Basic Mathematica programming
http://nibot-lab.livejournal.com/58536.html
Implementing some generic arithmetic
http://nibot-lab.livejournal.com/58642.html
Section 1.4 (Computing actions)
http://nibot-lab.livejournal.com/58910.html
Tobin
--
Department of Physics, University of Rochester, Rochester NY 14627-0171
http://web.pas.rochester.edu/~tobin/