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diff --git a/matita/matita/contribs/lambdadelta/ground/etc/lib/oplus_4.etc b/matita/matita/contribs/lambdadelta/ground/etc/lib/oplus_4.etc
new file mode 100644
index 000000000..7905d518f
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/ground/etc/lib/oplus_4.etc
@@ -0,0 +1,29 @@
+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||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( l1 ⊕ break l2 )"
+  left associative with precedence 60
+  for @{ 'OPlus $A $B $l1 $l2 }.
+
+notation > "hvbox( l1 ⊕ break l2 )"
+  left associative with precedence 60
+  for @{ 'OPlus ? ? $l1 $l2 }.
+(*
+(**) fix pair notation
+notation > "hvbox( l1 ⊕{ break term 46 A, break term 46 A } break term 61 l2 )"
+  non associative with precedence 60
+  for @{ 'OPlus $A $B $l1 $l2 }.
+*)