2 #T2 #HW02 #HT02 #H destruct
97 elim (lfpx_inv_flat … H1) -H1 #H1LV0 #H1
98 elim (lfpx_inv_bind … H1) -H1 #H1LW0 #H1LT0
99 elim (lfdeq_inv_flat … H2) -H2 #H2LV0 #H2
100 elim (lfdeq_inv_bind … H2) -H2 #H2LW0 #H2LT0
101 lapply (lfdeq_bind_repl_dx … H2LT0 (BPair Abst W2) ?) -H2LT0 /2 width=1 by ext2_pair/ #H2LT0
102 elim (IHV … HV02 … H1LV0 … H2LV0) -IHV -HV02 -H1LV0 -H2LV0
103 elim (IHW … HW02 … H1LW0 … H2LW0) -IHW -HW02 -H1LW0 -H2LW0
104 elim (IHT … HT02 … H1LT0 … H2LT0) -L0 -V0 -T0
105 /4 width=7 by cpx_beta, tdeq_pair, ex2_intro/ (* note: 2 tdeq_pair *)
106 | #p #G #L0 #V0 #V1 #U1 #W0 #W1 #T0 #T1 #_ #_ #_ #IHV #IHW #IHT #HVU1 #X0 #H0 #L1 #H1 #L2 #H2
107 elim (tdeq_inv_pair1 … H0) -H0 #V2 #X #HV02 #H0 #H destruct
108 elim (tdeq_inv_pair1 … H0) -H0 #W2 #T2 #HW02 #HT02 #H destruct
109 elim (lfpx_inv_flat … H1) -H1 #H1LV0 #H1
110 elim (lfpx_inv_bind … H1) -H1 #H1LW0 #H1LT0
111 elim (lfdeq_inv_flat … H2) -H2 #H2LV0 #H2
112 elim (lfdeq_inv_bind … H2) -H2 #H2LW0 #H2LT0
113 lapply (lfdeq_bind_repl_dx … H2LT0 (BPair Abbr W2) ?) -H2LT0 /2 width=1 by ext2_pair/ #H2LT0
114 elim (IHV … HV02 … H1LV0 … H2LV0) -IHV -HV02 -H1LV0 -H2LV0 #V #HV1
115 elim (IHW … HW02 … H1LW0 … H2LW0) -IHW -HW02 -H1LW0 -H2LW0
116 elim (IHT … HT02 … H1LT0 … H2LT0) -L0 -V0 -T0
117 elim (tdeq_lifts_sn … HV1 … HVU1) -V1
118 /4 width=9 by cpx_theta, tdeq_pair, ex2_intro/ (* note: 2 tdeq_pair *)
122 lemma cpx_tdeq_conf: ∀h,o,G,L. ∀T0:term. ∀T1. ⦃G, L⦄ ⊢ T0 ⬈[h] T1 →
124 ∃∃T. T1 ≛[h, o] T & ⦃G, L⦄ ⊢ T2 ⬈[h] T.
125 #h #o #G #L #T0 #T1 #HT01 #T2 #HT02
126 elim (cpx_tdeq_conf_lexs … HT01 … HT02 L … L) -HT01 -HT02
127 /2 width=3 by lfxs_refl, ex2_intro/
130 lemma tdeq_cpx_trans: ∀h,o,G,L,T2. ∀T0:term. T2 ≛[h, o] T0 →
131 ∀T1. ⦃G, L⦄ ⊢ T0 ⬈[h] T1 →
132 ∃∃T. ⦃G, L⦄ ⊢ T2 ⬈[h] T & T ≛[h, o] T1.
133 #h #o #G #L #T2 #T0 #HT20 #T1 #HT01
134 elim (cpx_tdeq_conf … HT01 T2) -HT01 /3 width=3 by tdeq_sym, ex2_intro/
137 (* Basic_2A1: uses: cpx_lleq_conf *)
138 lemma cpx_lfdeq_conf: ∀h,o,G,L0,T0,T1. ⦃G, L0⦄ ⊢ T0 ⬈[h] T1 →
139 ∀L2. L0 ≛[h, o, T0] L2 →
140 ∃∃T. ⦃G, L2⦄ ⊢ T0 ⬈[h] T & T1 ≛[h, o] T.
141 #h #o #G #L0 #T0 #T1 #HT01 #L2 #HL02
142 elim (cpx_tdeq_conf_lexs … HT01 T0 … L0 … HL02) -HT01 -HL02
143 /2 width=3 by lfxs_refl, ex2_intro/
146 (* Basic_2A1: uses: lleq_cpx_trans *)
147 lemma lfdeq_cpx_trans: ∀h,o,G,L2,L0,T0. L2 ≛[h, o, T0] L0 →
148 ∀T1. ⦃G, L0⦄ ⊢ T0 ⬈[h] T1 →
149 ∃∃T. ⦃G, L2⦄ ⊢ T0 ⬈[h] T & T ≛[h, o] T1.
150 #h #o #G #L2 #L0 #T0 #HL20 #T1 #HT01
151 elim (cpx_lfdeq_conf … o … HT01 L2) -HT01
152 /3 width=3 by lfdeq_sym, tdeq_sym, ex2_intro/
155 lemma lfpx_lfdeq_conf: ∀h,o,G,T. confluent2 … (lfpx h G T) (lfdeq h o T).
156 /3 width=6 by lfpx_fle_comp, lfdeq_fle_comp, cpx_tdeq_conf_lexs, lfxs_conf/ qed-.
158 (* Basic_2A1: uses: lleq_lpx_trans *)
159 lemma lfdeq_lfpx_trans: ∀h,o,G,T,L2,K2. ⦃G, L2⦄ ⊢ ⬈[h, T] K2 →
160 ∀L1. L1 ≛[h, o, T] L2 →
161 ∃∃K1. ⦃G, L1⦄ ⊢ ⬈[h, T] K1 & K1 ≛[h, o, T] K2.
162 #h #o #G #T #L2 #K2 #HLK2 #L1 #HL12
163 elim (lfpx_lfdeq_conf … o … HLK2 L1)
164 /3 width=3 by lfdeq_sym, ex2_intro/