--- /dev/null
+(**************************************************************************)
+(* ___ *)
+(* ||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;
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