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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/grammar/tstc_vector.ma".
16 include "basic_2/substitution/lift_vector.ma".
17 include "basic_2/computation/cprs_tstc.ma".
19 (* CONTEXT-SENSITIVE PARALLEL COMPUTATION ON TERMS **************************)
21 (* Vector form of forward lemmas involving same top term constructor ********)
23 lemma cprs_fwd_cnf_vector: ∀L,T. 𝐒[T] → L ⊢ 𝐍[T] → ∀Vs,U. L ⊢ ⒶVs.T ➡* U → ⒶVs.T ≃ U.
24 #L #T #H1T #H2T #Vs elim Vs -Vs [ @(cprs_fwd_cnf … H2T) ] (**) (* /2 width=3 by cprs_fwd_cnf/ does not work *)
26 elim (cprs_inv_appl1 … H) -H *
27 [ -IHVs #V0 #T0 #_ #_ #H destruct /2 width=1/
28 | #V0 #W0 #T0 #HV0 #HT0 #HU
29 lapply (IHVs … HT0) -IHVs -HT0 #HT0
30 elim (tstc_inv_bind_appls_simple … HT0 ?) //
31 | #V1 #V2 #V0 #T0 #HV1 #HV12 #HT0 #HU
32 lapply (IHVs … HT0) -IHVs -HT0 #HT0
33 elim (tstc_inv_bind_appls_simple … HT0 ?) //
37 (* Basic_1: was: pr3_iso_appls_beta *)
38 lemma cprs_fwd_beta_vector: ∀L,Vs,V,W,T,U. L ⊢ ⒶVs. ⓐV. ⓛW. T ➡* U →
39 ⒶVs. ⓐV. ⓛW. T ≃ U ∨ L ⊢ ⒶVs. ⓓV. T ➡* U.
40 #L #Vs elim Vs -Vs /2 width=1 by cprs_fwd_beta/
41 #V0 #Vs #IHVs #V #W #T #U #H
42 elim (cprs_inv_appl1 … H) -H *
43 [ -IHVs #V1 #T1 #_ #_ #H destruct /2 width=1/
44 | #V1 #W1 #T1 #HV01 #HT1 #HU
45 elim (IHVs … HT1) -IHVs -HT1 #HT1
46 [ elim (tstc_inv_bind_appls_simple … HT1 ?) //
47 | @or_intror -W (**) (* explicit constructor *)
49 @(cprs_strap1 … (ⓐV1.ⓛW1.T1)) [ /2 width=1/ ] -V -V0 -Vs -T /3 width=1/
51 | #V1 #V2 #V3 #T1 #HV01 #HV12 #HT1 #HU
52 elim (IHVs … HT1) -IHVs -HT1 #HT1
53 [ elim (tstc_inv_bind_appls_simple … HT1 ?) //
54 | @or_intror -W (**) (* explicit constructor *)
56 @(cprs_strap1 … (ⓐV1.ⓓV3.T1)) [ /2 width=1/ ] -V -V0 -Vs -T /3 width=3/
61 lemma cprs_fwd_delta_vector: ∀L,K,V1,i. ⇩[0, i] L ≡ K. ⓓV1 →
62 ∀V2. ⇧[0, i + 1] V1 ≡ V2 →
63 ∀Vs,U. L ⊢ ⒶVs.#i ➡* U →
64 ⒶVs.#i ≃ U ∨ L ⊢ ⒶVs.V2 ➡* U.
65 #L #K #V1 #i #HLK #V2 #HV12 #Vs elim Vs -Vs /2 width=4 by cprs_fwd_delta/
66 #V #Vs #IHVs #U #H -K -V1
67 elim (cprs_inv_appl1 … H) -H *
68 [ -IHVs #V0 #T0 #_ #_ #H destruct /2 width=1/
69 | #V0 #W0 #T0 #HV0 #HT0 #HU
70 elim (IHVs … HT0) -IHVs -HT0 #HT0
71 [ elim (tstc_inv_bind_appls_simple … HT0 ?) //
72 | @or_intror -i (**) (* explicit constructor *)
74 @(cprs_strap1 … (ⓐV0.ⓛW0.T0)) [ /2 width=1/ ] -V -V2 -Vs /3 width=1/
76 | #V0 #V1 #V3 #T0 #HV0 #HV01 #HT0 #HU
77 elim (IHVs … HT0) -IHVs -HT0 #HT0
78 [ elim (tstc_inv_bind_appls_simple … HT0 ?) //
79 | @or_intror -i (**) (* explicit constructor *)
81 @(cprs_strap1 … (ⓐV0.ⓓV3.T0)) [ /2 width=1/ ] -V -V2 -Vs /3 width=3/
86 (* Basic_1: was: pr3_iso_appls_abbr *)
87 lemma cprs_fwd_theta_vector: ∀L,V1s,V2s. ⇧[0, 1] V1s ≡ V2s →
88 ∀V,T,U. L ⊢ ⒶV1s. ⓓV. T ➡* U →
89 ⒶV1s. ⓓV. T ≃ U ∨ L ⊢ ⓓV. ⒶV2s. T ➡* U.
90 #L #V1s #V2s * -V1s -V2s /3 width=1/
91 #V1s #V2s #V1a #V2a #HV12a #HV12s
92 generalize in match HV12a; -HV12a
93 generalize in match V2a; -V2a
94 generalize in match V1a; -V1a
95 elim HV12s -V1s -V2s /2 width=1 by cprs_fwd_theta/
96 #V1s #V2s #V1b #V2b #HV12b #_ #IHV12s #V1a #V2a #HV12a #V #T #U #H
97 elim (cprs_inv_appl1 … H) -H *
98 [ -IHV12s -HV12a -HV12b #V0 #T0 #_ #_ #H destruct /2 width=1/
99 | #V0a #W0 #T0 #HV10a #HT0 #HU
100 elim (IHV12s … HV12b … HT0) -IHV12s -HT0 #HT0
101 [ -HV12a -HV12b -HV10a -HU
102 elim (tstc_inv_pair1 … HT0) #V1 #T1 #H destruct
103 | @or_intror -V1s (**) (* explicit constructor *)
104 @(cprs_trans … HU) -U
105 elim (cprs_inv_abbr1 … HT0) -HT0 *
106 [ -HV12a -HV12b -HV10a #V1 #T1 #_ #_ #H destruct
108 elim (lift_inv_bind1 … H) -H #W1 #T1 #HW01 #HT01 #H destruct
109 @(cprs_trans … (ⓓV.ⓐV2a.ⓛW1.T1)) [ /3 width=1/ ] -T -V2b -V2s
110 @(cprs_strap2 … (ⓐV1a.ⓛW0.T0)) [ /5 width=3/ ] -V -V2a -W1 -T1
111 @(cprs_strap2 … (ⓓV1a.T0)) [ /3 width=1/ ] -W0 /2 width=1/
114 | #V0a #Va #V0 #T0 #HV10a #HV0a #HT0 #HU
115 elim (IHV12s … HV12b … HT0) -HV12b -IHV12s -HT0 #HT0
116 [ -HV12a -HV10a -HV0a -HU
117 elim (tstc_inv_pair1 … HT0) #V1 #T1 #H destruct
118 | @or_intror -V1s -V1b (**) (* explicit constructor *)
119 @(cprs_trans … HU) -U
120 elim (cprs_inv_abbr1 … HT0) -HT0 *
121 [ #V1 #T1 #HV1 #HT1 #H destruct
122 lapply (cprs_lift (L.ⓓV) … HV12a … HV10a … HV0a) -V1a -V0a [ /2 width=1/ ] #HV2a
123 @(cprs_trans … (ⓓV.ⓐV2a.T1)) [ /3 width=1/ ] -T -V2b -V2s /3 width=1/
125 elim (lift_inv_bind1 … H) -H #V1 #T1 #HW01 #HT01 #H destruct
126 lapply (cprs_lift (L.ⓓV0) … HV12a … HV10a … HV0a) -V0a [ /2 width=1/ ] #HV2a
127 @(cprs_trans … (ⓓV.ⓐV2a.ⓓV1.T1)) [ /3 width=1/ ] -T -V2b -V2s
128 @(cprs_strap2 … (ⓐV1a.ⓓV0.T0)) [ /5 width=3/ ] -V -V1 -T1
129 @(cprs_strap2 … (ⓓV0.ⓐV2a.T0)) [ /3 width=3/ ] -V1a /3 width=1/
135 (* Basic_1: was: pr3_iso_appls_cast *)
136 lemma cprs_fwd_tau_vector: ∀L,Vs,W,T,U. L ⊢ ⒶVs. ⓣW. T ➡* U →
137 ⒶVs. ⓣW. T ≃ U ∨ L ⊢ ⒶVs. T ➡* U.
138 #L #Vs elim Vs -Vs /2 width=1 by cprs_fwd_tau/
139 #V #Vs #IHVs #W #T #U #H
140 elim (cprs_inv_appl1 … H) -H *
141 [ -IHVs #V0 #T0 #_ #_ #H destruct /2 width=1/
142 | #V0 #W0 #T0 #HV0 #HT0 #HU
143 elim (IHVs … HT0) -IHVs -HT0 #HT0
144 [ elim (tstc_inv_bind_appls_simple … HT0 ?) //
145 | @or_intror -W (**) (* explicit constructor *)
146 @(cprs_trans … HU) -U
147 @(cprs_strap1 … (ⓐV0.ⓛW0.T0)) [ /2 width=1/ ] -V -Vs -T /3 width=1/
149 | #V0 #V1 #V2 #T0 #HV0 #HV01 #HT0 #HU
150 elim (IHVs … HT0) -IHVs -HT0 #HT0
151 [ elim (tstc_inv_bind_appls_simple … HT0 ?) //
152 | @or_intror -W (**) (* explicit constructor *)
153 @(cprs_trans … HU) -U
154 @(cprs_strap1 … (ⓐV0.ⓓV2.T0)) [ /2 width=1/ ] -V -Vs -T /3 width=3/