Gamma 0 congruence subgroup
= Gamma 0 congruence subgroup
{c}
{title2=$\Gamma_0(N)$}
The Gamma 0 congruence subgroup is
$$
\Gamma_0(N)=\left\{\begin{pmatrix}a&b\\c&d\end{pmatrix}\in SL_2(\mathbb Z):c\equiv0\pmod N\right\}.
$$
= Gamma 0 congruence subgroup
{c}
{title2=$\Gamma_0(N)$}
The Gamma 0 congruence subgroup is
$$
\Gamma_0(N)=\left\{\begin{pmatrix}a&b\\c&d\end{pmatrix}\in SL_2(\mathbb Z):c\equiv0\pmod N\right\}.
$$