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diff --git a/matita/matita/contribs/lambda_delta/ground_2/notation.ma b/matita/matita/contribs/lambda_delta/ground_2/notation.ma
deleted file mode 100644
index 4ac2e6e64..000000000
--- a/matita/matita/contribs/lambda_delta/ground_2/notation.ma
+++ /dev/null
@@ -1,47 +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                  *)
-(*                                                                        *)
-(**************************************************************************)
-
-(* GENERAL NOTATION USED BY THE FORMAL SYSTEM λδ ****************************)
-
-(* Logic ********************************************************************)
-
-notation "⊥"
-  non associative with precedence 90
-  for @{'false}.
-
-notation "⊤"
-  non associative with precedence 90
-  for @{'true}.
-
-(* Lists ********************************************************************)
-
-notation "◊"
-  non associative with precedence 90
-  for @{'Nil}.
-
-notation "hvbox( hd @ break tl )"
-  right associative with precedence 47
-  for @{'Cons $hd $tl}.
-
-notation "hvbox( l1 @@ break l2 )"
-  right associative with precedence 47
-  for @{'Append $l1 $l2 }.
-
-notation "⟠"
-  non associative with precedence 90
-  for @{'Nil2}.
-
-notation "hvbox( { hd1 , break hd2 } @ break tl )"
-  non associative with precedence 47
-  for @{'Cons $hd1 $hd2 $tl}.