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diff --git a/matita/matita/contribs/lambda_delta/basic_2/grammar/term_weight.ma b/matita/matita/contribs/lambda_delta/basic_2/grammar/term_weight.ma
deleted file mode 100644
index d8f39a3a1..000000000
--- a/matita/matita/contribs/lambda_delta/basic_2/grammar/term_weight.ma
+++ /dev/null
@@ -1,43 +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/grammar/term.ma".
-
-(* WEIGHT OF A TERM *********************************************************)
-
-let rec tw T ≝ match T with
-[ TAtom _     ⇒ 1
-| TPair _ V T ⇒ tw V + tw T + 1
-].
-
-interpretation "weight (term)" 'Weight T = (tw T).
-
-(* Basic properties *********************************************************)
-
-(* Basic_1: was: tweight_lt *)
-lemma tw_pos: ∀T. 1 ≤ #{T}.
-#T elim T -T //
-qed.
-
-(* Basic eliminators ********************************************************)
-
-axiom tw_ind: ∀R:predicate term.
-              (∀T2. (∀T1. #{T1} < #{T2} → R T1) → R T2) →
-              ∀T. R T.
-
-(* Basic_1: removed theorems 11:
-            wadd_le wadd_lt wadd_O weight_le weight_eq weight_add_O
-            weight_add_S tlt_trans tlt_head_sx tlt_head_dx tlt_wf_ind
-            removed local theorems 1: q_ind
-*)