# Given a zero of an associated Legendre function, how to find its order?

1. Aug 4, 2011

### Jk_TJ

Given the function

g($\theta$) = P1v(cos$\theta$)/sin$\theta$ + dP1v(cos$\theta$)/d$\theta$

where
P1v(cos$\theta$)
is the associated Legendre function of the first kind.

If $\theta$ is a constant, for ex. $\theta$ = 20º or other angle, how could I find the order v in a way that g($\theta$) = 0 ???

Thanks any help!