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diff --git a/matita/matita/contribs/lambdadelta/basic_2/computation/lpxs_ldrop.ma b/matita/matita/contribs/lambdadelta/basic_2/computation/lpxs_ldrop.ma
deleted file mode 100644
index d8c489017..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/computation/lpxs_ldrop.ma
+++ /dev/null
@@ -1,29 +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/reduction/lpx_ldrop.ma".
-include "basic_2/computation/lpxs.ma".
-
-(* SN EXTENDED PARALLEL COMPUTATION ON LOCAL ENVIRONMENTS *******************)
-
-(* Properies on local environment slicing ***********************************)
-
-lemma lpxs_ldrop_conf: ∀h,g,G. dropable_sn (lpxs h g G).
-/3 width=3 by dropable_sn_TC, lpx_ldrop_conf/ qed-.
-
-lemma ldrop_lpxs_trans: ∀h,g,G. dedropable_sn (lpxs h g G).
-/3 width=3 by dedropable_sn_TC, ldrop_lpx_trans/ qed-.
-
-lemma lpxs_ldrop_trans_O1: ∀h,g,G. dropable_dx (lpxs h g G).
-/3 width=3 by dropable_dx_TC, lpx_ldrop_trans_O1/ qed-.