Hi, A new GiNaC release is out and available. These are the changes: * Fixed pow(+(...),2).expand() where the sum contained roots of rationals. * Various improvements for info(info_flags::nonnegative). * Make power::expand() (x*p)^c -> x^c * p^c, if p>0. * Fixed normal() where nested functions occur multiple times. * Add optional explicit derivatives to functions and use it in abs(), imag_part(), real_part(). * Evaluate abs(z)^(2n) -> z^n * conjugate(z)^n. Happy hacking -richy. -- Richard B. Kreckel <http://in.terlu.de/~kreckel/>