X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frt_equivalence%2Fcpcs_cprs.ma;h=5292a2665d0b0fb607620bbddfa871bdf7585aab;hp=d9db0509f9349fefa27218fbd2945a7570bf923c;hb=c903bdd93123e6fc2ad63a951024da80c9c28307;hpb=cac0166656e08399eaaf1a1e19f0ccea28c36d39

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_equivalence/cpcs_cprs.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_equivalence/cpcs_cprs.ma
index d9db0509f..5292a2665 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_equivalence/cpcs_cprs.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_equivalence/cpcs_cprs.ma
@@ -12,51 +12,154 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "basic_2/computation/cprs.ma".
-include "basic_2/equivalence/cpcs.ma".
+include "basic_2/rt_computation/cprs_cprs.ma".
+include "basic_2/rt_computation/lprs_cpms.ma".
+include "basic_2/rt_equivalence/cpcs.ma".
 
-(* CONTEXT-SENSITIVE PARALLEL EQUIVALENCE ON TERMS **************************)
+(* CONTEXT-SENSITIVE PARALLEL R-EQUIVALENCE FOR TERMS ***********************)
 
-(* Properties about context sensitive computation on terms ******************)
+(* Inversion lemmas with context sensitive r-computation on terms ***********)
+
+lemma cpcs_inv_cprs (h) (G) (L): ∀T1,T2. ⦃G, L⦄ ⊢ T1 ⬌*[h] T2 →
+                                 ∃∃T. ⦃G, L⦄ ⊢ T1 ➡*[h] T & ⦃G, L⦄ ⊢ T2 ➡*[h] T.
+#h #G #L #T1 #T2 #H @(cpcs_ind_dx … H) -T2
+[ /3 width=3 by ex2_intro/
+| #T #T2 #_ #HT2 * #T0 #HT10 elim HT2 -HT2 #HT2 #HT0
+  [ elim (cprs_strip … HT0 … HT2) -T /3 width=3 by cprs_step_dx, ex2_intro/
+  | /3 width=5 by cprs_step_sn, ex2_intro/
+  ]
+]
+qed-.
+
+(* Advanced inversion lemmas ************************************************)
+
+(* Basic_1: was: pc3_gen_sort *)
+(* Basic_2A1: was: cpcs_inv_sort *)
+lemma cpcs_inv_sort_bi (h) (G) (L): ∀s1,s2. ⦃G, L⦄ ⊢ ⋆s1 ⬌*[h] ⋆s2 → s1 = s2.
+#h #G #L #s1 #s2 #H elim (cpcs_inv_cprs … H) -H
+#T #H1 >(cprs_inv_sort1 … H1) -T #H2
+lapply (cprs_inv_sort1 … H2) -L #H destruct //
+qed-.
+
+(* Basic_2A1: was: cpcs_inv_abst1 *)
+lemma cpcs_inv_abst_sn (h) (G) (L):
+                       ∀p,W1,T1,X. ⦃G, L⦄ ⊢ ⓛ{p}W1.T1 ⬌*[h] X →
+                       ∃∃W2,T2. ⦃G, L⦄ ⊢ X ➡*[h] ⓛ{p}W2.T2 & ⦃G, L⦄ ⊢ ⓛ{p}W1.T1 ➡*[h] ⓛ{p}W2.T2.
+#h #G #L #p #W1 #T1 #T #H
+elim (cpcs_inv_cprs … H) -H #X #H1 #H2
+elim (cpms_inv_abst_sn … H1) -H1 #W2 #T2 #HW12 #HT12 #H destruct
+/3 width=6 by cpms_bind, ex2_2_intro/
+qed-.
+
+(* Basic_2A1: was: cpcs_inv_abst2 *)
+lemma cpcs_inv_abst_dx (h) (G) (L):
+                       ∀p,W1,T1,X. ⦃G, L⦄ ⊢ X ⬌*[h] ⓛ{p}W1.T1 →
+                       ∃∃W2,T2. ⦃G, L⦄ ⊢ X ➡*[h] ⓛ{p}W2.T2 & ⦃G, L⦄ ⊢ ⓛ{p}W1.T1 ➡*[h] ⓛ{p}W2.T2.
+/3 width=1 by cpcs_inv_abst_sn, cpcs_sym/ qed-.
+
+(* Basic_1: was: pc3_gen_sort_abst *)
+lemma cpcs_inv_sort_abst (h) (G) (L):
+                         ∀p,W,T,s. ⦃G, L⦄ ⊢ ⋆s ⬌*[h] ⓛ{p}W.T → ⊥.
+#h #G #L #p #W #T #s #H
+elim (cpcs_inv_cprs … H) -H #X #H1
+>(cprs_inv_sort1 … H1) -X #H2
+elim (cpms_inv_abst_sn … H2) -H2 #W0 #T0 #_ #_ #H destruct
+qed-.
+
+(* Properties with context sensitive r-computation on terms *****************)
 
 (* Basic_1: was: pc3_pr3_r *)
-lemma cpcs_cprs_dx: ∀G,L,T1,T2. ⦃G, L⦄ ⊢ T1 ➡* T2 → ⦃G, L⦄ ⊢ T1 ⬌* T2.
-#G #L #T1 #T2 #H @(cprs_ind … H) -T2
-/3 width=3 by cpcs_cpr_strap1, cpcs_strap1, cpc_cpcs/
+lemma cpcs_cprs_dx (h) (G) (L): ∀T1,T2. ⦃G, L⦄ ⊢ T1 ➡*[h] T2 → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+#h #G #L #T1 #T2 #H @(cprs_ind_dx … H) -T2
+/3 width=3 by cpcs_cpr_step_dx, cpcs_step_dx, cpc_cpcs/
 qed.
 
 (* Basic_1: was: pc3_pr3_x *)
-lemma cpcs_cprs_sn: ∀G,L,T1,T2. ⦃G, L⦄ ⊢ T2 ➡* T1 → ⦃G, L⦄ ⊢ T1 ⬌* T2.
-#G #L #T1 #T2 #H @(cprs_ind_dx … H) -T2
-/3 width=3 by cpcs_cpr_div, cpcs_strap1, cpcs_cprs_dx/
+lemma cpcs_cprs_sn (h) (G) (L): ∀T1,T2. ⦃G, L⦄ ⊢ T2 ➡*[h] T1 → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+#h #G #L #T1 #T2 #H @(cprs_ind_sn … H) -T2
+/3 width=3 by cpcs_cpr_div, cpcs_step_sn, cpcs_cprs_dx/
 qed.
 
-lemma cpcs_cprs_strap1: ∀G,L,T1,T. ⦃G, L⦄ ⊢ T1 ⬌* T → ∀T2. ⦃G, L⦄ ⊢ T ➡* T2 → ⦃G, L⦄ ⊢ T1 ⬌* T2.
-#G #L #T1 #T #HT1 #T2 #H @(cprs_ind … H) -T2 /2 width=3 by cpcs_cpr_strap1/
+(* Basic_2A1: was: cpcs_cprs_strap1 *)
+lemma cpcs_cprs_step_dx (h) (G) (L): ∀T1,T. ⦃G, L⦄ ⊢ T1 ⬌*[h] T →
+                                     ∀T2. ⦃G, L⦄ ⊢ T ➡*[h] T2 → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+#h #G #L #T1 #T #HT1 #T2 #H @(cprs_ind_dx … H) -T2 /2 width=3 by cpcs_cpr_step_dx/
 qed-.
 
-lemma cpcs_cprs_strap2: ∀G,L,T1,T. ⦃G, L⦄ ⊢ T1 ➡* T → ∀T2. ⦃G, L⦄ ⊢ T ⬌* T2 → ⦃G, L⦄ ⊢ T1 ⬌* T2.
-#G #L #T1 #T #H #T2 #HT2 @(cprs_ind_dx … H) -T1 /2 width=3 by cpcs_cpr_strap2/
+(* Basic_2A1: was: cpcs_cprs_strap2 *)
+lemma cpcs_cprs_step_sn (h) (G) (L): ∀T1,T. ⦃G, L⦄ ⊢ T1 ➡*[h] T →
+                                     ∀T2. ⦃G, L⦄ ⊢ T ⬌*[h] T2 → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+#h #G #L #T1 #T #H #T2 #HT2 @(cprs_ind_sn … H) -T1 /2 width=3 by cpcs_cpr_step_sn/
 qed-.
 
-lemma cpcs_cprs_div: ∀G,L,T1,T. ⦃G, L⦄ ⊢ T1 ⬌* T → ∀T2. ⦃G, L⦄ ⊢ T2 ➡* T → ⦃G, L⦄ ⊢ T1 ⬌* T2.
-#G #L #T1 #T #HT1 #T2 #H @(cprs_ind_dx … H) -T2 /2 width=3 by cpcs_cpr_div/
+lemma cpcs_cprs_div (h) (G) (L): ∀T1,T. ⦃G, L⦄ ⊢ T1 ⬌*[h] T →
+                                 ∀T2. ⦃G, L⦄ ⊢ T2 ➡*[h] T → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+#h #G #L #T1 #T #HT1 #T2 #H @(cprs_ind_sn … H) -T2 /2 width=3 by cpcs_cpr_div/
 qed-.
 
 (* Basic_1: was: pc3_pr3_conf *)
-lemma cpcs_cprs_conf: ∀G,L,T1,T. ⦃G, L⦄ ⊢ T ➡* T1 → ∀T2. ⦃G, L⦄ ⊢ T ⬌* T2 → ⦃G, L⦄ ⊢ T1 ⬌* T2.
-#G #L #T1 #T #H #T2 #HT2 @(cprs_ind … H) -T1 /2 width=3 by cpcs_cpr_conf/
+lemma cpcs_cprs_conf (h) (G) (L): ∀T1,T. ⦃G, L⦄ ⊢ T ➡*[h] T1 →
+                                  ∀T2. ⦃G, L⦄ ⊢ T ⬌*[h] T2 → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+#h #G #L #T1 #T #H #T2 #HT2 @(cprs_ind_dx … H) -T1 /2 width=3 by cpcs_cpr_conf/
 qed-.
 
 (* Basic_1: was: pc3_pr3_t *)
 (* Basic_1: note: pc3_pr3_t should be renamed *)
-lemma cprs_div: ∀G,L,T1,T. ⦃G, L⦄ ⊢ T1 ➡* T → ∀T2. ⦃G, L⦄ ⊢ T2 ➡* T → ⦃G, L⦄ ⊢ T1 ⬌* T2.
-#G #L #T1 #T #HT1 #T2 #H @(cprs_ind_dx … H) -T2
+lemma cprs_div (h) (G) (L): ∀T1,T. ⦃G, L⦄ ⊢ T1 ➡*[h] T →
+                            ∀T2. ⦃G, L⦄ ⊢ T2 ➡*[h] T → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+#h #G #L #T1 #T #HT1 #T2 #H @(cprs_ind_sn … H) -T2
 /2 width=3 by cpcs_cpr_div, cpcs_cprs_dx/
 qed.
 
-lemma cprs_cpr_div: ∀G,L,T1,T. ⦃G, L⦄ ⊢ T1 ➡* T → ∀T2. ⦃G, L⦄ ⊢ T2 ➡ T → ⦃G, L⦄ ⊢ T1 ⬌* T2.
-/3 width=5 by cpr_cprs, cprs_div/ qed-.
+lemma cprs_cpr_div (h) (G) (L): ∀T1,T. ⦃G, L⦄ ⊢ T1 ➡*[h] T →
+                                ∀T2. ⦃G, L⦄ ⊢ T2 ➡[h] T → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+/3 width=5 by cpm_cpms, cprs_div/ qed-.
+
+lemma cpr_cprs_div (h) (G) (L): ∀T1,T. ⦃G, L⦄ ⊢ T1 ➡[h] T →
+                                ∀T2. ⦃G, L⦄ ⊢ T2 ➡*[h] T → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+/3 width=3 by cpm_cpms, cprs_div/ qed-.
+
+lemma cpr_cprs_conf_cpcs (h) (G) (L): ∀T,T1. ⦃G, L⦄ ⊢ T ➡*[h] T1 →
+                                      ∀T2. ⦃G, L⦄ ⊢ T ➡[h] T2 → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+#h #G #L #T #T1 #HT1 #T2 #HT2 elim (cprs_strip … HT1 … HT2) -HT1 -HT2
+/2 width=3 by cpr_cprs_div/
+qed-.
+
+lemma cprs_cpr_conf_cpcs (h) (G) (L): ∀T,T1. ⦃G, L⦄ ⊢ T ➡*[h] T1 →
+                                      ∀T2. ⦃G, L⦄ ⊢ T ➡[h] T2 → ⦃G, L⦄ ⊢ T2 ⬌*[h] T1.
+#h #G #L #T #T1 #HT1 #T2 #HT2 elim (cprs_strip … HT1 … HT2) -HT1 -HT2
+/2 width=3 by cprs_cpr_div/
+qed-.
+
+lemma cprs_conf_cpcs (h) (G) (L): ∀T,T1. ⦃G, L⦄ ⊢ T ➡*[h] T1 →
+                                  ∀T2. ⦃G, L⦄ ⊢ T ➡*[h] T2 → ⦃G, L⦄ ⊢ T1 ⬌*[h] T2.
+#h #G #L #T #T1 #HT1 #T2 #HT2 elim (cprs_conf … HT1 … HT2) -HT1 -HT2
+/2 width=3 by cprs_div/
+qed-.
+
+(* Basic_1: was only: pc3_thin_dx *)
+lemma cpcs_flat (h) (G) (L): ∀V1,V2. ⦃G, L⦄ ⊢ V1 ⬌*[h] V2 →
+                             ∀T1,T2. ⦃G, L⦄ ⊢ T1 ⬌*[h] T2 →
+                             ∀I. ⦃G, L⦄ ⊢ ⓕ{I}V1.T1 ⬌*[h] ⓕ{I}V2.T2.
+#h #G #L #V1 #V2 #HV12 #T1 #T2 #HT12
+elim (cpcs_inv_cprs … HV12) -HV12
+elim (cpcs_inv_cprs … HT12) -HT12
+/3 width=5 by cprs_flat, cprs_div/
+qed.
+
+lemma cpcs_flat_dx_cpr_rev (h) (G) (L): ∀V1,V2. ⦃G, L⦄ ⊢ V2 ➡[h] V1 →
+                                        ∀T1,T2. ⦃G, L⦄ ⊢ T1 ⬌*[h] T2 →
+                                        ∀I. ⦃G, L⦄ ⊢ ⓕ{I}V1.T1 ⬌*[h] ⓕ{I}V2.T2.
+/3 width=1 by cpr_cpcs_sn, cpcs_flat/ qed.
 
-lemma cpr_cprs_div: ∀G,L,T1,T. ⦃G, L⦄ ⊢ T1 ➡ T → ∀T2. ⦃G, L⦄ ⊢ T2 ➡* T → ⦃G, L⦄ ⊢ T1 ⬌* T2.
-/3 width=3 by cpr_cprs, cprs_div/ qed-.
+lemma cpcs_bind_dx (h) (G) (L): ∀I,V,T1,T2. ⦃G, L.ⓑ{I}V⦄ ⊢ T1 ⬌*[h] T2 →
+                                ∀p. ⦃G, L⦄ ⊢ ⓑ{p,I}V.T1 ⬌*[h] ⓑ{p,I}V.T2.
+#h #G #L #I #V #T1 #T2 #HT12 elim (cpcs_inv_cprs … HT12) -HT12
+/3 width=5 by cprs_div, cpms_bind/
+qed.
+
+lemma cpcs_bind_sn (h) (G) (L): ∀I,V1,V2,T. ⦃G, L⦄ ⊢ V1 ⬌*[h] V2 →
+                                ∀p. ⦃G, L⦄ ⊢ ⓑ{p,I}V1.T ⬌*[h] ⓑ{p,I}V2.T.
+#h #G #L #I #V1 #V2 #T #HV12 elim (cpcs_inv_cprs … HV12) -HV12
+/3 width=5 by cprs_div, cpms_bind/
+qed.