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diff --git a/matita/matita/contribs/lambdadelta/basic_2/notation/relations/lrsubeqa_3.ma b/matita/matita/contribs/lambdadelta/basic_2/notation/relations/lrsubeqa_3.ma
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@@ -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 THE FORMAL SYSTEM λδ ****************************************)
+
+notation "hvbox( G ⊢ break term 46 L1 ⁝ ⊑ break term 46 L2 )"
+   non associative with precedence 45
+   for @{ 'LRSubEqA $G $L1 $L2 }.