My friend RobinNewton pointed me at all this. I am frankly impressed at an excellent information-sharing mechanism. You can find my scribblings on the web at http://www.chaos.org.uk/~eddy/ , and if you know of a mathematical wiki, please tell me where to find it - ''eg'' by adding to this page ;^) ''Hi Eddy - are you the Eddy I knew at Cambridge? Do you know Andrew Lipson? Are you still here?'' ---- CategoryHomePage