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diff --git a/matita/library/higher_order_defs/ordering.ma b/matita/library/higher_order_defs/ordering.ma
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index 000000000..c2b351d7a
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+++ b/matita/library/higher_order_defs/ordering.ma
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+(**************************************************************************)
+(*       ___	                                                            *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||       A.Asperti, C.Sacerdoti Coen,                          *)
+(*      ||A||       E.Tassi, S.Zacchiroli                                 *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU Lesser General Public License Version 2.1         *)
+(*                                                                        *)
+(**************************************************************************)
+
+set "baseuri" "cic:/matita/higher_order_defs/ordering/".
+
+include "logic/equality.ma".
+
+definition antisymmetric: \forall A:Type.\forall R:A \to A \to Prop.Prop
+\def 
+\lambda A.\lambda R.\forall x,y:A.R x y \to R y x \to x=y.
+