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diff --git a/matita/matita/contribs/lambdadelta/basic_2/syntax/lenv_weight.ma b/matita/matita/contribs/lambdadelta/basic_2/syntax/lenv_weight.ma
deleted file mode 100644
index 74a388944..000000000
--- a/matita/matita/contribs/lambdadelta/basic_2/syntax/lenv_weight.ma
+++ /dev/null
@@ -1,35 +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/syntax/bind_weight.ma".
-include "basic_2/syntax/lenv.ma".
-
-(* WEIGHT OF A LOCAL ENVIRONMENT ********************************************)
-
-rec definition lw L ≝ match L with
-[ LAtom     ⇒ 0
-| LBind L I ⇒ lw L + ♯{I}
-].
-
-interpretation "weight (local environment)" 'Weight L = (lw L).
-
-(* Basic properties *********************************************************)
-
-(* Basic_2A1: uses: lw_pair *)
-lemma lw_bind: ∀I,L. ♯{L} < ♯{L.ⓘ{I}}.
-normalize /2 width=1 by monotonic_le_plus_r/ qed.
-
-(* Basic_1: removed theorems 4: clt_cong clt_head clt_thead clt_wf_ind *)
-(* Basic_1: removed local theorems 1: clt_wf__q_ind *)
-(* Basic_1: note: clt_thead should be renamed clt_ctail *)