Added the proof by Nielson & Nielson.
1 ISABELLE COPYRIGHT NOTICE, LICENCE AND DISCLAIMER.
3 Copyright (C) 1993 by the University of Cambridge, Cambridge, England.
5 Permission to use, copy, modify, and distribute this software and its
6 documentation for any non-commercial purpose and without fee is hereby
7 granted, provided that the above copyright notice appears in all copies and
8 that both the copyright notice and this permission notice and warranty
9 disclaimer appear in supporting documentation, and that the name of the
10 University of Cambridge not be used in advertising or publicity pertaining
11 to distribution of the software without specific, written prior permission.
13 The University of Cambridge disclaims all warranties with regard to this
14 software, including all implied warranties of merchantability and fitness.
15 In no event shall the University of Cambridge be liable for any special,
16 indirect or consequential damages or any damages whatsoever resulting from
17 loss of use, data or profits, whether in an action of contract, negligence
18 or other tortious action, arising out of or in connection with the use or
19 performance of this software.