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The group $\Gamma_0(N)$ in degree $g$ is a subgroup of the integral symplectic group $\operatorname{Sp}(2g,{\Bbb Z})$, defined by $$\Gamma_0(N)=\left\{ \begin{pmatrix}A&B\\C&D\end{pmatrix}\in \operatorname{Sp}(2g,{\Bbb Z}) : C \equiv 0 \pmod N \right\}.$$

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• Review status: beta
• Last edited by Alex J. Best on 2018-12-13 14:19:57
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