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diff --git a/matita/matita/contribs/dama/dama_duality/constructive_pointfree/lebesgue.ma b/matita/matita/contribs/dama/dama_duality/constructive_pointfree/lebesgue.ma
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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                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+
+
+include "metric_lattice.ma".
+include "sequence.ma".
+include "constructive_connectives.ma".
+
+(* Section 3.2 *)
+
+(* 3.21 *)
+
+
+(* 3.17 *)
+
+
+(* 3.20 *)
+lemma uniq_sup: ∀O:ogroup.∀s:sequence O.∀x,y:O. is_sup ? s x → is_sup ? s y → x ≈ y.
+intros; 
\ No newline at end of file