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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/unfold/gr2_gr2.ma".
16 include "Basic_2/unfold/lifts_lifts.ma".
17 include "Basic_2/unfold/ldrops_ldrops.ma".
18 include "Basic_2/computation/lsubc.ma".
20 (* NOTE: The constant (0) can not be generalized *)
21 axiom lsubc_ldrop_trans: ∀RP,L1,L2. L1 [RP] ⊑ L2 → ∀K2,e. ⇩[0, e] L2 ≡ K2 →
22 ∃∃K1. ⇩[0, e] L1 ≡ K1 & K1 [RP] ⊑ K2.
24 axiom ldrops_lsubc_trans: ∀RP,L1,K1,des. ⇩*[des] L1 ≡ K1 → ∀K2. K1 [RP] ⊑ K2 →
25 ∃∃L2. L1 [RP] ⊑ L2 & ⇩*[des] L2 ≡ K2.
27 axiom aaa_mono: ∀L,T,A1. L ⊢ T ÷ A1 → ∀A2. L ⊢ T ÷ A2 → A1 = A2.
29 axiom aaa_lifts: ∀L1,L2,T1,T2,A,des.
30 L1 ⊢ T1 ÷ A → ⇩*[des] L2 ≡ L1 → ⇧*[des] T1 ≡ T2 → L2 ⊢ T2 ÷ A.
32 (* ABSTRACT COMPUTATION PROPERTIES ******************************************)
34 (* Main propertis ***********************************************************)
36 theorem aacr_aaa_csubc_lifts: ∀RR,RS,RP.
37 acp RR RS RP → acr RR RS RP (λL,T. RP L T) →
38 ∀L1,T,A. L1 ⊢ T ÷ A → ∀L0,des. ⇩*[des] L0 ≡ L1 →
39 ∀T0. ⇧*[des] T ≡ T0 → ∀L2. L2 [RP] ⊑ L0 →
41 #RR #RS #RP #H1RP #H2RP #L1 #T #A #H elim H -L1 -T -A
42 [ #L #k #L0 #des #HL0 #X #H #L2 #HL20
43 >(lifts_inv_sort1 … H) -H
44 lapply (aacr_acr … H1RP H2RP 𝕒) #HAtom
45 @(s2 … HAtom … ◊) // /2 width=2/
46 | #I #L1 #K1 #V1 #B #i #HLK1 #HKV1B #IHB #L0 #des #HL01 #X #H #L2 #HL20
47 lapply (aacr_acr … H1RP H2RP B) #HB
48 elim (lifts_inv_lref1 … H) -H #i1 #Hi1 #H destruct
49 lapply (ldrop_fwd_ldrop2 … HLK1) #HK1b
50 elim (ldrops_ldrop_trans … HL01 … HLK1) #X #des1 #i0 #HL0 #H #Hi0 #Hdes1
51 >(at_mono … Hi1 … Hi0) -i1
52 elim (ldrops_inv_skip2 … Hdes1 … H) -des1 #K0 #V0 #des0 #Hdes0 #HK01 #HV10 #H destruct
53 elim (lsubc_ldrop_trans … HL20 … HL0) -HL0 #X #HLK2 #H
54 elim (lsubc_inv_pair2 … H) -H *
55 [ #K2 #HK20 #H destruct
56 generalize in match HLK2; generalize in match I; -HLK2 -I * #HLK2
57 [ elim (lift_total V0 0 (i0 +1)) #V #HV0
58 elim (lifts_lift_trans … HV10 … HV0 … Hi0 Hdes0) -HV10 #V2 #HV12 #HV2
59 @(s4 … HB … ◊ … HV0 HLK2) /3 width=7/ (* uses IHB HL20 V2 HV0 *)
60 | @(s2 … HB … ◊) // /2 width=3/
62 | -HLK1 -IHB -HL01 -HL20 -HK1b -Hi0 -Hdes0
63 #K2 #V2 #A2 #HKV2A #HKV0A #_ #H1 #H2 destruct
64 lapply (ldrop_fwd_ldrop2 … HLK2) #HLK2b
65 lapply (aaa_lifts … HKV1B HK01 HV10) -HKV1B -HK01 -HV10 #HKV0B
66 >(aaa_mono … HKV0A … HKV0B) in HKV2A; -HKV0A -HKV0B #HKV2B
67 elim (lift_total V2 0 (i0 +1)) #V #HV2
68 @(s4 … HB … ◊ … HV2 HLK2)
71 | #L #V #T #B #A #_ #_ #IHB #IHA #L0 #des #HL0 #X #H #L2 #HL20
72 elim (lifts_inv_bind1 … H) -H #V0 #T0 #HV0 #HT0 #H destruct
73 lapply (aacr_acr … H1RP H2RP A) #HA
74 lapply (aacr_acr … H1RP H2RP B) #HB
75 lapply (s1 … HB) -HB #HB
76 @(s5 … HA … ◊ ◊) // /3 width=5/
77 | #L #W #T #B #A #HLWB #_ #IHB #IHA #L0 #des #HL0 #X #H #L2 #HL02
78 elim (lifts_inv_bind1 … H) -H #W0 #T0 #HW0 #HT0 #H destruct
79 @(aacr_abst … H1RP H2RP)
80 [ lapply (aacr_acr … H1RP H2RP B) #HB
81 @(s1 … HB) /2 width=5/
83 #L3 #V3 #T3 #des3 #HL32 #HT03 #HB
84 elim (lifts_total des3 W0) #W2 #HW02
85 elim (ldrops_lsubc_trans … HL32 … HL02) -L2 #L2 #HL32 #HL20
86 lapply (aaa_lifts ? L2 ? W2 ? (des @ des3) HLWB ? ?) -HLWB /2 width=3/ #HLW2B
87 @(IHA (L2. 𝕓{Abst} W2) … (des + 1 @ des3 + 1)) -IHA
88 /2 width=3/ /3 width=5/
90 | #L #V #T #B #A #_ #_ #IHB #IHA #L0 #des #HL0 #X #H #L2 #HL20
91 elim (lifts_inv_flat1 … H) -H #V0 #T0 #HV0 #HT0 #H destruct
93 | #L #V #T #A #_ #_ #IH1A #IH2A #L0 #des #HL0 #X #H #L2 #HL20
94 elim (lifts_inv_flat1 … H) -H #V0 #T0 #HV0 #HT0 #H destruct
95 lapply (aacr_acr … H1RP H2RP A) #HA
97 @(s6 … HA … ◊) /2 width=5/ /3 width=5/
101 lemma aacr_aaa: ∀RR,RS,RP. acp RR RS RP → acr RR RS RP (λL,T. RP L T) →
102 ∀L,T,A. L ⊢ T ÷ A → ⦃L, T⦄ [RP] ϵ 〚A〛.
105 lemma acp_aaa: ∀RR,RS,RP. acp RR RS RP → acr RR RS RP (λL,T. RP L T) →
106 ∀L,T,A. L ⊢ T ÷ A → RP L T.
107 #RR #RS #RP #H1RP #H2RP #L #T #A #HT
108 lapply (aacr_acr … H1RP H2RP A) #HA
109 @(s1 … HA) /2 width=4/