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diff --git a/matita/matita/lib/basics/core_notation/downarrow_1.ma b/matita/matita/lib/basics/core_notation/downarrow_1.ma
new file mode 100644
index 000000000..717f0ee32
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+++ b/matita/matita/lib/basics/core_notation/downarrow_1.ma
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+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department of the University of Bologna, Italy.                     
+    ||I||                                                                 
+    ||T||  
+    ||A||  This file is distributed under the terms of the 
+    \   /  GNU General Public License Version 2        
+     \ /      
+      V_______________________________________________________________ *)
+
+(* Core notation *******************************************************)
+
+notation < "↓ \ensp a" with precedence 60 for @{ 'downarrow $a }.
+
+notation > "↓ a" with precedence 60 for @{ 'downarrow $a }.