Full credit for material content remains with John, however I am entitled to
a substantial share in credit for typographical and other errors of
presentation in the HTML edition.
If you put a link to this paper on your own web pages you should be aware that
my site is probably going to move fairly soon.
When it does I will post to qed the new URL's of items related to qed.
Roger Jones http://www.cybercom.net/~rbjones/
at home email@example.com