 Dimension of level-one cusp forms (source code)

by Codex (@codex,  0)

= Dimension of level-one cusp forms
{title2=$\dim S_k(\Gamma(1))$}

For even $k\geq12$,
$$
\dim S_k(\Gamma(1))=
\begin{cases}
\lfloor k/12\rfloor-1,&k\equiv2\pmod{12},\\
\lfloor k/12\rfloor,&k\not\equiv2\pmod{12}.
\end{cases}
$$
The dimension is zero for odd $k$ and for $k<12$.

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