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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/rt_computation/cpxs_fqus.ma".
16 include "basic_2/rt_computation/cpxs_reqg.ma".
17 include "basic_2/rt_computation/lpxs_feqg.ma".
18 include "basic_2/rt_computation/fpbs_lpx.ma".
19 include "basic_2/rt_computation/fpbs_cpxs.ma".
21 (* PARALLEL RST-COMPUTATION FOR CLOSURES ************************************)
23 (* Properties with extended rt-computation on full local environments ******)
26 ∀G,L1,L2,T. ❪G,L1❫ ⊢ ⬈* L2 → ❪G,L1,T❫ ≥ ❪G,L2,T❫.
27 #G #L1 #L2 #T #H @(lpxs_ind_dx … H) -L2
28 /3 width=5 by lpx_fpb, fpbs_strap1/
31 lemma fpbs_lpxs_trans:
32 ∀G1,G2,L1,L,T1,T2. ❪G1,L1,T1❫ ≥ ❪G2,L,T2❫ →
33 ∀L2. ❪G2,L❫ ⊢ ⬈* L2 → ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫.
34 #G1 #G2 #L1 #L #T1 #T2 #H1 #L2 #H @(lpxs_ind_dx … H) -L2
35 /3 width=5 by fpbs_strap1, lpx_fpb/
38 lemma lpxs_fpbs_trans:
39 ∀G1,G2,L,L2,T1,T2. ❪G1,L,T1❫ ≥ ❪G2,L2,T2❫ →
40 ∀L1. ❪G1,L1❫ ⊢ ⬈* L → ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫.
41 #G1 #G2 #L #L2 #T1 #T2 #H1 #L1 #H @(lpxs_ind_sn … H) -L1
42 /3 width=5 by fpbs_strap2, lpx_fpb/
45 (* Basic_2A1: uses: lpxs_lleq_fpbs *)
46 lemma lpxs_feqg_fpbs (S) (L):
47 reflexive … S → symmetric … S →
48 ∀G1,L1,T1. ❪G1,L1❫ ⊢ ⬈* L →
49 ∀G2,L2,T2. ❪G1,L,T1❫ ≛[S] ❪G2,L2,T2❫ → ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫.
50 /3 width=4 by lpxs_fpbs_trans, feqg_fpbs/ qed.
52 (* Properties with star-iterated structural successor for closures **********)
55 ∀G1,G2,L1,L,T1,T2. ❪G1,L1,T1❫ ⬂* ❪G2,L,T2❫ →
56 ∀L2. ❪G2,L❫ ⊢ ⬈* L2 → ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫.
57 /3 width=3 by fpbs_lpxs_trans, fqus_fpbs/ qed.
59 (* Properties with extended context-sensitive parallel rt-computation *******)
61 lemma cpxs_fqus_lpxs_fpbs:
62 ∀G1,L1,T1,T. ❪G1,L1❫ ⊢ T1 ⬈* T →
63 ∀G2,L,T2. ❪G1,L1,T❫ ⬂* ❪G2,L,T2❫ →
64 ∀L2.❪G2,L❫ ⊢ ⬈* L2 → ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫.
65 /3 width=5 by cpxs_fqus_fpbs, fpbs_lpxs_trans/ qed.
67 lemma fpbs_cpxs_teqg_fqup_lpx_trans (S):
68 reflexive … S → symmetric … S →
69 ∀G1,G3,L1,L3,T1,T3. ❪G1,L1,T1❫ ≥ ❪G3,L3,T3❫ →
70 ∀T4. ❪G3,L3❫ ⊢ T3 ⬈* T4 → ∀T5. T4 ≛[S] T5 →
71 ∀G2,L4,T2. ❪G3,L3,T5❫ ⬂+ ❪G2,L4,T2❫ →
72 ∀L2. ❪G2,L4❫ ⊢ ⬈ L2 → ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫.
73 #S #H1S #H2S #G1 #G3 #L1 #L3 #T1 #T3 #H13 #T4 #HT34 #T5 #HT45 #G2 #L4 #T2 #H34 #L2 #HL42
74 @(fpbs_lpx_trans … HL42) -L2 (**) (* full auto too slow *)
75 @(fpbs_fqup_trans … H34) -G2 -L4 -T2
76 /3 width=6 by fpbs_cpxs_trans, fpbs_teqg_trans/
79 (* Advanced properties ******************************************************)
81 (* Basic_2A1: uses: fpbs_intro_alt *)
82 lemma fpbs_intro_star (S) (G) (T) (T0) (L) (L0):
83 reflexive … S → symmetric … S →
84 ∀G1,L1,T1. ❪G1,L1❫ ⊢ T1 ⬈* T →
85 ❪G1,L1,T❫ ⬂* ❪G,L,T0❫ → ❪G,L❫ ⊢ ⬈* L0 →
86 ∀G2,L2,T2. ❪G,L0,T0❫ ≛[S] ❪G2,L2,T2❫ → ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫.
87 /3 width=8 by cpxs_fqus_lpxs_fpbs, fpbs_strap1, feqg_fpb/ qed.
89 (* Advanced inversion lemmas *************************************************)
91 (* Basic_2A1: uses: fpbs_inv_alt *)
92 lemma fpbs_inv_star (S):
93 reflexive … S → symmetric … S → Transitive … S →
94 ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫ →
95 ∃∃G,L,L0,T,T0. ❪G1,L1❫ ⊢ T1 ⬈* T & ❪G1,L1,T❫ ⬂* ❪G,L,T0❫ & ❪G,L❫ ⊢ ⬈* L0 & ❪G,L0,T0❫ ≛[S] ❪G2,L2,T2❫.
96 #S #H1S #H2S #H3S #G1 #G2 #L1 #L2 #T1 #T2 #H @(fpbs_ind_dx … H) -G1 -L1 -T1
97 [ /3 width=9 by feqg_refl, ex4_5_intro/
98 | #G1 #G0 #L1 #L0 #T1 #T0 *
99 #L3 #T3 #H13 #HT30 #HL30 #_ *
100 #G4 #L4 #L5 #T4 #T5 #HT04 #H45 #HL45 #H52
101 lapply (rpx_cpx_conf_sn … HT30 … HL30) -HL30 #HL30
102 elim (fquq_cpx_trans … H13 … HT30) -T3 #T3 #HT13 #H30
103 elim (rpx_fwd_lpx_reqg S … HL30) -HL30 // #L #HL3 #HL0
104 lapply (reqg_cpxs_trans … HT04 … HL0) -HT04 // #HT04
105 lapply (cpxs_reqg_conf_sn … HT04 … HL0) -HL0 #HL0
106 lapply (lpx_cpxs_trans … HT04 … HL3) -HT04 #HT04
107 elim (fquq_cpxs_trans … HT04 … H30) -T0 #T0 #HT30 #H04
108 lapply (cpxs_strap2 … HT13 … HT30) -T3 #HT10
109 elim (reqg_fqus_trans … H45 … HL0) -L0 // #L0 #T3 #H43 #HT35 #HL04
110 lapply (feqg_intro_dx … G4 … HL04 … HT35) -HL04 -HT35 // #H35
111 elim (lpx_fqus_trans … H43 … HL3) -L #L #T #HT4 #H3 #HL0
112 elim (fquq_cpxs_trans … HT4 … H04) -T4 #T4 #HT04 #H4
113 lapply (cpxs_trans … HT10 … HT04) -T0 #HT14
114 lapply (fqus_strap2 … H4 … H3) -G0 -L3 -T #H43
115 elim (feqg_lpxs_trans … H35 … HL45) -L4 // #L4 #HL04 #H35
116 lapply (lpxs_step_sn … HL0 … HL04) -L0 #HL4
117 lapply (feqg_trans … H35 … H52) -L5 -T5 // #H32
118 /2 width=9 by ex4_5_intro/