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diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/req_fsle.ma b/matita/matita/contribs/lambdadelta/basic_2/static/req_fsle.ma
deleted file mode 100644
index 7662395c0..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/static/req_fsle.ma
+++ /dev/null
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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/static/rex_length.ma".
-include "basic_2/static/rex_fsle.ma".
-include "basic_2/static/req.ma".
-
-(* SYNTACTIC EQUIVALENCE FOR LOCAL ENVIRONMENTS ON REFERRED ENTRIES *********)
-
-(* Properties with free variables inclusion for restricted closures *********)
-
-lemma req_fsle_comp: rex_fsle_compatible ceq.
-#L1 #L2 #T #HL12
-elim (frees_total L1 T)
-/4 width=8 by frees_req_conf, rex_fwd_length, lveq_length_eq, sle_refl, ex4_4_intro/
-qed.
-
-(* Forward lemmas with free variables inclusion for restricted closures *****)
-
-lemma req_rex_trans: ∀R. req_transitive R →
-                     ∀L1,L,T. L1 ≡[T] L → ∀L2. L ⪤[R, T] L2 → L1 ⪤[R, T] L2.
-/4 width=16 by req_fsle_comp, rex_trans_fsle, rex_trans_next/ qed-.