X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frt_computation%2Ffpbg_fpbs.ma;h=fcfcbc9784d7e1e5bce76d93866acfad0b48b9b8;hb=3c7b4071a9ac096b02334c1d47468776b948e2de;hp=2118c2c16b9ce59b7b296fccb0775d30525b9ee1;hpb=6167cca50de37eba76a062537b24f7caef5b34f2;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg_fpbs.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg_fpbs.ma
index 2118c2c16..fcfcbc978 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg_fpbs.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg_fpbs.ma
@@ -12,57 +12,97 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "basic_2/computation/lpxs_lleq.ma".
-include "basic_2/computation/fpbs_lift.ma".
-include "basic_2/computation/fpbg_fleq.ma".
+include "static_2/static/feqx_feqx.ma".
+include "basic_2/rt_transition/fpbq_fpb.ma".
+include "basic_2/rt_computation/fpbs_fqup.ma".
+include "basic_2/rt_computation/fpbg.ma".
 
-(* "QRST" PROPER PARALLEL COMPUTATION FOR CLOSURES **************************)
+(* PROPER PARALLEL RST-COMPUTATION FOR CLOSURES *****************************)
 
-(* Properties on "qrst" parallel reduction on closures **********************)
+(* Advanced forward lemmas **************************************************)
 
-lemma fpb_fpbg_trans: ∀h,o,G1,G,G2,L1,L,L2,T1,T,T2.
-                      ⦃G1, L1, T1⦄ ≻[h, o] ⦃G, L, T⦄ → ⦃G, L, T⦄ >≛[h, o] ⦃G2, L2, T2⦄ →
-                      ⦃G1, L1, T1⦄ >≛[h, o] ⦃G2, L2, T2⦄.
+lemma fpbg_fwd_fpbs:
+      ∀G1,G2,L1,L2,T1,T2.
+      ❪G1,L1,T1❫ > ❪G2,L2,T2❫ → ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫.
+#G1 #G2 #L1 #L2 #T1 #T2 *
+/3 width=5 by fpbs_strap2, fpb_fpbq/
+qed-.
+
+(* Advanced properties with sort-irrelevant equivalence on closures *********)
+
+(* Basic_2A1: uses: fleq_fpbg_trans *)
+lemma feqx_fpbg_trans:
+      ∀G,G2,L,L2,T,T2. ❪G,L,T❫ > ❪G2,L2,T2❫ →
+      ∀G1,L1,T1. ❪G1,L1,T1❫ ≛ ❪G,L,T❫ → ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
+#G #G2 #L #L2 #T #T2 * #G0 #L0 #T0 #H0 #H02 #G1 #L1 #T1 #H1
+elim (feqx_fpb_trans …  H1 … H0) -G -L -T
+/4 width=9 by fpbs_strap2, fpbq_feqx, ex2_3_intro/
+qed-.
+
+(* Properties with parallel proper rst-reduction on closures ****************)
+
+lemma fpb_fpbg_trans:
+      ∀G1,G,G2,L1,L,L2,T1,T,T2.
+      ❪G1,L1,T1❫ ≻ ❪G,L,T❫ → ❪G,L,T❫ > ❪G2,L2,T2❫ →
+      ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
 /3 width=5 by fpbg_fwd_fpbs, ex2_3_intro/ qed-.
 
-lemma fpbq_fpbg_trans: ∀h,o,G1,G,G2,L1,L,L2,T1,T,T2.
-                       ⦃G1, L1, T1⦄ ≽[h, o] ⦃G, L, T⦄ → ⦃G, L, T⦄ >≛[h, o] ⦃G2, L2, T2⦄ →
-                       ⦃G1, L1, T1⦄ >≛[h, o] ⦃G2, L2, T2⦄.
-#h #o #G1 #G #G2 #L1 #L #L2 #T1 #T #T2 #H1 #H2 @(fpbq_ind_alt … H1) -H1
-/2 width=5 by fleq_fpbg_trans, fpb_fpbg_trans/
+(* Properties with parallel rst-reduction on closures ***********************)
+
+lemma fpbq_fpbg_trans:
+      ∀G1,G,G2,L1,L,L2,T1,T,T2.
+      ❪G1,L1,T1❫ ≽ ❪G,L,T❫ → ❪G,L,T❫ > ❪G2,L2,T2❫ →
+      ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
+#G1 #G #G2 #L1 #L #L2 #T1 #T #T2 #H1 #H2
+elim (fpbq_inv_fpb … H1) -H1
+/2 width=5 by feqx_fpbg_trans, fpb_fpbg_trans/
 qed-.
 
-(* Properties on "qrst" parallel compuutation on closures *******************)
+(* Properties with parallel rst-compuutation on closures ********************)
 
-lemma fpbs_fpbg_trans: ∀h,o,G1,G,L1,L,T1,T. ⦃G1, L1, T1⦄ ≥[h, o] ⦃G, L, T⦄ →
-                       ∀G2,L2,T2. ⦃G, L, T⦄ >≛[h, o] ⦃G2, L2, T2⦄ → ⦃G1, L1, T1⦄ >≛[h, o] ⦃G2, L2, T2⦄.
-#h #o #G1 #G #L1 #L #T1 #T #H @(fpbs_ind … H) -G -L -T /3 width=5 by fpbq_fpbg_trans/
+lemma fpbs_fpbg_trans:
+      ∀G1,G,L1,L,T1,T. ❪G1,L1,T1❫ ≥ ❪G,L,T❫ →
+      ∀G2,L2,T2. ❪G,L,T❫ > ❪G2,L2,T2❫ → ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
+#G1 #G #L1 #L #T1 #T #H @(fpbs_ind … H) -G -L -T /3 width=5 by fpbq_fpbg_trans/
 qed-.
 
-(* Note: this is used in the closure proof *)
-lemma fpbg_fpbs_trans: ∀h,o,G,G2,L,L2,T,T2. ⦃G, L, T⦄ ≥[h, o] ⦃G2, L2, T2⦄ →
-                       ∀G1,L1,T1. ⦃G1, L1, T1⦄ >≛[h, o] ⦃G, L, T⦄ → ⦃G1, L1, T1⦄ >≛[h, o] ⦃G2, L2, T2⦄.
-#h #o #G #G2 #L #L2 #T #T2 #H @(fpbs_ind_dx … H) -G -L -T /3 width=5 by fpbg_fpbq_trans/
+(* Advanced properties with plus-iterated structural successor for closures *)
+
+lemma fqup_fpbg_trans:
+      ∀G1,G,L1,L,T1,T. ❪G1,L1,T1❫ ⬂+ ❪G,L,T❫ →
+      ∀G2,L2,T2. ❪G,L,T❫ > ❪G2,L2,T2❫ → ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
+/3 width=5 by fpbs_fpbg_trans, fqup_fpbs/ qed-.
+
+(* Advanced inversion lemmas of parallel rst-computation on closures ********)
+
+(* Basic_2A1: was: fpbs_fpbg *)
+lemma fpbs_inv_fpbg:
+      ∀G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ≥ ❪G2,L2,T2❫ →
+      ∨∨ ❪G1,L1,T1❫ ≛ ❪G2,L2,T2❫
+       | ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
+#G1 #G2 #L1 #L2 #T1 #T2 #H @(fpbs_ind … H) -G2 -L2 -T2
+[ /2 width=1 by or_introl/
+| #G #G2 #L #L2 #T #T2 #_ #H2 * #H1
+  elim (fpbq_inv_fpb … H2) -H2 #H2
+  [ /3 width=5 by feqx_trans, or_introl/
+  | elim (feqx_fpb_trans … H1 … H2) -G -L -T
+    /4 width=5 by ex2_3_intro, or_intror, feqx_fpbs/
+  | /3 width=5 by fpbg_feqx_trans, or_intror/
+  | /4 width=5 by fpbg_fpbq_trans, fpb_fpbq, or_intror/
+  ]
+]
 qed-.
 
-(* Note: this is used in the closure proof *)
-lemma fqup_fpbg: ∀h,o,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐+ ⦃G2, L2, T2⦄ → ⦃G1, L1, T1⦄ >≛[h, o] ⦃G2, L2, T2⦄.
-#h #o #G1 #G2 #L1 #L2 #T1 #T2 #H elim (fqup_inv_step_sn … H) -H
-/3 width=5 by fqus_fpbs, fpb_fqu, ex2_3_intro/
-qed.
-
-lemma cpxs_fpbg: ∀h,o,G,L,T1,T2. ⦃G, L⦄ ⊢ T1 ➡*[h, o] T2 →
-                 (T1 = T2 → ⊥) → ⦃G, L, T1⦄ >≛[h, o] ⦃G, L, T2⦄.
-#h #o #G #L #T1 #T2 #H #H0 elim (cpxs_neq_inv_step_sn … H … H0) -H -H0
-/4 width=5 by cpxs_fpbs, fpb_cpx, ex2_3_intro/
-qed.
-
-lemma lstas_fpbg: ∀h,o,G,L,T1,T2,d2. ⦃G, L⦄ ⊢ T1 •*[h, d2] T2 → (T1 = T2 → ⊥) →
-                  ∀d1. d2 ≤ d1 → ⦃G, L⦄ ⊢ T1 ▪[h, o] d1 → ⦃G, L, T1⦄ >≛[h, o] ⦃G, L, T2⦄.
-/3 width=5 by lstas_cpxs, cpxs_fpbg/ qed.
-
-lemma lpxs_fpbg: ∀h,o,G,L1,L2,T. ⦃G, L1⦄ ⊢ ➡*[h, o] L2 →
-                 (L1 ≡[T, 0] L2 → ⊥) → ⦃G, L1, T⦄ >≛[h, o] ⦃G, L2, T⦄.
-#h #o #G #L1 #L2 #T #H #H0 elim (lpxs_nlleq_inv_step_sn … H … H0) -H -H0
-/4 width=5 by fpb_lpx, lpxs_lleq_fpbs, ex2_3_intro/
-qed.
+(* Advanced properties of parallel rst-computation on closures **************)
+
+lemma fpbs_fpb_trans:
+      ∀F1,F2,K1,K2,T1,T2. ❪F1,K1,T1❫ ≥ ❪F2,K2,T2❫ →
+      ∀G2,L2,U2. ❪F2,K2,T2❫ ≻ ❪G2,L2,U2❫ →
+      ∃∃G1,L1,U1. ❪F1,K1,T1❫ ≻ ❪G1,L1,U1❫ & ❪G1,L1,U1❫ ≥ ❪G2,L2,U2❫.
+#F1 #F2 #K1 #K2 #T1 #T2 #H elim (fpbs_inv_fpbg … H) -H
+[ #H12 #G2 #L2 #U2 #H2 elim (feqx_fpb_trans … H12 … H2) -F2 -K2 -T2
+  /3 width=5 by feqx_fpbs, ex2_3_intro/
+| * #H1 #H2 #H3 #H4 #H5 #H6 #H7 #H8 #H9
+  @(ex2_3_intro … H4) -H4 /3 width=5 by fpbs_strap1, fpb_fpbq/
+]
+qed-.