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diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/lsubr_lsubr.ma b/matita/matita/contribs/lambdadelta/basic_2/static/lsubr_lsubr.ma
deleted file mode 100644
index ac9691aa6..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/static/lsubr_lsubr.ma
+++ /dev/null
@@ -1,32 +0,0 @@
-(**************************************************************************)
-(*       ___                                                              *)
-(*      ||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/lsubr.ma".
-
-(* RESTRICTED REFINEMENT FOR LOCAL ENVIRONMENTS *****************************)
-
-(* Main properties **********************************************************)
-
-theorem lsubr_trans: Transitive … lsubr.
-#L1 #L #H elim H -L1 -L //
-[ #I #L1 #L #_ #IH #X #H elim (lsubr_inv_bind1 … H) -H *
-  [ #L2 #HL2 #H | #L2 #V #W #HL2 #H1 #H2 | #I1 #I2 #L2 #V #Hl2 #H1 #H2 ]
-  destruct /3 width=1 by lsubr_bind, lsubr_beta, lsubr_unit/
-| #L1 #L #V #W #_ #IH #X #H elim (lsubr_inv_abst1 … H) -H *
-  [ #L2 #HL2 #H | #I #L2 #HL2 #H ]
-  destruct /3 width=1 by lsubr_beta, lsubr_unit/
-| #I1 #I2 #L1 #L #V #_ #IH #X #H elim (lsubr_inv_unit1 … H) -H
-  /4 width=1 by lsubr_unit/
-]
-qed-.