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diff --git a/matita/matita/contribs/lambdadelta/delayed_updating/notation/functions/black_righttriangle_2.ma b/matita/matita/contribs/lambdadelta/delayed_updating/notation/functions/black_righttriangle_2.ma
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+++ b/matita/matita/contribs/lambdadelta/delayed_updating/notation/functions/black_righttriangle_2.ma
@@ -0,0 +1,19 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+(* NOTATION FOR DELAYED UPDATING ********************************************)
+
+notation "hvbox( ▶[ term 46 f ] break term 70 p )"
+  non associative with precedence 70
+  for @{ 'BlackRightTriangle $f $p }.