Properties

Label 56.2
Level 56
Weight 2
Dimension 42
Nonzero newspaces 6
Newforms 10
Sturm bound 384
Trace bound 2

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Defining parameters

Level: \( N \) = \( 56 = 2^{3} \cdot 7 \)
Weight: \( k \) = \( 2 \)
Nonzero newspaces: \( 6 \)
Newforms: \( 10 \)
Sturm bound: \(384\)
Trace bound: \(2\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{2}(\Gamma_1(56))\).

Total New Old
Modular forms 132 62 70
Cusp forms 61 42 19
Eisenstein series 71 20 51

Trace form

\( 42q - 6q^{2} - 6q^{3} - 6q^{4} - 6q^{6} - 6q^{7} - 12q^{8} - 18q^{9} + O(q^{10}) \) \( 42q - 6q^{2} - 6q^{3} - 6q^{4} - 6q^{6} - 6q^{7} - 12q^{8} - 18q^{9} - 6q^{10} - 12q^{11} - 6q^{12} - 6q^{13} - 6q^{14} - 24q^{15} - 6q^{16} - 18q^{17} + 12q^{18} - 6q^{19} + 12q^{20} + 18q^{22} + 12q^{23} + 30q^{24} + 6q^{25} + 24q^{26} + 24q^{27} + 42q^{28} + 42q^{30} + 12q^{31} + 24q^{32} - 6q^{33} + 30q^{34} - 6q^{35} + 18q^{36} - 6q^{37} + 12q^{38} + 24q^{40} - 36q^{41} - 42q^{42} - 12q^{43} - 30q^{44} - 6q^{45} - 36q^{46} + 12q^{47} - 66q^{48} - 6q^{49} - 54q^{50} + 36q^{51} - 60q^{52} + 6q^{53} - 78q^{54} + 24q^{55} - 48q^{56} - 36q^{58} + 30q^{59} - 72q^{60} - 60q^{62} + 30q^{63} - 54q^{64} - 12q^{65} - 30q^{66} + 12q^{67} - 6q^{68} + 12q^{69} + 18q^{70} + 24q^{71} + 12q^{72} - 30q^{73} + 78q^{74} + 54q^{75} + 66q^{76} + 18q^{77} + 72q^{78} + 12q^{79} + 108q^{80} + 12q^{81} + 66q^{82} + 30q^{83} + 102q^{84} + 102q^{86} + 36q^{87} + 66q^{88} - 6q^{89} + 72q^{90} - 18q^{91} + 66q^{92} + 6q^{93} + 30q^{94} - 12q^{95} + 18q^{96} + 36q^{97} + 18q^{98} - 84q^{99} + O(q^{100}) \)

Decomposition of \(S_{2}^{\mathrm{new}}(\Gamma_1(56))\)

We only show spaces with even parity, since no modular forms exist when this condition is not satisfied. Within each space \( S_k^{\mathrm{new}}(N, \chi) \) we list the newforms together with their dimension.

Label \(\chi\) Newforms Dimension \(\chi\) degree
56.2.a \(\chi_{56}(1, \cdot)\) 56.2.a.a 1 1
56.2.a.b 1
56.2.b \(\chi_{56}(29, \cdot)\) 56.2.b.a 2 1
56.2.b.b 4
56.2.e \(\chi_{56}(27, \cdot)\) 56.2.e.a 2 1
56.2.e.b 4
56.2.f \(\chi_{56}(55, \cdot)\) None 0 1
56.2.i \(\chi_{56}(9, \cdot)\) 56.2.i.a 2 2
56.2.i.b 2
56.2.l \(\chi_{56}(31, \cdot)\) None 0 2
56.2.m \(\chi_{56}(3, \cdot)\) 56.2.m.a 12 2
56.2.p \(\chi_{56}(37, \cdot)\) 56.2.p.a 12 2

Decomposition of \(S_{2}^{\mathrm{old}}(\Gamma_1(56))\) into lower level spaces

\( S_{2}^{\mathrm{old}}(\Gamma_1(56)) \cong \) \(S_{2}^{\mathrm{new}}(\Gamma_1(14))\)\(^{\oplus 3}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_1(28))\)\(^{\oplus 2}\)