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Yes that true :) But the radial equation can be rewritten quite easily into Bessels differential equation.

Perfect, thanks a lot! :)

Hey! I am trying to solve this quite nasty (as least I think so : - ) partial differential equation (the Helmholtz equation): \frac{1}{r}\frac{\partial}{\partial r} \left( r \frac{\partial\Psi}{\partial r}\right) + \frac{1}{r^2}\frac{\partial^2 \Psi}{\partial \phi^2} + \frac{\partial^2...