1 (**************************************************************************)
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 *)
13 (**************************************************************************)
15 include "basic_2/relocation/drops.ma".
17 (* GENERIC SLICING FOR LOCAL ENVIRONMENTS ***********************************)
19 (* Properties with entrywise extension of context-sensitive relations *******)
21 (* Basic_2A1: includes: lpx_sn_deliftable_dropable *)
22 lemma lexs_deliftable_dropable: ∀RN,RP. d_deliftable2_sn RN → d_deliftable2_sn RP →
23 dropable_sn (lexs RN RP).
24 #RN #RP #HN #HP #b #f #L1 #K1 #H elim H -f -L1 -K1
25 [ #f #Hf #X #f2 #H #f1 #Hf2 >(lexs_inv_atom1 … H) -X
26 /4 width=3 by lexs_atom, drops_atom, ex2_intro/
27 | #f #I #L1 #K1 #V1 #_ #IH #X #f2 #H #f1 #Hf2 elim (coafter_inv_nxx … Hf2) -Hf2 [2,3: // ]
28 #g2 #Hg2 #H2 destruct elim (lexs_inv_push1 … H) -H
29 #L2 #V2 #HL12 #HV12 #H destruct elim (IH … HL12 … Hg2) -g2
30 /3 width=3 by drops_drop, ex2_intro/
31 | #f #I #L1 #K1 #V1 #W1 #HLK #HWV #IH #X #f2 #H #f1 #Hf2 elim (coafter_inv_pxx … Hf2) -Hf2 [1,3:* |*: // ]
32 #g1 #g2 #Hg2 #H1 #H2 destruct
33 [ elim (lexs_inv_push1 … H) | elim (lexs_inv_next1 … H) ] -H
34 #L2 #V2 #HL12 #HV12 #H destruct elim (IH … HL12 … Hg2) -g2
35 [ elim (HP … HV12 … HLK … HWV) | elim (HN … HV12 … HLK … HWV) ] -V1
36 /3 width=5 by lexs_next, lexs_push, drops_skip, ex2_intro/
40 (* Basic_2A1: includes: lpx_sn_liftable_dedropable *)
41 lemma lexs_liftable_dedropable: ∀RN,RP. (∀L. reflexive ? (RN L)) → (∀L. reflexive ? (RP L)) →
42 d_liftable2 RN → d_liftable2 RP → dedropable_sn (lexs RN RP).
43 #RN #RP #H1RN #H1RP #H2RN #H2RP #b #f #L1 #K1 #H elim H -f -L1 -K1
44 [ #f #Hf #X #f1 #H #f2 #Hf2 >(lexs_inv_atom1 … H) -X
45 /4 width=4 by drops_atom, lexs_atom, ex3_intro/
46 | #f #I #L1 #K1 #V1 #_ #IHLK1 #K2 #f1 #HK12 #f2 #Hf2
47 elim (coafter_inv_nxx … Hf2) -Hf2 [2,3: // ] #g2 #Hg2 #H destruct
48 elim (IHLK1 … HK12 … Hg2) -K1
49 /3 width=6 by drops_drop, lexs_next, lexs_push, ex3_intro/
50 | #f #I #L1 #K1 #V1 #W1 #HLK1 #HWV1 #IHLK1 #X #f1 #H #f2 #Hf2
51 elim (coafter_inv_pxx … Hf2) -Hf2 [1,3: * |*: // ] #g1 #g2 #Hg2 #H1 #H2 destruct
52 [ elim (lexs_inv_push1 … H) | elim (lexs_inv_next1 … H) ] -H #K2 #W2 #HK12 #HW12 #H destruct
53 [ elim (H2RP … HW12 … HLK1 … HWV1) | elim (H2RN … HW12 … HLK1 … HWV1) ] -W1
54 elim (IHLK1 … HK12 … Hg2) -K1
55 /3 width=6 by drops_skip, lexs_next, lexs_push, ex3_intro/
59 fact lexs_dropable_aux: ∀RN,RP,b,f,L2,K2. ⬇*[b, f] L2 ≡ K2 → 𝐔⦃f⦄ →
60 ∀f2,L1. L1 ⦻*[RN, RP, f2] L2 → ∀f1. f ~⊚ f1 ≡ f2 →
61 ∃∃K1. ⬇*[b, f] L1 ≡ K1 & K1 ⦻*[RN, RP, f1] K2.
62 #RN #RP #b #f #L2 #K2 #H elim H -f -L2 -K2
63 [ #f #Hf #_ #f2 #X #H #f1 #Hf2 lapply (lexs_inv_atom2 … H) -H
64 #H destruct /4 width=3 by lexs_atom, drops_atom, ex2_intro/
65 | #f #I #L2 #K2 #V2 #_ #IH #Hf #f2 #X #HX #f1 #Hf2
66 elim (coafter_inv_nxx … Hf2) -Hf2 [2,3: // ] #g2 #Hg2 #H destruct
67 elim (lexs_inv_push2 … HX) -HX #L1 #V1 #HL12 #HV12 #H destruct
68 elim (IH … HL12 … Hg2) -L2 -V2 -g2
69 /3 width=3 by drops_drop, isuni_inv_next, ex2_intro/
70 | #f #I #L2 #K2 #V2 #W2 #_ #HWV2 #IH #Hf #f2 #X #HX #f1 #Hf2
71 elim (coafter_inv_pxx … Hf2) -Hf2 [1,3: * |*: // ] #g1 #g2 #Hg2 #H1 #H2 destruct
72 [ elim (lexs_inv_push2 … HX) | elim (lexs_inv_next2 … HX) ] -HX #L1 #V1 #HL12 #HV12 #H destruct
73 elim (IH … HL12 … Hg2) -L2 -g2 /2 width=3 by isuni_fwd_push/ #K1 #HLK1 #HK12
74 lapply (isuni_inv_push … Hf ??) -Hf [3,6: |*: // ] #Hf
75 lapply (lifts_fwd_isid … HWV2 … Hf) #H destruct -HWV2
76 lapply (drops_fwd_isid … HLK1 … Hf) #H destruct -HLK1
77 /4 width=5 by lexs_next, lexs_push, drops_refl, isid_push, ex2_intro/
81 (* Basic_2A1: includes: lpx_sn_dropable *)
82 lemma lexs_dropable: ∀RN,RP. dropable_dx (lexs RN RP).
83 /2 width=5 by lexs_dropable_aux/ qed-.
85 (* Basic_2A1: includes: lpx_sn_drop_conf *)
86 lemma lexs_drops_conf_next: ∀RN,RP. d_deliftable2_sn RN → d_deliftable2_sn RP →
87 ∀f2,L1,L2. L1 ⦻*[RN, RP, f2] L2 →
88 ∀b,f,I,K1,V1. ⬇*[b,f] L1 ≡ K1.ⓑ{I}V1 →
90 ∃∃K2,V2. ⬇*[b,f] L2 ≡ K2.ⓑ{I}V2 & K1 ⦻*[RN, RP, f1] K2 & RN K1 V1 V2.
91 #RN #RP #HRN #HRP #f2 #L1 #L2 #HL12 #b #f #I #K1 #V1 #HLK1 #f1 #Hf2
92 elim (lexs_deliftable_dropable … HRN HRP … HLK1 … HL12 … Hf2) -L1 -f2 -HRN -HRP
93 #X #HX #HLK2 elim (lexs_inv_next1 … HX) -HX
94 #K2 #V2 #HK12 #HV12 #H destruct /2 width=5 by ex3_2_intro/
97 lemma lexs_drops_conf_push: ∀RN,RP. d_deliftable2_sn RN → d_deliftable2_sn RP →
98 ∀f2,L1,L2. L1 ⦻*[RN, RP, f2] L2 →
99 ∀b,f,I,K1,V1. ⬇*[b,f] L1 ≡ K1.ⓑ{I}V1 →
101 ∃∃K2,V2. ⬇*[b,f] L2 ≡ K2.ⓑ{I}V2 & K1 ⦻*[RN, RP, f1] K2 & RP K1 V1 V2.
102 #RN #RP #HRN #HRP #f2 #L1 #L2 #HL12 #b #f #I #K1 #V1 #HLK1 #f1 #Hf2
103 elim (lexs_deliftable_dropable … HRN HRP … HLK1 … HL12 … Hf2) -L1 -f2 -HRN -HRP
104 #X #HX #HLK2 elim (lexs_inv_push1 … HX) -HX
105 #K2 #V2 #HK12 #HV12 #H destruct /2 width=5 by ex3_2_intro/
108 (* Basic_2A1: includes: lpx_sn_drop_trans *)
109 lemma lexs_drops_trans_next: ∀RN,RP,f2,L1,L2. L1 ⦻*[RN, RP, f2] L2 →
110 ∀b,f,I,K2,V2. ⬇*[b,f] L2 ≡ K2.ⓑ{I}V2 → 𝐔⦃f⦄ →
112 ∃∃K1,V1. ⬇*[b,f] L1 ≡ K1.ⓑ{I}V1 & K1 ⦻*[RN, RP, f1] K2 & RN K1 V1 V2.
113 #RN #RP #f2 #L1 #L2 #HL12 #b #f #I #K1 #V1 #HLK1 #Hf #f1 #Hf2
114 elim (lexs_dropable … HL12 … HLK1 … Hf … Hf2) -L2 -f2 -Hf
115 #X #HLK1 #HX elim (lexs_inv_next2 … HX) -HX
116 #K1 #V1 #HK12 #HV12 #H destruct /2 width=5 by ex3_2_intro/
119 lemma lexs_drops_trans_push: ∀RN,RP,f2,L1,L2. L1 ⦻*[RN, RP, f2] L2 →
120 ∀b,f,I,K2,V2. ⬇*[b,f] L2 ≡ K2.ⓑ{I}V2 → 𝐔⦃f⦄ →
122 ∃∃K1,V1. ⬇*[b,f] L1 ≡ K1.ⓑ{I}V1 & K1 ⦻*[RN, RP, f1] K2 & RP K1 V1 V2.
123 #RN #RP #f2 #L1 #L2 #HL12 #b #f #I #K1 #V1 #HLK1 #Hf #f1 #Hf2
124 elim (lexs_dropable … HL12 … HLK1 … Hf … Hf2) -L2 -f2 -Hf
125 #X #HLK1 #HX elim (lexs_inv_push2 … HX) -HX
126 #K1 #V1 #HK12 #HV12 #H destruct /2 width=5 by ex3_2_intro/
129 lemma drops_lexs_trans_next: ∀RN,RP. (∀L. reflexive ? (RN L)) → (∀L. reflexive ? (RP L)) →
130 d_liftable2 RN → d_liftable2 RP →
131 ∀f1,K1,K2. K1 ⦻*[RN, RP, f1] K2 →
132 ∀b,f,I,L1,V1. ⬇*[b,f] L1.ⓑ{I}V1 ≡ K1 →
134 ∃∃L2,V2. ⬇*[b,f] L2.ⓑ{I}V2 ≡ K2 & L1 ⦻*[RN, RP, f2] L2 & RN L1 V1 V2 & L1.ⓑ{I}V1≡[f]L2.ⓑ{I}V2.
135 #RN #RP #H1RN #H1RP #H2RN #H2RP #f1 #K1 #K2 #HK12 #b #f #I #L1 #V1 #HLK1 #f2 #Hf2
136 elim (lexs_liftable_dedropable … H1RN H1RP H2RN H2RP … HLK1 … HK12 … Hf2) -K1 -f1 -H1RN -H1RP -H2RN -H2RP
137 #X #HX #HLK2 #H1L12 elim (lexs_inv_next1 … HX) -HX
138 #L2 #V2 #H2L12 #HV12 #H destruct /2 width=6 by ex4_2_intro/
141 lemma drops_lexs_trans_push: ∀RN,RP. (∀L. reflexive ? (RN L)) → (∀L. reflexive ? (RP L)) →
142 d_liftable2 RN → d_liftable2 RP →
143 ∀f1,K1,K2. K1 ⦻*[RN, RP, f1] K2 →
144 ∀b,f,I,L1,V1. ⬇*[b,f] L1.ⓑ{I}V1 ≡ K1 →
146 ∃∃L2,V2. ⬇*[b,f] L2.ⓑ{I}V2 ≡ K2 & L1 ⦻*[RN, RP, f2] L2 & RP L1 V1 V2 & L1.ⓑ{I}V1≡[f]L2.ⓑ{I}V2.
147 #RN #RP #H1RN #H1RP #H2RN #H2RP #f1 #K1 #K2 #HK12 #b #f #I #L1 #V1 #HLK1 #f2 #Hf2
148 elim (lexs_liftable_dedropable … H1RN H1RP H2RN H2RP … HLK1 … HK12 … Hf2) -K1 -f1 -H1RN -H1RP -H2RN -H2RP
149 #X #HX #HLK2 #H1L12 elim (lexs_inv_push1 … HX) -HX
150 #L2 #V2 #H2L12 #HV12 #H destruct /2 width=6 by ex4_2_intro/