- transcript: bugfix

[helm.git] / helm / software / matita / library / didactic / exercises / duality.ma

diff --git a/helm/software/matita/library/didactic/exercises/duality.ma b/helm/software/matita/library/didactic/exercises/duality.ma
index dca98ddc7652616d5e2f9a63977e28f061bd3e19..aa1aa32f8859e4602b8c8eb186ab7968cdb699a7 100644 (file)
--- a/helm/software/matita/library/didactic/exercises/duality.ma
+++ b/helm/software/matita/library/didactic/exercises/duality.ma
@@ -1,3 +1,17 @@
+(**************************************************************************)
+(*       ___                                                             *)
+(*      ||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         *)
+(*                                                                        *)
+(**************************************************************************)
+
 (* Esercizio 0
    ===========