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 (* Note: lemma 1000 *)
28 lemma lleq_cpx_conf_leq_dx: ∀h,g,G,L1s,L1d,T1,d. L1s ⋕[d, T1] L1d → L1s ≃[d, ∞] L1d →
29 ∀T2. ⦃G, L1d⦄ ⊢ T1 ➡[h, g] T2 →
30 ∀L2s. ⦃G, L1s⦄ ⊢ ➡[h, g] L2s → L1s ≃[0, d] L2s →
31 ∀L2d. ⦃G, L1d⦄ ⊢ ➡[h, g] L2d → L1d ≃[0, d] L2d →
32 L2s ≃[d, ∞] L2d → L2s ⋕[d, T2] L2d.
33 #h #g #G #L1s #L1d #T1 #d #H elim H -L1s -L1d -T1 -d
34 [ #L1s #L1d #d #k #_ #_ #X #H2 #L2s #_ #_ #L2d #_ #_ #H3
35 lapply (leq_fwd_length … H3) -H3 #HL2sd
36 elim (cpx_inv_sort1 … H2) -H2 [| * #l #_ ]
37 #H destruct /2 width=1 by lleq_sort/
38 | #Is #Id #L1s #L1d #K1s #K1d #V1s #V1d #d #i #Hid #HLK1s #HLK1d #_ #_ #_ #IHV1d #H1 #X #H2 #L2s #H1s #H2s #L2d #H1d #H2d #H3
39 elim (ldrop_leq_conf_lt … H1 … HLK1s) -H1 /2 width=1 by ylt_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/ #Z #Y #X #HK12s #H
46 lapply (ldrop_mono … H … HLK2s) -H #H destruct
47 elim (ldrop_leq_conf_be … H2d … HLK1d) -H2d /2 width=1 by ylt_inj/ #Z #Y #X #HK12d #H
48 lapply (ldrop_mono … H … HLK2d) -H #H destruct
49 elim (ldrop_leq_conf_lt … H3 … HLK2s) -H3 /2 width=1 by ylt_inj/ #Y #H3 #HY
50 lapply (ldrop_mono … HY … HLK2d) -HY #H destruct
51 elim (cpx_inv_lref1 … H2) -H2 -L1s
52 [ -L1d #H destruct /3 width=15 by lleq_skip/
53 | * #Z #Y #X1 #X2 #H #HX12 #HX2 lapply (ldrop_mono … H … HLK1d) -L1d
54 #H destruct >(plus_minus_m_m d (i+1)) //
55 lapply (ldrop_fwd_ldrop2 … HLK2s) -HLK2s
56 lapply (ldrop_fwd_ldrop2 … HLK2d) -HLK2d
57 /3 width=9 by lleq_lift_ge/
59 | #I #L1s #L1d #K1s #K1d #V1 #d #i #Hdi #HLK1s #HLK1d #_ #IHV1 #H1 #X #H2 #L2s #H1s #H2s #L2d #H1d #H2d #H3
60 elim (ldrop_leq_conf_be … H1 … HLK1s) -H1 /2 width=1 by ylt_Y, yle_inj/ #Z #Y #X #H1 #HY
61 lapply (ldrop_mono … HY … HLK1d) -HY #H destruct
62 elim (lpx_ldrop_conf … HLK1s … H1s) -H1s #Y #H #HLK2s
63 elim (lpx_inv_pair1 … H) -H #K2s #V2s #H1s #HV12s #H destruct
64 elim (lpx_ldrop_conf … HLK1d … H1d) -H1d #Y #H #HLK2d
65 elim (lpx_inv_pair1 … H) -H #K2d #V2d #H1d #HV12d #H destruct
66 lapply (ldrop_leq_conf_ge … H2s … HLK1s ?) /2 width=1 by yle_inj/ #H
67 lapply (ldrop_mono … H … HLK2s) -H #H destruct
68 lapply (ldrop_leq_conf_ge … H2d … HLK1d ?) /2 width=1 by yle_inj/ #H
69 lapply (ldrop_mono … H … HLK2d) -H #H destruct
70 elim (ldrop_leq_conf_be … H3 … HLK2s) -H3 /2 width=1 by ylt_Y, yle_inj/
71 >yminus_Y_inj #Z #Y #X #H3 #HY
72 lapply (ldrop_mono … HY … HLK2d) -HY #H destruct
73 elim (cpx_inv_lref1 … H2) -H2 -L1s
74 [ -L1d #H destruct /3 width=12 by lleq_lref/
75 | * #Z #Y #X1 #X2 #H #HX12 #HX2 lapply (ldrop_mono … H … HLK1d) -L1d
77 lapply (ldrop_fwd_ldrop2 … HLK2s) -HLK2s #HLK2s
78 lapply (ldrop_fwd_ldrop2 … HLK2d) -HLK2d #HLK2d
79 @(lleq_ge … 0) /3 width=10 by lleq_lift_le/ (**) (* full auto too slow *)
81 | #L1s #L1d #d #i #HL1s #HL1d #_ #_ #X #H2 #L2s #_ #_ #L2s #_ #H2d #H3
82 lapply (leq_fwd_length … H2d) -H2d
83 lapply (leq_fwd_length … H3) -H3
84 elim (cpx_inv_lref1 … H2) -H2
85 [ #H destruct /2 width=1 by lleq_free/
86 | -L1s * #I #K1d #V1 #V2 #HLK1d
87 lapply (ldrop_fwd_length_lt2 … HLK1d) -HLK1d #H
88 elim (lt_refl_false … i) /2 width=3 by lt_to_le_to_lt/ (**) (* full auto too slow *)
90 | #L1s #L1d #d #k #_ #_ #X #H2 #L2s #_ #_ #L2d #_ #_ #H3
91 lapply (leq_fwd_length … H3) -H3 #HL2sd
92 lapply (cpx_inv_gref1 … H2) -H2
93 #H destruct /2 width=1 by lleq_gref/
94 | #a #I #L1s #L1d #V1 #T1 #d #HV1 #_ #IHV1 #IHT1 #H1 #X #H2 #L2s #H1s #H2s #L2d #H1d #H2d #H3
95 elim (cpx_inv_bind1 … H2) -H2 *
96 [ #V2 #T2 #HV12 #HT12 #H destruct
97 /5 width=5 by lpx_pair, lleq_cpx_trans_leq, lleq_bind, leq_pair, leq_succ/
98 | #T2 #HT12 #HT2X #H1 #H2 destruct >(minus_plus_m_m d 1)
99 /4 width=9 by lpx_pair, lleq_inv_lift_ge, ldrop_ldrop, leq_pair, leq_succ/
101 | #I #L1s #L1d #V1 #T1 #d #HV1 #_ #IHV1 #IHT1 #H1 #X #H2 #L2s #H1s #H2s #L2d #H1d #H2d #H3
102 elim (cpx_inv_flat1 … H2) -H2 *
103 [ #V2 #T2 #HV12 #HT12 #H destruct /3 width=1 by lleq_flat/
104 | #HT1X #H destruct /2 width=1 by/
105 | #HV1X #H destruct /2 width=1 by/
106 | #a #V2 #W1 #W2 #T0 #T2 #HV12 #HW12 #HT02 #H1 #H2 #H3 destruct
107 lapply (IHT1 … (ⓛ{a}W2.T2) … L2s … L2d ? ? ?) -IHT1 /2 width=1 by cpx_bind/ #H
108 elim (lleq_inv_bind … H) -H -HW12 -HT02 #HW2 #HT2
109 /4 width=1 by lleq_beta, lleq_flat, lleq_bind/
110 | #a #V0 #V2 #W1 #W2 #T0 #T2 #HV10 #HV02 #HW12 #HT02 #H1 #H2 #H3 destruct
111 lapply (IHT1 … (ⓓ{a}W2.T2) … L2s … L2d ? ? ?) -IHT1 /2 width=1 by cpx_bind/ #H
112 elim (lleq_inv_bind … H) -H -HW12 -HT02
113 /5 width=9 by lleq_lift_ge, lleq_flat, lleq_bind, ldrop_ldrop/
118 lemma lleq_cpx_conf_dx: ∀h,g,G,L2,T1,T2. ⦃G, L2⦄ ⊢ T1 ➡[h, g] T2 →
119 ∀L1. L1 ⋕[0, T1] L2 → L1 ⋕[0, T2] L2.
120 #h #g #G #L2 #T1 #T2 #HT12 #L1 #HT1 lapply (lleq_fwd_length … HT1)
121 /3 width=13 by lleq_cpx_conf_leq_dx, leq_O_Y/