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The group $\Gamma_0(N)$ is the subgroup of $\textrm{SL}(2,\mathbb{Z})$ that consists of matrices that become upper triangular when reduced modulo $N$. That is, $\Gamma_0(N) = \left\lbrace \left .\begin{pmatrix} a & b \\ c & d \end{pmatrix}\in \textrm{SL}(2,\mathbb{Z})\ \right|\ c\equiv 0\pmod N \right\rbrace.$

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• Review status: beta
• Last edited by John Jones on 2012-04-18 07:13:39
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