A subgroup of $\Sp(2g,\Q)$ is called a congruence subgroup of level $N$ if it contains the principal congruence subgroup $\Gamma(N)$.
Examples of such subgroups are:
- the principal congruence subgroup $\Gamma(N)$;
- Hecke (or Siegel parabolic) subgroup $\Gamma_0(N)$;
- the subgroup $\Gamma_1(N)$.
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- Last edited by Fabien Cléry on 2023-11-30 17:09:32
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