Hello All, I have been investigating using GiNac to solve certain equations and was unsure of what is was capable of. Although I saw the lsovle() function for solving systems of linear equations, I was baffled as how to solve a non-linear equation of the form: 0 = deriv(sqrt( (X - x*t)^2 + (Y - y*t)^2 + (Z - z*t - Gt^2)^2 )) Alternatively, if it is not capable of solving such an equation, if you knew of a C/C++ library (short of matlab) that was capable. Thanks, -Mike __________________________________ Do you Yahoo!? Meet the all-new My Yahoo! - Try it today! http://my.yahoo.com