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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/relocation/lift_vector.ma".
17 include "basic_2/computation/cpxs_tstc.ma".
19 (* CONTEXT-SENSITIVE EXTENDED PARALLEL COMPUTATION ON TERMS *****************)
21 (* Vector form of forward lemmas involving same top term constructor ********)
23 (* Basic_1: was just: nf2_iso_appls_lref *)
24 lemma cpxs_fwd_cnx_vector: ∀h,g,L,T. 𝐒⦃T⦄ → ⦃h, L⦄ ⊢ 𝐍[g]⦃T⦄ →
25 ∀Vs,U. ⦃h, L⦄ ⊢ ⒶVs.T ➡*[g] U → ⒶVs.T ≃ U.
26 #h #g #L #T #H1T #H2T #Vs elim Vs -Vs [ @(cpxs_fwd_cnx … H2T) ] (**) (* /2 width=3 by cpxs_fwd_cnx/ does not work *)
28 elim (cpxs_inv_appl1 … H) -H *
29 [ -IHVs #V0 #T0 #_ #_ #H destruct /2 width=1/
30 | #a #V0 #W0 #T0 #HV0 #HT0 #HU
31 lapply (IHVs … HT0) -IHVs -HT0 #HT0
32 elim (tstc_inv_bind_appls_simple … HT0) //
33 | #a #V1 #V2 #V0 #T0 #HV1 #HV12 #HT0 #HU
34 lapply (IHVs … HT0) -IHVs -HT0 #HT0
35 elim (tstc_inv_bind_appls_simple … HT0) //
39 (* Basic_1: was just: pr3_iso_appls_beta *)
40 lemma cpxs_fwd_beta_vector: ∀h,g,a,L,Vs,V,W,T,U. ⦃h, L⦄ ⊢ ⒶVs.ⓐV.ⓛ{a}W.T ➡*[g] U →
41 ⒶVs. ⓐV. ⓛ{a}W. T ≃ U ∨
42 ∃∃T0.⦃h, L.ⓛW⦄ ⊢ T ➡*[g] T0 & ⦃h, L⦄ ⊢ ⒶVs.ⓓ{a}V.T0 ➡*[g] U.
43 #h #g #a #L #Vs elim Vs -Vs /2 width=1 by cpxs_fwd_beta/
44 #V0 #Vs #IHVs #V #W #T #U #H
45 elim (cpxs_inv_appl1 … H) -H *
46 [ -IHVs #V1 #T1 #_ #_ #H destruct /2 width=1/
47 | #b #V1 #W1 #T1 #HV01 #HT1 #HU
48 elim (IHVs … HT1) -IHVs -HT1
49 [ #HT1 elim (tstc_inv_bind_appls_simple … HT1) //
51 @or_intror @(ex2_intro … HT0) -W (**) (* explicit constructor *)
53 @(cpxs_strap1 … (ⓐV1.ⓛ{b}W1.T1)) [ /2 width=1/ ] -V -V0 -Vs -T /3 width=1/
55 | #b #V1 #V2 #V3 #T1 #HV01 #HV12 #HT1 #HU
56 elim (IHVs … HT1) -IHVs -HT1
57 [ #HT1 elim (tstc_inv_bind_appls_simple … HT1) //
59 @or_intror @(ex2_intro … HT0) -W (**) (* explicit constructor *)
61 @(cpxs_strap1 … (ⓐV1.ⓓ{b}V3.T1)) [ /2 width=1/ ] -V -V0 -Vs -T /3 width=3/
66 lemma cpxs_fwd_delta_vector: ∀h,g,I,L,K,V1,i. ⇩[0, i] L ≡ K.ⓑ{I}V1 →
67 ∀V2. ⇧[0, i + 1] V1 ≡ V2 →
68 ∀Vs,U. ⦃h, L⦄ ⊢ ⒶVs.#i ➡*[g] U →
69 ⒶVs.#i ≃ U ∨ ⦃h, L⦄ ⊢ ⒶVs.V2 ➡*[g] U.
70 #h #g #I #L #K #V1 #i #HLK #V2 #HV12 #Vs elim Vs -Vs /2 width=5 by cpxs_fwd_delta/
71 #V #Vs #IHVs #U #H -K -V1
72 elim (cpxs_inv_appl1 … H) -H *
73 [ -IHVs #V0 #T0 #_ #_ #H destruct /2 width=1/
74 | #b #V0 #W0 #T0 #HV0 #HT0 #HU
75 elim (IHVs … HT0) -IHVs -HT0 #HT0
76 [ elim (tstc_inv_bind_appls_simple … HT0) //
77 | @or_intror -i (**) (* explicit constructor *)
79 @(cpxs_strap1 … (ⓐV0.ⓛ{b}W0.T0)) [ /2 width=1/ ] -V -V2 -Vs /3 width=1/
81 | #b #V0 #V1 #V3 #T0 #HV0 #HV01 #HT0 #HU
82 elim (IHVs … HT0) -IHVs -HT0 #HT0
83 [ elim (tstc_inv_bind_appls_simple … HT0) //
84 | @or_intror -i (**) (* explicit constructor *)
86 @(cpxs_strap1 … (ⓐV0.ⓓ{b}V3.T0)) [ /2 width=1/ ] -V -V2 -Vs /3 width=3/
91 (* Basic_1: was just: pr3_iso_appls_abbr *)
92 lemma cpxs_fwd_theta_vector: ∀h,g,L,V1s,V2s. ⇧[0, 1] V1s ≡ V2s →
93 ∀a,V,T,U. ⦃h, L⦄ ⊢ ⒶV1s.ⓓ{a}V.T ➡*[g] U →
94 ⒶV1s. ⓓ{a}V. T ≃ U ∨ ⦃h, L⦄ ⊢ ⓓ{a}V.ⒶV2s.T ➡*[g] U.
95 #h #g #L #V1s #V2s * -V1s -V2s /3 width=1/
96 #V1s #V2s #V1a #V2a #HV12a #HV12s #a
97 generalize in match HV12a; -HV12a
98 generalize in match V2a; -V2a
99 generalize in match V1a; -V1a
100 elim HV12s -V1s -V2s /2 width=1 by cpxs_fwd_theta/
101 #V1s #V2s #V1b #V2b #HV12b #_ #IHV12s #V1a #V2a #HV12a #V #T #U #H
102 elim (cpxs_inv_appl1 … H) -H *
103 [ -IHV12s -HV12a -HV12b #V0 #T0 #_ #_ #H destruct /2 width=1/
104 | #b #V0a #W0 #T0 #HV10a #HT0 #HU
105 elim (IHV12s … HV12b … HT0) -IHV12s -HT0 #HT0
106 [ -HV12a -HV12b -HV10a -HU
107 elim (tstc_inv_pair1 … HT0) #V1 #T1 #H destruct
108 | @or_intror -V1s (**) (* explicit constructor *)
109 @(cpxs_trans … HU) -U
110 elim (cpxs_inv_abbr1 … HT0) -HT0 *
111 [ -HV12a -HV12b -HV10a #V1 #T1 #_ #_ #H destruct
112 | -V1b #X #HT1 #H #H0 destruct
113 elim (lift_inv_bind1 … H) -H #W1 #T1 #HW01 #HT01 #H destruct
114 @(cpxs_trans … (+ⓓV.ⓐV2a.ⓛ{b}W1.T1)) [ /3 width=1/ ] -T -V2b -V2s
115 @(cpxs_strap2 … (ⓐV1a.ⓛ{b}W0.T0)) [ /5 width=7/ ] -V -V2a -W1 -T1
116 @(cpxs_strap2 … (ⓓ{b}V1a.T0)) [ /3 width=1/ ] -W0 /2 width=1/
119 | #b #V0a #Va #V0 #T0 #HV10a #HV0a #HT0 #HU
120 elim (IHV12s … HV12b … HT0) -HV12b -IHV12s -HT0 #HT0
121 [ -HV12a -HV10a -HV0a -HU
122 elim (tstc_inv_pair1 … HT0) #V1 #T1 #H destruct
123 | @or_intror -V1s -V1b (**) (* explicit constructor *)
124 @(cpxs_trans … HU) -U
125 elim (cpxs_inv_abbr1 … HT0) -HT0 *
126 [ #V1 #T1 #HV1 #HT1 #H destruct
127 lapply (cpxs_lift … HV10a (L.ⓓV) … HV12a … HV0a) -V1a -V0a [ /2 width=1/ ] #HV2a
128 @(cpxs_trans … (ⓓ{a}V.ⓐV2a.T1)) [ /3 width=1/ ] -T -V2b -V2s /3 width=1/
129 | #X #HT1 #H #H0 destruct
130 elim (lift_inv_bind1 … H) -H #V1 #T1 #HW01 #HT01 #H destruct
131 lapply (cpxs_lift … HV10a (L.ⓓV0) … HV12a … HV0a) -V0a [ /2 width=1/ ] #HV2a
132 @(cpxs_trans … (+ⓓV.ⓐV2a.ⓓ{b}V1.T1)) [ /3 width=1/ ] -T -V2b -V2s
133 @(cpxs_strap2 … (ⓐV1a.ⓓ{b}V0.T0)) [ /5 width=7/ ] -V -V1 -T1
134 @(cpxs_strap2 … (ⓓ{b}V0.ⓐV2a.T0)) [ /3 width=3/ ] -V1a /3 width=1/
140 (* Basic_1: was just: pr3_iso_appls_cast *)
141 lemma cpxs_fwd_tau_vector: ∀h,g,L,Vs,W,T,U. ⦃h, L⦄ ⊢ ⒶVs.ⓝW.T ➡*[g] U →
142 ⒶVs. ⓝW. T ≃ U ∨ ⦃h, L⦄ ⊢ ⒶVs.T ➡*[g] U.
143 #h #g #L #Vs elim Vs -Vs /2 width=1 by cpxs_fwd_tau/
144 #V #Vs #IHVs #W #T #U #H
145 elim (cpxs_inv_appl1 … H) -H *
146 [ -IHVs #V0 #T0 #_ #_ #H destruct /2 width=1/
147 | #b #V0 #W0 #T0 #HV0 #HT0 #HU
148 elim (IHVs … HT0) -IHVs -HT0 #HT0
149 [ elim (tstc_inv_bind_appls_simple … HT0) //
150 | @or_intror -W (**) (* explicit constructor *)
151 @(cpxs_trans … HU) -U
152 @(cpxs_strap1 … (ⓐV0.ⓛ{b}W0.T0)) [ /2 width=1/ ] -V -Vs -T /3 width=1/
154 | #b #V0 #V1 #V2 #T0 #HV0 #HV01 #HT0 #HU
155 elim (IHVs … HT0) -IHVs -HT0 #HT0
156 [ elim (tstc_inv_bind_appls_simple … HT0) //
157 | @or_intror -W (**) (* explicit constructor *)
158 @(cpxs_trans … HU) -U
159 @(cpxs_strap1 … (ⓐV0.ⓓ{b}V2.T0)) [ /2 width=1/ ] -V -Vs -T /3 width=3/