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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/static/aaa.ma".
19 include "Basic_2/computation/lsubc.ma".
21 (* NOTE: The constant (0) can not be generalized *)
22 axiom lsubc_ldrop_trans: ∀RP,L1,L2. L1 [RP] ⊑ L2 → ∀K2,e. ⇩[0, e] L2 ≡ K2 →
23 ∃∃K1. ⇩[0, e] L1 ≡ K1 & K1 [RP] ⊑ K2.
25 axiom ldrops_lsubc_trans: ∀RP,L1,K1,des. ⇩*[des] L1 ≡ K1 → ∀K2. K1 [RP] ⊑ K2 →
26 ∃∃L2. L1 [RP] ⊑ L2 & ⇩*[des] L2 ≡ K2.
28 (* ABSTRACT COMPUTATION PROPERTIES ******************************************)
30 (* Main propertis ***********************************************************)
32 axiom aacr_aaa_csubc_lifts: ∀RR,RS,RP.
33 acp RR RS RP → acr RR RS RP (λL,T. RP L T) →
34 ∀L1,T,A. L1 ⊢ T ÷ A → ∀L0,des. ⇩*[des] L0 ≡ L1 →
35 ∀T0. ⇧*[des] T ≡ T0 → ∀L2. L2 [RP] ⊑ L0 →
38 #RR #RS #RP #H1RP #H2RP #L1 #T #A #H elim H -L1 -T -A
39 [ #L #k #L0 #des #HL0 #X #H #L2 #HL20
40 >(lifts_inv_sort1 … H) -H
41 lapply (aacr_acr … H1RP H2RP 𝕒) #HAtom
42 @(s2 … HAtom … ◊) // /2 width=2/
43 | #I #L1 #K1 #V1 #B #i #HLK1 #_ #IHB #L0 #des #HL01 #X #H #L2 #HL20
44 lapply (aacr_acr … H1RP H2RP B) #HB
45 elim (lifts_inv_lref1 … H) -H #i1 #Hi1 #H destruct
46 lapply (ldrop_fwd_ldrop2 … HLK1) #HK1b
47 elim (ldrops_ldrop_trans … HL01 … HLK1) #X #des1 #i0 #HL0 #H #Hi0 #Hdes1
48 >(at_mono … Hi1 … Hi0) -i1
49 elim (ldrops_inv_skip2 … Hdes1 … H) -des1 #K0 #V0 #des0 #Hdes0 #HK01 #HV10 #H destruct
50 elim (lsubc_ldrop_trans … HL20 … HL0) -HL0 #X #HLK2 #H
51 elim (lift_total V0 0 (i0 +1)) #V #HV0
52 elim (lsubc_inv_pair2 … H) -H *
53 [ #K2 #HK20 #H destruct
54 generalize in match HLK2; generalize in match I; -HLK2 -I * #HLK2
55 [ @(s4 … HB … ◊ … HV0 HLK2)
56 @(IHB … HL20) [2: /2 width=6/ | skip ]
59 (⇧*[des0]V1≡V0) → (⇧[O,i0+1]V0≡V) → (@[i]des≡i0) → (des+1▭i+1≡des0+1) →
62 Theorem lift1_free: (hds:?; i:?; t:?)
63 (lift1 hds (lift (S i) (0) t)) =
64 (lift (S (trans hds i)) (0) (lift1 (ptrans hds i) t)).
69 | @(s2 … HB … ◊) // /2 width=3/
71 | #K2 #V2 #A2 #HV2 #HV0 #HK20 #H1 #H2 destruct
73 | #L #V #T #B #A #_ #_ #IHB #IHA #L0 #des #HL0 #X #H #L2 #HL20
74 elim (lifts_inv_bind1 … H) -H #V0 #T0 #HV0 #HT0 #H destruct
75 lapply (aacr_acr … H1RP H2RP A) #HA
76 lapply (aacr_acr … H1RP H2RP B) #HB
77 lapply (s1 … HB) -HB #HB
78 @(s5 … HA … ◊ ◊) // /3 width=5/
79 | #L #W #T #B #A #_ #_ #IHB #IHA #L0 #des #HL0 #X #H #L2 #HL02
80 elim (lifts_inv_bind1 … H) -H #W0 #T0 #HW0 #HT0 #H destruct
81 @(aacr_abst … H1RP H2RP)
82 [ lapply (aacr_acr … H1RP H2RP B) #HB
83 @(s1 … HB) /2 width=5/
84 | #L3 #V3 #T3 #des3 #HL32 #HT03 #HB
85 elim (lifts_total des3 W0) #W2 #HW02
86 elim (ldrops_lsubc_trans … HL32 … HL02) -L2 #L2 #HL32 #HL20
87 @(IHA (L2. 𝕓{Abst} W2) … (des + 1 @ des3 + 1))
88 /2 width=3/ /3 width=5/ /4 width=6/
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/
100 lemma acp_aaa: ∀RR,RS,RP. acp RR RS RP → acr RR RS RP (λL,T. RP L T) →
101 ∀L,T,A. L ⊢ T ÷ A → RP L T.
102 #RR #RS #RP #H1RP #H2RP #L #T #A #HT
103 lapply (aacr_acr … H1RP H2RP A) #HA
104 @(s1 … HA) /2 width=8/