# Volume Integral Orthogonal Polynomials

1. Mar 12, 2014

### VVS

Hello.

1. The problem statement, all variables and given/known data
Basically I want to evaluate the integral as shown in this document:
View attachment integral.pdf

2. Relevant equations

3. The attempt at a solution
The integral with the complex exponentials yields a Kronecker Delta.
My question is whether this Delta can be taken inside the integral over phi space?

2. Mar 12, 2014

### BvU

I think so. That is to say you can simply replace p by m and forget about $\theta$.
Check for a possible constant factor in case you want to look at orthonormality. For orthogonality you don't have to bother.

3. Mar 13, 2014

Thanks