X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fstatic_2%2Fstatic%2Freq.ma;h=59efd1af8f640cbc0d1d2b43902467c7c75fe214;hp=b53ef17559be823ba437c3a92daf35dad4cd9c8c;hb=b118146b97959e6a6dde18fdd014b8e1e676a2d1;hpb=613d8642b1154dde0c026cbdcd96568910198251

diff --git a/matita/matita/contribs/lambdadelta/static_2/static/req.ma b/matita/matita/contribs/lambdadelta/static_2/static/req.ma
index b53ef1755..59efd1af8 100644
--- a/matita/matita/contribs/lambdadelta/static_2/static/req.ma
+++ b/matita/matita/contribs/lambdadelta/static_2/static/req.ma
@@ -13,13 +13,14 @@
 (**************************************************************************)
 
 include "static_2/notation/relations/ideqsn_3.ma".
-include "static_2/static/rex.ma".
+include "static_2/syntax/teq_ext.ma".
+include "static_2/static/reqg.ma".
 
 (* SYNTACTIC EQUIVALENCE FOR LOCAL ENVIRONMENTS ON REFERRED ENTRIES *********)
 
 (* Basic_2A1: was: lleq *)
 definition req: relation3 term lenv lenv ≝
-           rex ceq.
+           reqg (eq …).
 
 interpretation
   "syntactic equivalence on referred entries (local environment)"
@@ -35,12 +36,12 @@ definition R_transitive_req: predicate (relation3 lenv term term) ≝
 lemma req_inv_bind:
       ∀p,I,L1,L2,V,T. L1 ≡[ⓑ[p,I]V.T] L2 →
       ∧∧ L1 ≡[V] L2 & L1.ⓑ[I]V ≡[T] L2.ⓑ[I]V.
-/2 width=2 by rex_inv_bind/ qed-.
+/2 width=2 by reqg_inv_bind_refl/ qed-.
 
 lemma req_inv_flat:
       ∀I,L1,L2,V,T. L1 ≡[ⓕ[I]V.T] L2 →
       ∧∧ L1 ≡[V] L2 & L1 ≡[T] L2.
-/2 width=2 by rex_inv_flat/ qed-.
+/2 width=2 by reqg_inv_flat/ qed-.
 
 (* Advanced inversion lemmas ************************************************)
 
@@ -48,27 +49,29 @@ lemma req_inv_zero_pair_sn:
       ∀I,L2,K1,V. K1.ⓑ[I]V ≡[#0] L2 →
       ∃∃K2. K1 ≡[V] K2 & L2 = K2.ⓑ[I]V.
 #I #L2 #K1 #V #H
-elim (rex_inv_zero_pair_sn … H) -H #K2 #X #HK12 #HX #H destruct
-/2 width=3 by ex2_intro/
+elim (reqg_inv_zero_pair_sn … H) -H #K2 #X #HK12 #HX #H destruct
+@(teq_repl_1 … HX) -X
+@(ex2_intro … HK12) // (**) (* auto fails because a δ-expamsion gets in the way *)
 qed-.
 
 lemma req_inv_zero_pair_dx:
       ∀I,L1,K2,V. L1 ≡[#0] K2.ⓑ[I]V →
       ∃∃K1. K1 ≡[V] K2 & L1 = K1.ⓑ[I]V.
 #I #L1 #K2 #V #H
-elim (rex_inv_zero_pair_dx … H) -H #K1 #X #HK12 #HX #H destruct
-/2 width=3 by ex2_intro/
+elim (reqg_inv_zero_pair_dx … H) -H #K1 #X #HK12 #HX #H destruct
+@(teq_repl_1 … HX) -V
+@(ex2_intro … HK12) // (**) (* auto fails because a δ-expamsion gets in the way *)
 qed-.
 
 lemma req_inv_lref_bind_sn:
       ∀I1,K1,L2,i. K1.ⓘ[I1] ≡[#↑i] L2 →
       ∃∃I2,K2. K1 ≡[#i] K2 & L2 = K2.ⓘ[I2].
-/2 width=2 by rex_inv_lref_bind_sn/ qed-.
+/2 width=2 by reqg_inv_lref_bind_sn/ qed-.
 
 lemma req_inv_lref_bind_dx:
       ∀I2,K2,L1,i. L1 ≡[#↑i] K2.ⓘ[I2] →
       ∃∃I1,K1. K1 ≡[#i] K2 & L1 = K1.ⓘ[I1].
-/2 width=2 by rex_inv_lref_bind_dx/ qed-.
+/2 width=2 by reqg_inv_lref_bind_dx/ qed-.
 
 (* Basic forward lemmas *****************************************************)
 
@@ -78,34 +81,18 @@ lemma req_fwd_rex (R):
       c_reflexive … R →
       ∀L1,L2,T. L1 ≡[T] L2 → L1 ⪤[R,T] L2.
 #R #HR #L1 #L2 #T * #f #Hf #HL12
-/4 width=7 by sex_co, cext2_co, ex2_intro/
+/5 width=7 by sex_co, cext2_co, teq_repl_1, ex2_intro/
 qed-.
 
-(* Basic_properties *********************************************************)
-
-lemma frees_req_conf:
-      ∀f,L1,T. L1 ⊢ 𝐅+❪T❫ ≘ f →
-      ∀L2. L1 ≡[T] L2 → L2 ⊢ 𝐅+❪T❫ ≘ f.
-#f #L1 #T #H elim H -f -L1 -T
-[ /2 width=3 by frees_sort/
-| #f #i #Hf #L2 #H2
-  >(rex_inv_atom_sn … H2) -L2
-  /2 width=1 by frees_atom/
-| #f #I #L1 #V1 #_ #IH #Y #H2
-  elim (req_inv_zero_pair_sn … H2) -H2 #L2 #HL12 #H destruct
-  /3 width=1 by frees_pair/
-| #f #I #L1 #Hf #Y #H2
-  elim (rex_inv_zero_unit_sn … H2) -H2 #g #L2 #_ #_ #H destruct
-  /2 width=1 by frees_unit/
-| #f #I #L1 #i #_ #IH #Y #H2
-  elim (req_inv_lref_bind_sn … H2) -H2 #J #L2 #HL12 #H destruct
-  /3 width=1 by frees_lref/
-| /2 width=1 by frees_gref/
-| #f1V #f1T #f1 #p #I #L1 #V1 #T1 #_ #_ #Hf1 #IHV #IHT #L2 #H2
-  elim (req_inv_bind … H2) -H2 /3 width=5 by frees_bind/
-| #f1V #f1T #f1 #I #L1 #V1 #T1 #_ #_ #Hf1 #IHV #IHT #L2 #H2
-  elim (req_inv_flat … H2) -H2 /3 width=5 by frees_flat/
-]
+lemma req_fwd_reqg (S) (T:term):
+      reflexive … S →
+      ∀L1,L2. L1 ≡[T] L2 → L1 ≛[S,T] L2.
+/3 width=1 by req_fwd_rex, teqg_refl/ qed-.
+
+lemma transitive_req_fwd_rex (R):
+      R_transitive_req R → R_transitive_rex ceq R R.
+#R #HR #L1 #L #T1 #HL1 #T #HT #T2 #HT2
+@(HR … HL1) -HR -HL1 >(teq_inv_eq … HT) -T1 // (**)
 qed-.
 
 (* Basic_2A1: removed theorems 10: