Copyright (C) 2000, HELM Team.

This file is part of HELM, an Hypertextual, Electronic
Library of Mathematics, developed at the Computer Science
Department, University of Bologna, Italy.

HELM is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

HELM is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with HELM; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

For details, see the HELM World-Wide-Web page,
http://cs.unibo.it/helm/.