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diff --git a/matita/matita/contribs/lambdadelta/ground/notation/relations/parallel_2.ma b/matita/matita/contribs/lambdadelta/ground/notation/relations/parallel_2.ma
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index 000000000..dbbc88185
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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 ****************************)
+
+notation "hvbox( f1 ∥ break term 46 f2 )"
+   non associative with precedence 45
+   for @{ 'Parallel $f1 $f2 }.