Acknowledgements.

After this paper was put up on the net, I've had quite a few emails about them. Some of them has pointed out bugs etc.

Among the ones I want to say thanks to for making improving suggestions and pointing out bugs are

EARAUJO@pactual.com.br
Jens Larsson <d96-jla@d.kth.se>
Michael L Locher
Lars Gregori
Steve Bellantoni <scj@cs.toronto.edu>
Steven Leadbeater <steven.leadbeater@edfman.com>
Ariel Almedal
Lotti Luca, Milano, Italy
jean-paul.beveraggi@gadz.org

2003-10-22