With the Birch-Swinnerton-Dyer conjecture, has anyone ever taken the logarithmic derivative of the Euler product in question wrt to the Euler product, and followed this line of argument through into the Taylor series? Jon Perry perry@globalnet.co.uk http://www.users.globalnet.co.uk/~perry/maths/ http://www.users.globalnet.co.uk/~perry/DIVMenu/ BrainBench MVP for HTML and JavaScript http://www.brainbench.com