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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/rt_transition/cpg_drops.ma".
16 include "basic_2/rt_transition/cpm.ma".
18 (* T-BOUND CONTEXT-SENSITIVE PARALLEL RT-TRANSITION FOR TERMS ***************)
20 (* Properties with generic slicing for local environments *******************)
22 (* Basic_1: includes: pr0_lift pr2_lift *)
23 (* Basic_2A1: includes: cpr_lift *)
24 lemma cpm_lifts_sn (h) (n) (G): d_liftable2_sn … lifts (λL. cpm h G L n).
25 #h #n #G #K #T1 #T2 * #c #Hc #HT12 #b #f #L #HLK #U1 #HTU1
26 elim (cpg_lifts_sn … HT12 … HLK … HTU1) -K -T1
27 /3 width=5 by ex2_intro/
30 lemma cpm_lifts_bi (h) (n) (G): d_liftable2_bi … lifts (λL. cpm h G L n).
31 #h #n #G #K #T1 #T2 * /3 width=11 by cpg_lifts_bi, ex2_intro/
34 (* Inversion lemmas with generic slicing for local environments *************)
36 (* Basic_1: includes: pr0_gen_lift pr2_gen_lift *)
37 (* Basic_2A1: includes: cpr_inv_lift1 *)
38 lemma cpm_inv_lifts_sn (h) (n) (G): d_deliftable2_sn … lifts (λL. cpm h G L n).
39 #h #n #G #L #U1 #U2 * #c #Hc #HU12 #b #f #K #HLK #T1 #HTU1
40 elim (cpg_inv_lifts_sn … HU12 … HLK … HTU1) -L -U1
41 /3 width=5 by ex2_intro/
44 lemma cpm_inv_lifts_bi (h) (n) (G): d_deliftable2_bi … lifts (λL. cpm h G L n).
45 #h #n #G #L #U1 #U2 * /3 width=11 by cpg_inv_lifts_bi, ex2_intro/
48 (* Advanced properties ******************************************************)
50 (* Basic_1: includes: pr2_delta1 *)
51 (* Basic_2A1: includes: cpr_delta *)
52 lemma cpm_delta_drops (h) (n) (G) (L):
54 ⇩[i] L ≘ K.ⓓV → ❪G,K❫ ⊢ V ➡[h,n] V2 →
55 ⇧[↑i] V2 ≘ W2 → ❪G,L❫ ⊢ #i ➡[h,n] W2.
56 #h #n #G #L #K #V #V2 #W2 #i #HLK *
57 /3 width=8 by cpg_delta_drops, ex2_intro/
60 lemma cpm_ell_drops (h) (n) (G) (L):
62 ⇩[i] L ≘ K.ⓛV → ❪G,K❫ ⊢ V ➡[h,n] V2 →
63 ⇧[↑i] V2 ≘ W2 → ❪G,L❫ ⊢ #i ➡[h,↑n] W2.
64 #h #n #G #L #K #V #V2 #W2 #i #HLK *
65 /3 width=8 by cpg_ell_drops, isrt_succ, ex2_intro/
68 (* Advanced inversion lemmas ************************************************)
70 lemma cpm_inv_atom1_drops (h) (n) (G) (L):
71 ∀I,T2. ❪G,L❫ ⊢ ⓪[I] ➡[h,n] T2 →
72 ∨∨ ∧∧ T2 = ⓪[I] & n = 0
73 | ∃∃s. T2 = ⋆(⫯[h]s) & I = Sort s & n = 1
74 | ∃∃K,V,V2,i. ⇩[i] L ≘ K.ⓓV & ❪G,K❫ ⊢ V ➡[h,n] V2 & ⇧[↑i] V2 ≘ T2 & I = LRef i
75 | ∃∃m,K,V,V2,i. ⇩[i] L ≘ K.ⓛV & ❪G,K❫ ⊢ V ➡[h,m] V2 & ⇧[↑i] V2 ≘ T2 & I = LRef i & n = ↑m.
76 #h #n #G #L #I #T2 * #c #Hc #H elim (cpg_inv_atom1_drops … H) -H *
77 [ #H1 #H2 destruct lapply (isrt_inv_00 … Hc) -Hc
78 /3 width=1 by or4_intro0, conj/
79 | #s1 #s2 #H1 #H2 #H3 #H4 destruct lapply (isrt_inv_01 … Hc) -Hc
80 /4 width=3 by or4_intro1, ex3_intro, sym_eq/ (**) (* sym_eq *)
81 | #cV #i #K #V1 #V2 #HLK #HV12 #HVT2 #H1 #H2 destruct
82 /4 width=8 by ex4_4_intro, ex2_intro, or4_intro2/
83 | #cV #i #K #V1 #V2 #HLK #HV12 #HVT2 #H1 #H2 destruct
84 elim (isrt_inv_plus_SO_dx … Hc) -Hc
85 /4 width=10 by ex5_5_intro, ex2_intro, or4_intro3/
89 lemma cpm_inv_lref1_drops (h) (n) (G) (L):
90 ∀T2,i. ❪G,L❫ ⊢ #i ➡[h,n] T2 →
92 | ∃∃K,V,V2. ⇩[i] L ≘ K.ⓓV & ❪G,K❫ ⊢ V ➡[h,n] V2 & ⇧[↑i] V2 ≘ T2
93 | ∃∃m,K,V,V2. ⇩[i] L ≘ K. ⓛV & ❪G,K❫ ⊢ V ➡[h,m] V2 & ⇧[↑i] V2 ≘ T2 & n = ↑m.
94 #h #n #G #L #T2 #i * #c #Hc #H elim (cpg_inv_lref1_drops … H) -H *
95 [ #H1 #H2 destruct lapply (isrt_inv_00 … Hc) -Hc
96 /3 width=1 by or3_intro0, conj/
97 | #cV #K #V1 #V2 #HLK #HV12 #HVT2 #H destruct
98 /4 width=6 by ex3_3_intro, ex2_intro, or3_intro1/
99 | #cV #K #V1 #V2 #HLK #HV12 #HVT2 #H destruct
100 elim (isrt_inv_plus_SO_dx … Hc) -Hc
101 /4 width=8 by ex4_4_intro, ex2_intro, or3_intro2/
105 (* Advanced forward lemmas **************************************************)
107 fact cpm_fwd_plus_aux (h) (n) (G) (L):
108 ∀T1,T2. ❪G,L❫ ⊢ T1 ➡[h,n] T2 →
110 ∃∃T. ❪G,L❫ ⊢ T1 ➡[h,n1] T & ❪G,L❫ ⊢ T ➡[h,n2] T2.
111 #h #n #G #L #T1 #T2 #H @(cpm_ind … H) -G -L -T1 -T2 -n
112 [ #I #G #L #n1 #n2 #H
113 elim (plus_inv_O3 … H) -H #H1 #H2 destruct
114 /2 width=3 by ex2_intro/
115 | #G #L #s #x1 #n2 #H
116 elim (plus_inv_S3_sn … H) -H *
117 [ #H1 #H2 destruct /2 width=3 by ex2_intro/
118 | #n1 #H1 #H elim (plus_inv_O3 … H) -H #H2 #H3 destruct
119 /2 width=3 by ex2_intro/
121 | #n #G #K #V1 #V2 #W2 #_ #IH #HVW2 #n1 #n2 #H destruct
122 elim IH [|*: // ] -IH #V #HV1 #HV2
123 elim (lifts_total V 𝐔❨↑O❩) #W #HVW
124 /5 width=11 by cpm_lifts_bi, cpm_delta, drops_refl, drops_drop, ex2_intro/
125 | #n #G #K #V1 #V2 #W2 #HV12 #IH #HVW2 #x1 #n2 #H
126 elim (plus_inv_S3_sn … H) -H *
127 [ #H1 #H2 destruct -IH /3 width=3 by cpm_ell, ex2_intro/
128 | #n1 #H1 #H2 destruct -HV12
129 elim (IH n1) [|*: // ] -IH #V #HV1 #HV2
130 elim (lifts_total V 𝐔❨↑O❩) #W #HVW
131 /5 width=11 by cpm_lifts_bi, cpm_ell, drops_refl, drops_drop, ex2_intro/
133 | #n #I #G #K #T2 #U2 #i #_ #IH #HTU2 #n1 #n2 #H destruct
134 elim IH [|*: // ] -IH #T #HT1 #HT2
135 elim (lifts_total T 𝐔❨↑O❩) #U #HTU
136 /5 width=11 by cpm_lifts_bi, cpm_lref, drops_refl, drops_drop, ex2_intro/
137 | #n #p #I #G #L #V1 #V2 #T1 #T2 #HV12 #_ #_ #IHT #n1 #n2 #H destruct
138 elim IHT [|*: // ] -IHT #T #HT1 #HT2
139 /3 width=5 by cpm_bind, ex2_intro/
140 | #n #G #L #V1 #V2 #T1 #T2 #HV12 #_ #_ #IHT #n1 #n2 #H destruct
141 elim IHT [|*: // ] -IHT #T #HT1 #HT2
142 /3 width=5 by cpm_appl, ex2_intro/
143 | #n #G #L #U1 #U2 #T1 #T2 #_ #_ #IHU #IHT #n1 #n2 #H destruct
144 elim IHU [|*: // ] -IHU #U #HU1 #HU2
145 elim IHT [|*: // ] -IHT #T #HT1 #HT2
146 /3 width=5 by cpm_cast, ex2_intro/
147 | #n #G #K #V #U1 #T1 #T2 #HTU1 #_ #IH #n1 #n2 #H destruct
148 elim IH [|*: // ] -IH #T #HT1 #HT2
149 /3 width=3 by cpm_zeta, ex2_intro/
150 | #n #G #L #U #T1 #T2 #_ #IH #n1 #n2 #H destruct
151 elim IH [|*: // ] -IH #T #HT1 #HT2
152 /3 width=3 by cpm_eps, ex2_intro/
153 | #n #G #L #U1 #U2 #T #HU12 #IH #x1 #n2 #H
154 elim (plus_inv_S3_sn … H) -H *
155 [ #H1 #H2 destruct -IH /3 width=4 by cpm_ee, cpm_cast, ex2_intro/
156 | #n1 #H1 #H2 destruct -HU12
157 elim (IH n1) [|*: // ] -IH #U #HU1 #HU2
158 /3 width=3 by cpm_ee, ex2_intro/
160 | #n #p #G #L #V1 #V2 #W1 #W2 #T1 #T2 #HV12 #HW12 #_ #_ #_ #IH #n1 #n2 #H destruct
161 elim IH [|*: // ] -IH #T #HT1 #HT2
162 /4 width=7 by cpm_beta, cpm_appl, cpm_bind, ex2_intro/
163 | #n #p #G #L #V1 #V2 #U2 #W1 #W2 #T1 #T2 #HV12 #HW12 #_ #_ #_ #IH #HVU2 #n1 #n2 #H destruct
164 elim IH [|*: // ] -IH #T #HT1 #HT2
165 /4 width=7 by cpm_theta, cpm_appl, cpm_bind, ex2_intro/
169 lemma cpm_fwd_plus (h) (G) (L):
170 ∀n1,n2,T1,T2. ❪G,L❫ ⊢ T1 ➡[h,n1+n2] T2 →
171 ∃∃T. ❪G,L❫ ⊢ T1 ➡[h,n1] T & ❪G,L❫ ⊢ T ➡[h,n2] T2.
172 /2 width=3 by cpm_fwd_plus_aux/ qed-.