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diff --git a/matita/matita/contribs/lambdadelta/alpha_1/grammar/term_append.ma b/matita/matita/contribs/lambdadelta/alpha_1/grammar/term_append.ma
deleted file mode 100644
index 98ce3bafd..000000000
--- a/matita/matita/contribs/lambdadelta/alpha_1/grammar/term_append.ma
+++ /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 "alpha_1/grammar/term.ma".
-
-(* TERMS ********************************************************************)
-
-let rec tappend T U on T ≝ match T with
-[ TAtom       ⇒ U
-| TUnit I T   ⇒ ①{I}.(tappend T U)
-| TPair I V T ⇒ ②{I}V.(tappend T U)
-].
-
-interpretation "append (term)" 'Append T U = (tappend T U).