Well, my little demonstration was favourably received; I wrote it up after as a sort of report, which you can find at http://rgmia.vu.edu.au/seminars/maxima.pdf cheers, Alasdair -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.math.utexas.edu/pipermail/maxima/attachments/20070404/e8256c15/attachment.htm