Defining parameters
Level: | \( N \) | \(=\) | \( 816 = 2^{4} \cdot 3 \cdot 17 \) |
Weight: | \( k \) | \(=\) | \( 2 \) |
Character orbit: | \([\chi]\) | \(=\) | 816.s (of order \(4\) and degree \(2\)) |
Character conductor: | \(\operatorname{cond}(\chi)\) | \(=\) | \( 272 \) |
Character field: | \(\Q(i)\) | ||
Newform subspaces: | \( 4 \) | ||
Sturm bound: | \(288\) | ||
Trace bound: | \(7\) | ||
Distinguishing \(T_p\): | \(5\), \(7\) |
Dimensions
The following table gives the dimensions of various subspaces of \(M_{2}(816, [\chi])\).
Total | New | Old | |
---|---|---|---|
Modular forms | 296 | 144 | 152 |
Cusp forms | 280 | 144 | 136 |
Eisenstein series | 16 | 0 | 16 |
Trace form
Decomposition of \(S_{2}^{\mathrm{new}}(816, [\chi])\) into newform subspaces
Label | Dim | $A$ | Field | CM | Traces | $q$-expansion | |||
---|---|---|---|---|---|---|---|---|---|
$a_{2}$ | $a_{3}$ | $a_{5}$ | $a_{7}$ | ||||||
816.2.s.a | $2$ | $6.516$ | \(\Q(\sqrt{-1}) \) | None | \(2\) | \(2\) | \(0\) | \(-2\) | \(q+(1+i)q^{2}+q^{3}+2iq^{4}+(1+i)q^{6}+\cdots\) |
816.2.s.b | $2$ | $6.516$ | \(\Q(\sqrt{-1}) \) | None | \(2\) | \(2\) | \(0\) | \(6\) | \(q+(1+i)q^{2}+q^{3}+2iq^{4}+(1+i)q^{6}+\cdots\) |
816.2.s.c | $68$ | $6.516$ | None | \(-2\) | \(68\) | \(0\) | \(-4\) | ||
816.2.s.d | $72$ | $6.516$ | None | \(-2\) | \(-72\) | \(0\) | \(0\) |
Decomposition of \(S_{2}^{\mathrm{old}}(816, [\chi])\) into lower level spaces
\( S_{2}^{\mathrm{old}}(816, [\chi]) \cong \) \(S_{2}^{\mathrm{new}}(272, [\chi])\)\(^{\oplus 2}\)