- ext2_tc added

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / relocation / lex.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/relocation/lex.ma b/matita/matita/contribs/lambdadelta/basic_2/relocation/lex.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+include "basic_2/notation/relations/relation_3.ma".
+include "basic_2/relocation/lexs.ma".
+
+(* GENERIC EXTENSION OF A CONTEXT-SENSITIVE REALTION ON TERMS ***************)
+
+(* Basic_2A1: includes: lpx_sn_atom lpx_sn_pair *)
+definition lex: (lenv → relation bind) → relation lenv ≝
+                λR,L1,L2. ∃∃f. 𝐈⦃f⦄ & L1 ⪤*[cfull, R, f] L2.
+
+interpretation "generic extension (local environment)"
+   'Relation R L1 L2 = (lex R L1 L2).