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diff --git a/matita/matita/contribs/lambdadelta/basic_2/etc/tdpos/positive_3.etc b/matita/matita/contribs/lambdadelta/basic_2/etc/tdpos/positive_3.etc
new file mode 100644
index 000000000..e73de4930
--- /dev/null
+++ b/matita/matita/contribs/lambdadelta/basic_2/etc/tdpos/positive_3.etc
@@ -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( 𝐏 [ term 46 h, term 46 o ] ⦃ term 46 T ⦄ )"
+   non associative with precedence 45
+   for @{ 'Positive $h $o $T }.