Properties

Label 756.2.ca
Level 756
Weight 2
Character orbit ca
Rep. character \(\chi_{756}(173,\cdot)\)
Character field \(\Q(\zeta_{18})\)
Dimension 144
Newform subspaces 1
Sturm bound 288
Trace bound 0

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Defining parameters

Level: \( N \) = \( 756 = 2^{2} \cdot 3^{3} \cdot 7 \)
Weight: \( k \) = \( 2 \)
Character orbit: \([\chi]\) = 756.ca (of order \(18\) and degree \(6\))
Character conductor: \(\operatorname{cond}(\chi)\) = \( 189 \)
Character field: \(\Q(\zeta_{18})\)
Newform subspaces: \( 1 \)
Sturm bound: \(288\)
Trace bound: \(0\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{2}(756, [\chi])\).

Total New Old
Modular forms 900 144 756
Cusp forms 828 144 684
Eisenstein series 72 0 72

Trace form

\( 144q - 12q^{9} + O(q^{10}) \) \( 144q - 12q^{9} + 12q^{11} + 12q^{15} - 3q^{21} - 15q^{23} - 6q^{29} - 42q^{39} + 18q^{45} - 54q^{47} - 36q^{49} + 18q^{51} + 45q^{53} + 3q^{57} + 54q^{61} + 39q^{63} - 3q^{65} + 36q^{69} + 36q^{71} + 93q^{77} - 18q^{79} - 36q^{81} + 36q^{85} - 18q^{91} + 60q^{93} + 6q^{95} + O(q^{100}) \)

Decomposition of \(S_{2}^{\mathrm{new}}(756, [\chi])\) into newform subspaces

Label Dim. \(A\) Field CM Traces $q$-expansion
\(a_2\) \(a_3\) \(a_5\) \(a_7\)
756.2.ca.a \(144\) \(6.037\) None \(0\) \(0\) \(0\) \(0\)

Decomposition of \(S_{2}^{\mathrm{old}}(756, [\chi])\) into lower level spaces

\( S_{2}^{\mathrm{old}}(756, [\chi]) \cong \) \(S_{2}^{\mathrm{new}}(189, [\chi])\)\(^{\oplus 3}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(378, [\chi])\)\(^{\oplus 2}\)

Hecke Characteristic Polynomials

There are no characteristic polynomials of Hecke operators in the database