X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frt_computation%2Ffsb.ma;h=f1434a06f0c9966a44f240fb2db3b407dd4d9b13;hb=e0c91d8a4422da0b39aca790e5826dc8a617b303;hp=925beb513f1e215a87a89e0676688f201cbbfd56;hpb=1fd62f1ce4f8209dec780d80aa53b140a8882ad7;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fsb.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fsb.ma
index 925beb513..f1434a06f 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fsb.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_computation/fsb.ma
@@ -12,35 +12,40 @@
 (*                                                                        *)
 (**************************************************************************)
 
-include "basic_2/notation/relations/predsubtystrong_5.ma".
-include "basic_2/rt_transition/fpb.ma".
+include "basic_2/notation/relations/predsubtystrong_3.ma".
+include "basic_2/rt_transition/fpbc.ma".
 
 (* STRONGLY NORMALIZING CLOSURES FOR PARALLEL RST-TRANSITION ****************)
 
-inductive fsb (h) (o): relation3 genv lenv term ≝
-| fsb_intro: ∀G1,L1,T1. (
-                ∀G2,L2,T2. ⦃G1, L1, T1⦄ ≻[h, o] ⦃G2, L2, T2⦄ → fsb h o G2 L2 T2
-             ) → fsb h o G1 L1 T1
-.
+definition fsb: relation3 genv lenv term ≝
+           SN3 … fpb (feqg sfull).
 
 interpretation
-   "strong normalization for parallel rst-transition (closure)"
-   'PRedSubTyStrong h o G L T = (fsb h o G L T).
+  "strong normalization for parallel rst-transition (closure)"
+  'PRedSubTyStrong G L T = (fsb G L T).
+
+(* Basic properties *********************************************************)
+
+lemma fsb_intro (G1) (L1) (T1):
+      (∀G2,L2,T2. ❨G1,L1,T1❩ ≻ ❨G2,L2,T2❩ → ≥𝐒 ❨G2,L2,T2❩) → ≥𝐒 ❨G1,L1,T1❩.
+/5 width=1 by fpbc_intro, SN3_intro/ qed.
 
 (* Basic eliminators ********************************************************)
 
 (* Note: eliminator with shorter ground hypothesis *)
-(* Note: to be named fsb_ind when fsb becomes a definition like csx, lfsx ***)
-lemma fsb_ind_alt: ∀h,o. ∀R: relation3 …. (
-                      ∀G1,L1,T1. ≥[h,o] 𝐒⦃G1, L1, T1⦄ → (
-                         ∀G2,L2,T2. ⦃G1, L1, T1⦄ ≻[h, o] ⦃G2, L2, T2⦄ → R G2 L2 T2
-                      ) → R G1 L1 T1
-                   ) →
-                   ∀G,L,T. ≥[h, o] 𝐒⦃G, L, T⦄ → R G L T.
-#h #o #R #IH #G #L #T #H elim H -G -L -T
-/4 width=1 by fsb_intro/
+lemma fsb_ind (Q:relation3 …):
+      (∀G1,L1,T1. ≥𝐒 ❨G1,L1,T1❩ →
+        (∀G2,L2,T2. ❨G1,L1,T1❩ ≻ ❨G2,L2,T2❩ → Q G2 L2 T2) →
+        Q G1 L1 T1
+      ) →
+      ∀G,L,T. ≥𝐒 ❨G,L,T❩ → Q G L T.
+#Q #IH #G #L #T #H elim H -G -L -T
+#G1 #L1 #T1 #H1 #IH1
+@IH -IH [ /4 width=1 by SN3_intro/ ] -H1 #G2 #L2 #T2 #H
+elim (fpbc_inv_gen sfull … H) -H #H12 #Hn12 /3 width=1 by/
 qed-.
 
-(* Basic_2A1: removed theorems 5:
+(* Basic_2A1: removed theorems 6:
               fsba_intro fsba_ind_alt fsba_fpbs_trans fsb_fsba fsba_inv_fsb
+              aaa_fsba
 *)