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diff --git a/matita/matita/contribs/lambdadelta/static_2/syntax/lenv_weight.ma b/matita/matita/contribs/lambdadelta/static_2/syntax/lenv_weight.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 "static_2/syntax/bind_weight.ma".
+include "static_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 *)