matita/matita/contribs/lambdadelta/basic_2A/computation/cprs.ma

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  14
  15 include "basic_2A/notation/relations/predstar_4.ma".
  16 include "basic_2A/reduction/cnr.ma".
  17
  18 (* CONTEXT-SENSITIVE PARALLEL COMPUTATION ON TERMS **************************)
  19
  20 (* Basic_1: includes: pr1_pr0 *)
  21 definition cprs: relation4 genv lenv term term ≝
  22                  λG. LTC … (cpr G).
  23
  24 interpretation "context-sensitive parallel computation (term)"
  25    'PRedStar G L T1 T2 = (cprs G L T1 T2).
  26
  27 (* Basic eliminators ********************************************************)
  28
  29 lemma cprs_ind: ∀G,L,T1. ∀R:predicate term. R T1 →
  30                 (∀T,T2. ⦃G, L⦄ ⊢ T1 ➡* T → ⦃G, L⦄ ⊢ T ➡ T2 → R T → R T2) →
  31                 ∀T2. ⦃G, L⦄ ⊢ T1 ➡* T2 → R T2.
  32 #G #L #T1 #R #HT1 #IHT1 #T2 #HT12
  33 @(TC_star_ind … HT1 IHT1 … HT12) //
  34 qed-.
  35
  36 lemma cprs_ind_dx: ∀G,L,T2. ∀R:predicate term. R T2 →
  37                    (∀T1,T. ⦃G, L⦄ ⊢ T1 ➡ T → ⦃G, L⦄ ⊢ T ➡* T2 → R T → R T1) →
  38                    ∀T1. ⦃G, L⦄ ⊢ T1 ➡* T2 → R T1.
  39 #G #L #T2 #R #HT2 #IHT2 #T1 #HT12
  40 @(TC_star_ind_dx … HT2 IHT2 … HT12) //
  41 qed-.
  42
  43 (* Basic properties *********************************************************)
  44
  45 (* Basic_1: was: pr3_pr2 *)
  46 lemma cpr_cprs: ∀G,L,T1,T2. ⦃G, L⦄ ⊢ T1 ➡ T2 → ⦃G, L⦄ ⊢ T1 ➡* T2.
  47 /2 width=1 by inj/ qed.
  48
  49 (* Basic_1: was: pr3_refl *)
  50 lemma cprs_refl: ∀G,L,T. ⦃G, L⦄ ⊢ T ➡* T.
  51 /2 width=1 by cpr_cprs/ qed.
  52
  53 lemma cprs_strap1: ∀G,L,T1,T,T2.
  54                    ⦃G, L⦄ ⊢ T1 ➡* T → ⦃G, L⦄ ⊢ T ➡ T2 → ⦃G, L⦄ ⊢ T1 ➡* T2.
  55 normalize /2 width=3 by step/ qed-.
  56
  57 (* Basic_1: was: pr3_step *)
  58 lemma cprs_strap2: ∀G,L,T1,T,T2.
  59                    ⦃G, L⦄ ⊢ T1 ➡ T → ⦃G, L⦄ ⊢ T ➡* T2 → ⦃G, L⦄ ⊢ T1 ➡* T2.
  60 normalize /2 width=3 by TC_strap/ qed-.
  61
  62 lemma lsubr_cprs_trans: ∀G. lsub_trans … (cprs G) lsubr.
  63 /3 width=5 by lsubr_cpr_trans, LTC_lsub_trans/
  64 qed-.
  65
  66 (* Basic_1: was: pr3_pr1 *)
  67 lemma tprs_cprs: ∀G,L,T1,T2. ⦃G, ⋆⦄ ⊢ T1 ➡* T2 → ⦃G, L⦄ ⊢ T1 ➡* T2.
  68 /2 width=3 by lsubr_cprs_trans/ qed.
  69
  70 lemma cprs_bind_dx: ∀G,L,V1,V2. ⦃G, L⦄ ⊢ V1 ➡ V2 → ∀I,T1,T2. ⦃G, L.ⓑ{I}V1⦄ ⊢ T1 ➡* T2 →
  71                     ∀a. ⦃G, L⦄ ⊢ ⓑ{a,I}V1. T1 ➡* ⓑ{a,I}V2. T2.
  72 #G #L #V1 #V2 #HV12 #I #T1 #T2 #HT12 #a @(cprs_ind_dx … HT12) -T1
  73 /3 width=3 by cprs_strap2, cpr_cprs, cpr_pair_sn, cpr_bind/ qed.
  74
  75 (* Basic_1: was only: pr3_thin_dx *)
  76 lemma cprs_flat_dx: ∀I,G,L,V1,V2. ⦃G, L⦄ ⊢ V1 ➡ V2 → ∀T1,T2. ⦃G, L⦄ ⊢ T1 ➡* T2 →
  77                     ⦃G, L⦄ ⊢ ⓕ{I} V1. T1 ➡* ⓕ{I} V2. T2.
  78 #I #G #L #V1 #V2 #HV12 #T1 #T2 #HT12 @(cprs_ind … HT12) -T2
  79 /3 width=5 by cprs_strap1, cpr_flat, cpr_cprs, cpr_pair_sn/
  80 qed.
  81
  82 lemma cprs_flat_sn: ∀I,G,L,T1,T2. ⦃G, L⦄ ⊢ T1 ➡ T2 → ∀V1,V2. ⦃G, L⦄ ⊢ V1 ➡* V2 →
  83                     ⦃G, L⦄ ⊢ ⓕ{I} V1. T1 ➡* ⓕ{I} V2. T2.
  84 #I #G #L #T1 #T2 #HT12 #V1 #V2 #H @(cprs_ind … H) -V2
  85 /3 width=3 by cprs_strap1, cpr_cprs, cpr_pair_sn, cpr_flat/
  86 qed.
  87
  88 lemma cprs_zeta: ∀G,L,V,T1,T,T2. ⬆[0, 1] T2 ≡ T →
  89                  ⦃G, L.ⓓV⦄ ⊢ T1 ➡* T → ⦃G, L⦄ ⊢ +ⓓV.T1 ➡* T2.
  90 #G #L #V #T1 #T #T2 #HT2 #H @(cprs_ind_dx … H) -T1
  91 /3 width=3 by cprs_strap2, cpr_cprs, cpr_bind, cpr_zeta/
  92 qed.
  93
  94 lemma cprs_eps: ∀G,L,T1,T2. ⦃G, L⦄ ⊢ T1 ➡* T2 → ∀V. ⦃G, L⦄ ⊢ ⓝV.T1 ➡* T2.
  95 #G #L #T1 #T2 #H @(cprs_ind … H) -T2
  96 /3 width=3 by cprs_strap1, cpr_cprs, cpr_eps/
  97 qed.
  98
  99 lemma cprs_beta_dx: ∀a,G,L,V1,V2,W1,W2,T1,T2.
 100                     ⦃G, L⦄ ⊢ V1 ➡ V2 → ⦃G, L⦄ ⊢ W1 ➡ W2 → ⦃G, L.ⓛW1⦄ ⊢ T1 ➡* T2 →
 101                     ⦃G, L⦄ ⊢ ⓐV1.ⓛ{a}W1.T1 ➡* ⓓ{a}ⓝW2.V2.T2.
 102 #a #G #L #V1 #V2 #W1 #W2 #T1 #T2 #HV12 #HW12 * -T2
 103 /4 width=7 by cprs_strap1, cpr_cprs, cprs_bind_dx, cprs_flat_dx, cpr_beta/
 104 qed.
 105
 106 lemma cprs_theta_dx: ∀a,G,L,V1,V,V2,W1,W2,T1,T2.
 107                      ⦃G, L⦄ ⊢ V1 ➡ V → ⬆[0, 1] V ≡ V2 → ⦃G, L.ⓓW1⦄ ⊢ T1 ➡* T2 →
 108                      ⦃G, L⦄ ⊢ W1 ➡ W2 → ⦃G, L⦄ ⊢ ⓐV1.ⓓ{a}W1.T1 ➡* ⓓ{a}W2.ⓐV2.T2.
 109 #a #G #L #V1 #V #V2 #W1 #W2 #T1 #T2 #HV1 #HV2 * -T2
 110 /4 width=9 by cprs_strap1, cpr_cprs, cprs_bind_dx, cprs_flat_dx, cpr_theta/
 111 qed.
 112
 113 (* Basic inversion lemmas ***************************************************)
 114
 115 (* Basic_1: was: pr3_gen_sort *)
 116 lemma cprs_inv_sort1: ∀G,L,U2,k. ⦃G, L⦄ ⊢ ⋆k ➡* U2 → U2 = ⋆k.
 117 #G #L #U2 #k #H @(cprs_ind … H) -U2 //
 118 #U2 #U #_ #HU2 #IHU2 destruct
 119 >(cpr_inv_sort1 … HU2) -HU2 //
 120 qed-.
 121
 122 (* Basic_1: was: pr3_gen_cast *)
 123 lemma cprs_inv_cast1: ∀G,L,W1,T1,U2. ⦃G, L⦄ ⊢ ⓝW1.T1 ➡* U2 → ⦃G, L⦄ ⊢ T1 ➡* U2 ∨
 124                       ∃∃W2,T2. ⦃G, L⦄ ⊢ W1 ➡* W2 & ⦃G, L⦄ ⊢ T1 ➡* T2 & U2 = ⓝW2.T2.
 125 #G #L #W1 #T1 #U2 #H @(cprs_ind … H) -U2 /3 width=5 by ex3_2_intro, or_intror/
 126 #U2 #U #_ #HU2 * /3 width=3 by cprs_strap1, or_introl/ *
 127 #W #T #HW1 #HT1 #H destruct
 128 elim (cpr_inv_cast1 … HU2) -HU2 /3 width=3 by cprs_strap1, or_introl/ *
 129 #W2 #T2 #HW2 #HT2 #H destruct /4 width=5 by cprs_strap1, ex3_2_intro, or_intror/
 130 qed-.
 131
 132 (* Basic_1: was: nf2_pr3_unfold *)
 133 lemma cprs_inv_cnr1: ∀G,L,T,U. ⦃G, L⦄ ⊢ T ➡* U → ⦃G, L⦄ ⊢ ➡ 𝐍⦃T⦄ → T = U.
 134 #G #L #T #U #H @(cprs_ind_dx … H) -T //
 135 #T0 #T #H1T0 #_ #IHT #H2T0
 136 lapply (H2T0 … H1T0) -H1T0 #H destruct /2 width=1 by/
 137 qed-.
 138
 139 (* Basic_1: removed theorems 13:
 140    pr1_head_1 pr1_head_2 pr1_comp
 141    clear_pr3_trans pr3_cflat pr3_gen_bind
 142    pr3_head_1 pr3_head_2 pr3_head_21 pr3_head_12
 143    pr3_iso_appl_bind pr3_iso_appls_appl_bind pr3_iso_appls_bind
 144 *)