# Orthogonality relations for Hankel functions

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1. May 15, 2015

### Septim

Where can I find and how can I derive the orthogonality relations for Hankel's functions defined as follows:

$H^{(1)}_{m}(z) \equiv J_{n}(z) +i Y_{n}(z)$
$H^{(2)}_{m}(z) \equiv J_{n}(z) - i Y_{n}(z)$

Any help is greatly appreciated.

Thanks

2. May 20, 2015