The **Fourier expansion** of a Maass forrm on PSL$(2,\Z[i])$ reads
$$f(z)=\sum_{n\in\Z[i]}a(n)yK_{ir}(2\pi|n|y)e^{2\pi i\,\textrm{Re}(nx)},$$
where $K_{ir}(x)$ is a $K$-Bessel function and the expansion coefficients $a(n)$ are related to Hecke eigenvalues.

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**Knowl status:**

- Review status: beta
- Last edited by Andreea Mocanu on 2016-03-24 12:47:54

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