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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                  *)
(*                                                                        *)
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(* GENERAL NOTATION USED BY THE FORMAL SYSTEM λδ ****************************)

notation "hvbox( x ⊞ break term 46 y1 ⊟ break term 46 y2 ≡ break term 46 z )"
  non associative with precedence 45
  for @{ 'RPlusMinus $x $y1 $y2 $z }.