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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/etc/head/path_structure_labels.etc b/matita/matita/contribs/lambdadelta/delayed_updating/etc/head/path_structure_labels.etc
deleted file mode 100644
index 0dcc367cd..000000000
--- a/matita/matita/contribs/lambdadelta/delayed_updating/etc/head/path_structure_labels.etc
+++ /dev/null
@@ -1,25 +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 "delayed_updating/syntax/path_structure.ma".
-include "delayed_updating/syntax/path_labels.ma".
-
-(* STRUCTURE FOR PATH *******************************************************)
-
-(* Constructions with labels ************************************************)
-
-lemma structure_labels_L (n):
-      (𝗟∗∗n) = ⊗(𝗟∗∗n).
-#n @(nat_ind_succ … n) -n //
-qed.