X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=sidebyside;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frt_computation%2Ffpbg.ma;h=65002c21ef6e746aafe101fb163eeafa1d3da878;hb=3bf7a0b4185dbffe5b822c907956acdbe2d1c559;hp=1ce29c009e4859aae2dbc6fc90045f0975c0782f;hpb=4173283e148199871d787c53c0301891deb90713;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg.ma
index 1ce29c009..65002c21e 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg.ma
@@ -12,46 +12,52 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "basic_2/notation/relations/predsubtystarproper_7.ma".
-include "basic_2/rt_transition/fpb.ma".
+include "ground/xoa/ex_3_6.ma".
+include "basic_2/notation/relations/predsubtystarproper_6.ma".
+include "basic_2/rt_transition/fpbc.ma".
 include "basic_2/rt_computation/fpbs.ma".
 
 (* PROPER PARALLEL RST-COMPUTATION FOR CLOSURES *****************************)
 
-definition fpbg: ∀h. tri_relation genv lenv term ≝
-                 λh,G1,L1,T1,G2,L2,T2.
-                 ∃∃G,L,T. ⦃G1, L1, T1⦄ ≻[h] ⦃G, L, T⦄ & ⦃G, L, T⦄ ≥[h] ⦃G2, L2, T2⦄.
+definition fpbg: tri_relation genv lenv term ≝
+           λG1,L1,T1,G2,L2,T2.
+           ∃∃G3,L3,T3,G4,L4,T4. ❨G1,L1,T1❩ ≥ ❨G3,L3,T3❩ & ❨G3,L3,T3❩ ≻ ❨G4,L4,T4❩ & ❨G4,L4,T4❩ ≥ ❨G2,L2,T2❩.
 
-interpretation "proper parallel rst-computation (closure)"
-   'PRedSubTyStarProper h G1 L1 T1 G2 L2 T2 = (fpbg h G1 L1 T1 G2 L2 T2).
+interpretation
+  "proper parallel rst-computation (closure)"
+  'PRedSubTyStarProper G1 L1 T1 G2 L2 T2 = (fpbg G1 L1 T1 G2 L2 T2).
 
-(* Basic properties *********************************************************)
+(* Basic inversion lemmas ***************************************************)
 
-lemma fpb_fpbg: ∀h,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ≻[h] ⦃G2, L2, T2⦄ →
-                ⦃G1, L1, T1⦄ >[h] ⦃G2, L2, T2⦄.
-/2 width=5 by ex2_3_intro/ qed.
+lemma fpbg_inv_gen (G1) (G2) (L1) (L2) (T1) (T2):
+      ❨G1,L1,T1❩ > ❨G2,L2,T2❩ →
+      ∃∃G3,L3,T3,G4,L4,T4. ❨G1,L1,T1❩ ≥ ❨G3,L3,T3❩ & ❨G3,L3,T3❩ ≻ ❨G4,L4,T4❩ & ❨G4,L4,T4❩ ≥ ❨G2,L2,T2❩.
+// qed-.
 
-lemma fpbg_fpbq_trans: ∀h,G1,G,G2,L1,L,L2,T1,T,T2.
-                       ⦃G1, L1, T1⦄ >[h] ⦃G, L, T⦄ → ⦃G, L, T⦄ ≽[h] ⦃G2, L2, T2⦄ →
-                       ⦃G1, L1, T1⦄ >[h] ⦃G2, L2, T2⦄.
-#h #G1 #G #G2 #L1 #L #L2 #T1 #T #T2 *
-/3 width=9 by fpbs_strap1, ex2_3_intro/
-qed-.
+(* Basic properties *********************************************************)
 
-(* Note: this is used in the closure proof *)
-lemma fpbg_fpbs_trans: ∀h,G,G2,L,L2,T,T2. ⦃G, L, T⦄ ≥[h] ⦃G2, L2, T2⦄ →
-                       ∀G1,L1,T1. ⦃G1, L1, T1⦄ >[h] ⦃G, L, T⦄ → ⦃G1, L1, T1⦄ >[h] ⦃G2, L2, T2⦄.
-#h #G #G2 #L #L2 #T #T2 #H @(fpbs_ind_dx … H) -G -L -T /3 width=5 by fpbg_fpbq_trans/
+lemma fpbg_intro (G3) (G4) (L3) (L4) (T3) (T4):
+      ∀G1,L1,T1,G2,L2,T2.
+      ❨G1,L1,T1❩ ≥ ❨G3,L3,T3❩ → ❨G3,L3,T3❩ ≻ ❨G4,L4,T4❩ →
+      ❨G4,L4,T4❩ ≥ ❨G2,L2,T2❩ → ❨G1,L1,T1❩ > ❨G2,L2,T2❩.
+/2 width=9 by ex3_6_intro/ qed.
+
+(* Basic_2A1: was: fpbg_fpbq_trans *)
+lemma fpbg_fpb_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 (fpbg_inv_gen … H1) -H1
+/3 width=13 by fpbs_strap1, fpbg_intro/
 qed-.
 
-(* Basic_2A1: uses: fpbg_fleq_trans *)
-lemma fpbg_fdeq_trans: ∀h,G1,G,L1,L,T1,T. ⦃G1, L1, T1⦄ >[h] ⦃G, L, T⦄ →
-                       ∀G2,L2,T2. ⦃G, L, T⦄ ≛ ⦃G2, L2, T2⦄ → ⦃G1, L1, T1⦄ >[h] ⦃G2, L2, T2⦄.
-/3 width=5 by fpbg_fpbq_trans, fpbq_fdeq/ qed-.
-
-(* Properties with t-bound rt-transition for terms **************************)
-
-lemma cpm_tdneq_cpm_fpbg (h) (G) (L):
-                         ∀n1,T1,T. ⦃G, L⦄ ⊢ T1 ➡[n1,h] T → (T1 ≛ T → ⊥) →
-                         ∀n2,T2. ⦃G, L⦄ ⊢ T ➡[n2,h] T2 → ⦃G, L, T1⦄ >[h] ⦃G, L, T2⦄.
-/4 width=5 by fpbq_fpbs, cpm_fpbq, cpm_fpb, ex2_3_intro/ qed. 
+(* Basic_2A1: was: fpbq_fpbg_trans *)
+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❩.
+#G1 #G #G2 #L1 #L #L2 #T1 #T #T2 #H1 #H2
+elim (fpbg_inv_gen … H2) -H2
+/3 width=13 by fpbs_strap2, fpbg_intro/
+qed-.