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The general solution is:

[tex]u(r, \theta, \phi) = \sum^{\infty}_{l=0}\sum^{l}_{m=-l}\left(a_{lm}r^{l} + \frac{b_{lm}}{r^{l+1}}\right)P_{lm}(cos\theta)e^{im\phi}[/tex]

(where the [tex]a_{lm}, b_{lm}[/tex] coefficients can be found using the boundary conditions in question.)

My problem lies in trying to understand the limits on the summation [tex]\sum^{l}_{m=-l}[/tex]. Can anyone offer any help on this please?

Thanks for reading, b.