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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 "static_2/static/reqx_drops.ma".
16 include "static_2/static/reqx_fqup.ma".
17 include "static_2/static/reqx_reqx.ma".
18 include "basic_2/rt_transition/rpx_fsle.ma".
20 (* EXTENDED PARALLEL RT-TRANSITION FOR REFERRED LOCAL ENVIRONMENTS **********)
22 (* Properties with sort-irrelevant equivalence for local environments *******)
24 lemma rpx_pair_sn_split (G):
25 ∀L1,L2,V. ❪G,L1❫ ⊢ ⬈[V] L2 → ∀I,T.
26 ∃∃L. ❪G,L1❫ ⊢ ⬈[②[I]V.T] L & L ≛[V] L2.
27 /3 width=5 by rpx_fsge_comp, rex_pair_sn_split/ qed-.
29 lemma rpx_flat_dx_split (G):
30 ∀L1,L2,T. ❪G,L1❫ ⊢ ⬈[T] L2 → ∀I,V.
31 ∃∃L. ❪G,L1❫ ⊢ ⬈[ⓕ[I]V.T] L & L ≛[T] L2.
32 /3 width=5 by rpx_fsge_comp, rex_flat_dx_split/ qed-.
34 lemma rpx_bind_dx_split (G):
35 ∀I,L1,L2,V1,T. ❪G,L1.ⓑ[I]V1❫ ⊢ ⬈[T] L2 → ∀p.
36 ∃∃L,V. ❪G,L1❫ ⊢ ⬈[ⓑ[p,I]V1.T] L & L.ⓑ[I]V ≛[T] L2 & ❪G,L1❫ ⊢ V1 ⬈ V.
37 /3 width=5 by rpx_fsge_comp, rex_bind_dx_split/ qed-.
39 lemma rpx_bind_dx_split_void (G):
40 ∀K1,L2,T. ❪G,K1.ⓧ❫ ⊢ ⬈[T] L2 → ∀p,I,V.
41 ∃∃K2. ❪G,K1❫ ⊢ ⬈[ⓑ[p,I]V.T] K2 & K2.ⓧ ≛[T] L2.
42 /3 width=5 by rpx_fsge_comp, rex_bind_dx_split_void/ qed-.
44 lemma rpx_teqx_conf (G): s_r_confluent1 … cdeq (rpx G).
45 /2 width=5 by teqx_rex_conf/ qed-.
47 lemma rpx_teqx_div (G):
48 ∀T1,T2. T1 ≛ T2 → ∀L1,L2. ❪G,L1❫ ⊢ ⬈[T2] L2 → ❪G,L1❫ ⊢ ⬈[T1] L2.
49 /2 width=5 by teqx_rex_div/ qed-.
51 lemma cpx_teqx_conf_rex (G): R_confluent2_rex … (cpx G) cdeq (cpx G) cdeq.
52 #G #L0 #T0 #T1 #H @(cpx_ind … H) -G -L0 -T0 -T1 /2 width=3 by ex2_intro/
53 [ #G #L0 #s0 #s1 #X0 #H0 #L1 #HL01 #L2 #HL02
54 elim (teqx_inv_sort1 … H0) -H0 #s2 #H destruct
55 /3 width=3 by teqx_sort, ex2_intro/
56 | #I #G #K0 #V0 #V1 #W1 #_ #IH #HVW1 #T2 #H0 #L1 #H1 #L2 #H2
57 >(teqx_inv_lref1 … H0) -H0
58 elim (rpx_inv_zero_pair_sn … H1) -H1 #K1 #X1 #HK01 #HX1 #H destruct
59 elim (reqx_inv_zero_pair_sn … H2) -H2 #K2 #X2 #HK02 #HX2 #H destruct
60 elim (IH X2 … HK01 … HK02) // -K0 -V0 #V #HV1 #HV2
61 elim (teqx_lifts_sn … HV1 … HVW1) -V1 /3 width=5 by cpx_delta, ex2_intro/
62 | #I0 #G #K0 #V1 #W1 #i #_ #IH #HVW1 #T2 #H0 #L1 #H1 #L2 #H2
63 >(teqx_inv_lref1 … H0) -H0
64 elim (rpx_inv_lref_bind_sn … H1) -H1 #I1 #K1 #HK01 #H destruct
65 elim (reqx_inv_lref_bind_sn … H2) -H2 #I2 #K2 #HK02 #H destruct
66 elim (IH … HK01 … HK02) [|*: //] -K0 #V #HV1 #HV2
67 elim (teqx_lifts_sn … HV1 … HVW1) -V1 /3 width=5 by cpx_lref, ex2_intro/
68 | #p #I #G #L0 #V0 #V1 #T0 #T1 #_ #_ #IHV #IHT #X0 #H0 #L1 #H1 #L2 #H2
69 elim (teqx_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #HT02 #H destruct
70 elim (rpx_inv_bind … H1) -H1 #HL01 #H1
71 elim (reqx_inv_bind … H2) -H2 #HL02 #H2
72 lapply (reqx_bind_repl_dx … H2 (BPair I V2) ?) -H2 /2 width=1 by ext2_pair/ #H2
73 elim (IHV … HV02 … HL01 … HL02) -IHV -HV02 -HL01 -HL02
74 elim (IHT … HT02 … H1 … H2) -L0 -T0
75 /3 width=5 by cpx_bind, teqx_pair, ex2_intro/
76 | #I #G #L0 #V0 #V1 #T0 #T1 #_ #_ #IHV #IHT #X0 #H0 #L1 #H1 #L2 #H2
77 elim (teqx_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #HT02 #H destruct
78 elim (rpx_inv_flat … H1) -H1 #HL01 #H1
79 elim (reqx_inv_flat … H2) -H2 #HL02 #H2
80 elim (IHV … HV02 … HL01 … HL02) -IHV -HV02 -HL01 -HL02
81 elim (IHT … HT02 … H1 … H2) -L0 -V0 -T0
82 /3 width=5 by cpx_flat, teqx_pair, ex2_intro/
83 | #G #L0 #V0 #U0 #T0 #T1 #HTU0 #_ #IH #X0 #H0 #L1 #H1 #L2 #H2
84 elim (teqx_inv_pair1 … H0) -H0 #V2 #U2 #HV02 #HU02 #H destruct
85 elim (rpx_inv_bind … H1) -H1 #HL01 #H1
86 elim (reqx_inv_bind … H2) -H2 #HL02 #H2
87 lapply (rpx_inv_lifts_bi … H1 (Ⓣ) … HTU0) -H1 [6:|*: /3 width=2 by drops_refl, drops_drop/ ] #H1
88 lapply (reqx_inv_lifts_bi … H2 (Ⓣ) … HTU0) -H2 [6:|*: /3 width=2 by drops_refl, drops_drop/ ] #H2
89 elim (teqx_inv_lifts_sn … HU02 … HTU0) -U0 #T2 #HTU2 #HT02
90 elim (IH … HT02 … H1 … H2) -L0 -T0 #T #HT1
91 /3 width=5 by cpx_zeta, ex2_intro/
92 | #G #L0 #V0 #T0 #T1 #_ #IH #X0 #H0 #L1 #H1 #L2 #H2
93 elim (teqx_inv_pair1 … H0) -H0 #V2 #T2 #_ #HT02 #H destruct
94 elim (rpx_inv_flat … H1) -H1 #HL01 #H1
95 elim (reqx_inv_flat … H2) -H2 #HL02 #H2
96 elim (IH … HT02 … H1 … H2) -L0 -V0 -T0
97 /3 width=3 by cpx_eps, ex2_intro/
98 | #G #L0 #V0 #T0 #T1 #_ #IH #X0 #H0 #L1 #H1 #L2 #H2
99 elim (teqx_inv_pair1 … H0) -H0 #V2 #T2 #HV02 #_ #H destruct
100 elim (rpx_inv_flat … H1) -H1 #HL01 #H1
101 elim (reqx_inv_flat … H2) -H2 #HL02 #H2
102 elim (IH … HV02 … HL01 … HL02) -L0 -V0 -T1
103 /3 width=3 by cpx_ee, ex2_intro/
104 | #p #G #L0 #V0 #V1 #W0 #W1 #T0 #T1 #_ #_ #_ #IHV #IHW #IHT #X0 #H0 #L1 #H1 #L2 #H2
105 elim (teqx_inv_pair1 … H0) -H0 #V2 #X #HV02 #H0 #H destruct
106 elim (teqx_inv_pair1 … H0) -H0 #W2 #T2 #HW02 #HT02 #H destruct
107 elim (rpx_inv_flat … H1) -H1 #H1LV0 #H1
108 elim (rpx_inv_bind … H1) -H1 #H1LW0 #H1LT0
109 elim (reqx_inv_flat … H2) -H2 #H2LV0 #H2
110 elim (reqx_inv_bind … H2) -H2 #H2LW0 #H2LT0
111 lapply (reqx_bind_repl_dx … H2LT0 (BPair Abst W2) ?) -H2LT0 /2 width=1 by ext2_pair/ #H2LT0
112 elim (IHV … HV02 … H1LV0 … H2LV0) -IHV -HV02 -H1LV0 -H2LV0
113 elim (IHW … HW02 … H1LW0 … H2LW0) -IHW -HW02 -H1LW0 -H2LW0
114 elim (IHT … HT02 … H1LT0 … H2LT0) -L0 -V0 -T0
115 /4 width=7 by cpx_beta, teqx_pair, ex2_intro/ (* note: 2 teqx_pair *)
116 | #p #G #L0 #V0 #V1 #U1 #W0 #W1 #T0 #T1 #_ #_ #_ #IHV #IHW #IHT #HVU1 #X0 #H0 #L1 #H1 #L2 #H2
117 elim (teqx_inv_pair1 … H0) -H0 #V2 #X #HV02 #H0 #H destruct
118 elim (teqx_inv_pair1 … H0) -H0 #W2 #T2 #HW02 #HT02 #H destruct
119 elim (rpx_inv_flat … H1) -H1 #H1LV0 #H1
120 elim (rpx_inv_bind … H1) -H1 #H1LW0 #H1LT0
121 elim (reqx_inv_flat … H2) -H2 #H2LV0 #H2
122 elim (reqx_inv_bind … H2) -H2 #H2LW0 #H2LT0
123 lapply (reqx_bind_repl_dx … H2LT0 (BPair Abbr W2) ?) -H2LT0 /2 width=1 by ext2_pair/ #H2LT0
124 elim (IHV … HV02 … H1LV0 … H2LV0) -IHV -HV02 -H1LV0 -H2LV0 #V #HV1
125 elim (IHW … HW02 … H1LW0 … H2LW0) -IHW -HW02 -H1LW0 -H2LW0
126 elim (IHT … HT02 … H1LT0 … H2LT0) -L0 -V0 -T0
127 elim (teqx_lifts_sn … HV1 … HVU1) -V1
128 /4 width=9 by cpx_theta, teqx_pair, ex2_intro/ (* note: 2 teqx_pair *)
132 lemma cpx_teqx_conf (G) (L):
133 ∀T0:term. ∀T1. ❪G,L❫ ⊢ T0 ⬈ T1 → ∀T2. T0 ≛ T2 →
134 ∃∃T. T1 ≛ T & ❪G,L❫ ⊢ T2 ⬈ T.
135 #G #L #T0 #T1 #HT01 #T2 #HT02
136 elim (cpx_teqx_conf_rex … HT01 … HT02 L … L) -HT01 -HT02
137 /2 width=3 by rex_refl, ex2_intro/
140 lemma teqx_cpx_trans (G) (L):
141 ∀T2. ∀T0:term. T2 ≛ T0 → ∀T1. ❪G,L❫ ⊢ T0 ⬈ T1 →
142 ∃∃T. ❪G,L❫ ⊢ T2 ⬈ T & T ≛ T1.
143 #G #L #T2 #T0 #HT20 #T1 #HT01
144 elim (cpx_teqx_conf … HT01 T2) -HT01 /3 width=3 by teqx_sym, ex2_intro/
147 (* Basic_2A1: uses: cpx_lleq_conf *)
148 lemma cpx_reqx_conf (G):
149 ∀L0,T0,T1. ❪G,L0❫ ⊢ T0 ⬈ T1 → ∀L2. L0 ≛[T0] L2 →
150 ∃∃T. ❪G,L2❫ ⊢ T0 ⬈ T & T1 ≛ T.
151 #G #L0 #T0 #T1 #HT01 #L2 #HL02
152 elim (cpx_teqx_conf_rex … HT01 T0 … L0 … HL02) -HT01 -HL02
153 /2 width=3 by rex_refl, ex2_intro/
156 (* Basic_2A1: uses: lleq_cpx_trans *)
157 lemma reqx_cpx_trans (G):
158 ∀L2,L0,T0. L2 ≛[T0] L0 → ∀T1. ❪G,L0❫ ⊢ T0 ⬈ T1 →
159 ∃∃T. ❪G,L2❫ ⊢ T0 ⬈ T & T ≛ T1.
160 #G #L2 #L0 #T0 #HL20 #T1 #HT01
161 elim (cpx_reqx_conf … HT01 L2) -HT01
162 /3 width=3 by reqx_sym, teqx_sym, ex2_intro/
165 lemma rpx_reqx_conf (G) (T): confluent2 … (rpx G T) (reqx T).
166 /3 width=6 by rpx_fsge_comp, reqx_fsge_comp, cpx_teqx_conf_rex, rex_conf/ qed-.
168 lemma reqx_rpx_trans (G) (T):
169 ∀L2,K2. ❪G,L2❫ ⊢ ⬈[T] K2 → ∀L1. L1 ≛[T] L2 →
170 ∃∃K1. ❪G,L1❫ ⊢ ⬈[T] K1 & K1 ≛[T] K2.
171 #G #T #L2 #K2 #HLK2 #L1 #HL12
172 elim (rpx_reqx_conf … HLK2 L1)
173 /3 width=3 by reqx_sym, ex2_intro/