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/reduction/cpx_leq.ma".
16 include "basic_2/reduction/lpx_ldrop.ma".
18 (**) (* to be proved later *)
19 axiom- lleq_beta: ∀L2s,L2d,V2,W2,T2,d.
20 L2s.ⓛW2 ⋕[d+1, T2] L2d.ⓛW2 →
21 L2s.ⓓⓝW2.V2 ⋕[d+1, T2] L2d.ⓓⓝW2.V2.
23 (* SN EXTENDED PARALLEL REDUCTION FOR LOCAL ENVIRONMENTS ********************)
25 (* Properties using equivalences for local environments *********************)
27 lemma lleq_cpx_conf_leq_dx: ∀h,g,G,L1s,L1d,T1,d. L1s ⋕[d, T1] L1d → L1s ≃[d, ∞] L1d →
28 ∀T2. ⦃G, L1d⦄ ⊢ T1 ➡[h, g] T2 →
29 ∀L2s. ⦃G, L1s⦄ ⊢ ➡[h, g] L2s → L1s ≃[0, d] L2s →
30 ∀L2d. ⦃G, L1d⦄ ⊢ ➡[h, g] L2d → L1d ≃[0, d] L2d →
31 L2s ≃[d, ∞] L2d → L2s ⋕[d, T2] L2d.
32 #h #g #G #L1s #L1d #T1 #d #H elim H -L1s -L1d -T1 -d
33 [ #L1s #L1d #d #k #_ #_ #X #H2 #L2s #_ #_ #L2d #_ #_ #H3
34 lapply (leq_fwd_length … H3) -H3 #HL2sd
35 elim (cpx_inv_sort1 … H2) -H2 [| * #l #_ ]
36 #H destruct /2 width=1 by lleq_sort/
37 | #Is #Id #L1s #L1d #K1s #K1d #V1s #V1d #d #i #Hid #HLK1s #HLK1d #_ #_ #_ #IHV1d #H1 #X #H2 #L2s #H1s #H2s #L2d #H1d #H2d #H3
38 elim (ldrop_leq_conf_lt … H1 … HLK1s) -H1 /2 width=1 by ylt_inj/
39 <yminus_SO2 >yminus_inj #Y #H1 #HY
40 lapply (ldrop_mono … HY … HLK1d) -HY #H destruct
41 elim (lpx_ldrop_conf … HLK1s … H1s) -H1s #Y #H #HLK2s
42 elim (lpx_inv_pair1 … H) -H #K2s #V2s #H1s #HV12s #H destruct
43 elim (lpx_ldrop_conf … HLK1d … H1d) -H1d #Y #H #HLK2d
44 elim (lpx_inv_pair1 … H) -H #K2d #V2d #H1d #HV12d #H destruct
45 elim (ldrop_leq_conf_be … H2s … HLK1s) -H2s /2 width=1 by ylt_inj/
46 >yplus_O1 <yminus_SO2 >yminus_inj #Z #Y #X #HK12s #H
47 lapply (ldrop_mono … H … HLK2s) -H #H destruct
48 elim (ldrop_leq_conf_be … H2d … HLK1d) -H2d /2 width=1 by ylt_inj/
49 >yplus_O1 <yminus_SO2 >yminus_inj #Z #Y #X #HK12d #H
50 lapply (ldrop_mono … H … HLK2d) -H #H destruct
51 elim (ldrop_leq_conf_lt … H3 … HLK2s) -H3 /2 width=1 by ylt_inj/
52 <yminus_SO2 >yminus_inj #Y #H3 #HY
53 lapply (ldrop_mono … HY … HLK2d) -HY #H destruct
54 elim (cpx_inv_lref1 … H2) -H2 -L1s
55 [ -L1d #H destruct /3 width=15 by lleq_skip/
56 | * #Z #Y #X1 #X2 #H #HX12 #HX2 lapply (ldrop_mono … H … HLK1d) -L1d
57 #H destruct >(plus_minus_m_m d (i+1)) //
58 lapply (ldrop_fwd_ldrop2 … HLK2s) -HLK2s
59 lapply (ldrop_fwd_ldrop2 … HLK2d) -HLK2d
60 /3 width=9 by lleq_lift_ge/
62 | #I #L1s #L1d #K1s #K1d #V1 #d #i #Hdi #HLK1s #HLK1d #_ #IHV1 #H1 #X #H2 #L2s #H1s #H2s #L2d #H1d #H2d #H3
63 elim (ldrop_leq_conf_be … H1 … HLK1s) -H1 /2 width=1 by ylt_Y, yle_inj/ #Z #Y #X #H1 #HY
64 lapply (ldrop_mono … HY … HLK1d) -HY #H destruct
65 elim (lpx_ldrop_conf … HLK1s … H1s) -H1s #Y #H #HLK2s
66 elim (lpx_inv_pair1 … H) -H #K2s #V2s #H1s #HV12s #H destruct
67 elim (lpx_ldrop_conf … HLK1d … H1d) -H1d #Y #H #HLK2d
68 elim (lpx_inv_pair1 … H) -H #K2d #V2d #H1d #HV12d #H destruct
69 lapply (ldrop_leq_conf_ge … H2s … HLK1s ?) /2 width=1 by yle_inj/ #H
70 lapply (ldrop_mono … H … HLK2s) -H #H destruct
71 lapply (ldrop_leq_conf_ge … H2d … HLK1d ?) /2 width=1 by yle_inj/ #H
72 lapply (ldrop_mono … H … HLK2d) -H #H destruct
73 elim (ldrop_leq_conf_be … H3 … HLK2s) -H3 /2 width=1 by ylt_Y, yle_inj/
74 >yminus_Y_inj #Z #Y #X #H3 #HY
75 lapply (ldrop_mono … HY … HLK2d) -HY #H destruct
76 elim (cpx_inv_lref1 … H2) -H2 -L1s
77 [ -L1d #H destruct /3 width=12 by lleq_lref/
78 | * #Z #Y #X1 #X2 #H #HX12 #HX2 lapply (ldrop_mono … H … HLK1d) -L1d
80 lapply (ldrop_fwd_ldrop2 … HLK2s) -HLK2s #HLK2s
81 lapply (ldrop_fwd_ldrop2 … HLK2d) -HLK2d #HLK2d
82 @(lleq_ge … 0) /3 width=10 by lleq_lift_le/ (**) (* full auto too slow *)
84 | #L1s #L1d #d #i #HL1s #HL1d #_ #_ #X #H2 #L2s #_ #_ #L2s #_ #H2d #H3
85 lapply (leq_fwd_length … H2d) -H2d
86 lapply (leq_fwd_length … H3) -H3
87 elim (cpx_inv_lref1 … H2) -H2
88 [ #H destruct /2 width=1 by lleq_free/
89 | -L1s * #I #K1d #V1 #V2 #HLK1d
90 lapply (ldrop_fwd_length_lt2 … HLK1d) -HLK1d #H
91 elim (lt_refl_false … i) /2 width=3 by lt_to_le_to_lt/ (**) (* full auto too slow *)
93 | #L1s #L1d #d #k #_ #_ #X #H2 #L2s #_ #_ #L2d #_ #_ #H3
94 lapply (leq_fwd_length … H3) -H3 #HL2sd
95 lapply (cpx_inv_gref1 … H2) -H2
96 #H destruct /2 width=1 by lleq_gref/
97 | #a #I #L1s #L1d #V1 #T1 #d #HV1 #_ #IHV1 #IHT1 #H1 #X #H2 #L2s #H1s #H2s #L2d #H1d #H2d #H3
98 elim (cpx_inv_bind1 … H2) -H2 *
99 [ #V2 #T2 #HV12 #HT12 #H destruct
100 /5 width=5 by lpx_pair, lleq_cpx_trans_leq, lleq_bind, leq_pair, leq_succ/
101 | #T2 #HT12 #HT2X #H1 #H2 destruct >(minus_plus_m_m d 1)
102 /4 width=9 by lpx_pair, lleq_inv_lift_ge, ldrop_ldrop, leq_pair, leq_succ/
104 | #I #L1s #L1d #V1 #T1 #d #HV1 #_ #IHV1 #IHT1 #H1 #X #H2 #L2s #H1s #H2s #L2d #H1d #H2d #H3
105 elim (cpx_inv_flat1 … H2) -H2 *
106 [ #V2 #T2 #HV12 #HT12 #H destruct /3 width=1 by lleq_flat/
107 | #HT1X #H destruct /2 width=1 by/
108 | #HV1X #H destruct /2 width=1 by/
109 | #a #V2 #W1 #W2 #T0 #T2 #HV12 #HW12 #HT02 #H1 #H2 #H3 destruct
110 lapply (IHT1 … (ⓛ{a}W2.T2) … L2s … L2d ? ? ?) -IHT1 /2 width=1 by cpx_bind/ #H
111 elim (lleq_inv_bind … H) -H -HW12 -HT02 #HW2 #HT2
112 /4 width=1 by lleq_beta, lleq_flat, lleq_bind/
113 | #a #V0 #V2 #W1 #W2 #T0 #T2 #HV10 #HV02 #HW12 #HT02 #H1 #H2 #H3 destruct
114 lapply (IHT1 … (ⓓ{a}W2.T2) … L2s … L2d ? ? ?) -IHT1 /2 width=1 by cpx_bind/ #H
115 elim (lleq_inv_bind … H) -H -HW12 -HT02
116 /5 width=9 by lleq_lift_ge, lleq_flat, lleq_bind, ldrop_ldrop/
121 lemma lleq_cpx_conf_dx: ∀h,g,G,L2,T1,T2. ⦃G, L2⦄ ⊢ T1 ➡[h, g] T2 →
122 ∀L1. L1 ⋕[0, T1] L2 → L1 ⋕[0, T2] L2.
123 #h #g #G #L2 #T1 #T2 #HT12 #L1 #HT1 lapply (lleq_fwd_length … HT1)
124 /3 width=13 by lleq_cpx_conf_leq_dx, leq_O_Y/