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diff --git a/matita/matita/contribs/lambdadelta/ground/notation/relations/isidentity_1.ma b/matita/matita/contribs/lambdadelta/ground/notation/relations/isidentity_1.ma
deleted file mode 100644
index 43fdded1b..000000000
--- a/matita/matita/contribs/lambdadelta/ground/notation/relations/isidentity_1.ma
+++ /dev/null
@@ -1,19 +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                  *)
-(*                                                                        *)
-(**************************************************************************)
-
-(* GROUND NOTATION **********************************************************)
-
-notation "hvbox( 𝐈❪ term 46 f ❫ )"
-  non associative with precedence 45
-  for @{ 'IsIdentity $f }.