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diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/rex_lex.ma b/matita/matita/contribs/lambdadelta/basic_2/static/rex_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/relocation/lex.ma".
-include "basic_2/static/rex_fsle.ma".
-include "basic_2/static/req.ma".
-
-(* GENERIC EXTENSION ON REFERRED ENTRIES OF A CONTEXT-SENSITIVE REALTION ****)
-
-(* Properties with generic extension of a context-sensitive relation ********)
-
-lemma rex_lex: ∀R,L1,L2. L1 ⪤[R] L2 → ∀T. L1 ⪤[R, T] L2.
-#R #L1 #L2 * #f #Hf #HL12 #T
-elim (frees_total L1 T) #g #Hg
-/4 width=5 by sex_sdj, sdj_isid_sn, ex2_intro/
-qed.
-
-(* Inversion lemmas with generic extension of a context sensitive relation **)
-
-lemma rex_inv_lex_req: ∀R. c_reflexive … R →
-                       rex_fsge_compatible R →
-                       ∀L1,L2,T. L1 ⪤[R, T] L2 →
-                       ∃∃L. L1 ⪤[R] L & L ≡[T] L2.
-#R #H1R #H2R #L1 #L2 #T * #f1 #Hf1 #HL
-elim (sex_sdj_split … ceq_ext … HL 𝐈𝐝 ?) -HL
-[ #L0 #HL10 #HL02 |*: /2 width=1 by ext2_refl, sdj_isid_dx/ ] -H1R
-lapply (sex_sdj … HL10 f1 ?) /2 width=1 by sdj_isid_sn/ #H
-elim (frees_sex_conf … Hf1 … H) // -H2R -H #f0 #Hf0 #Hf01
-/4 width=7 by sle_sex_trans, (* 2x *) ex2_intro/
-qed-.