I'm just starting a class project to implement formal manipulation for various functions useful for physics. Just looking at the basis though, I'm not sure whether to implement this as an object with ginac as a component class, or an extension to ginac. The results of my doodling will be released of course. The first means my project is independant of ginac insofar that I don't care about the version unless the interface changes. The second seems more ideologically pure, but implies much patching and such headaches for every version. I'm guessing the first, unless someone wants me to integrate my efforts with ginac, which I'm not sure belong to the project. For reference, some of the functions I plan to implement Sperical harmonics Integration Bessel functions And blah and blah and blah reading out of my mathematics for physicists book. Ron - To UNSUBSCRIBE, email to ginac-list@ginac.de with a subject of "unsubscribe".