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gp:[N,k,chi] = [936,2,Mod(205,936)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
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sage:from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(936, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([0, 3, 4, 5]))
N = Newforms(chi, 2, names="a")
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magma://Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("936.205");
S:= CuspForms(chi, 2);
N := Newforms(S);
Newform invariants
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sage:traces = [4,4]
f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(2)] == traces)
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gp:f = lf[1] \\ Warning: the index may be different
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sage:f.q_expansion() # note that sage often uses an isomorphic number field
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gp:mfcoefs(f, 20)
Coefficients of the \(q\)-expansion are expressed in terms of a primitive root of unity \(\zeta_{12}\).
We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/936\mathbb{Z}\right)^\times\).
| \(n\) |
\(145\) |
\(209\) |
\(469\) |
\(703\) |
| \(\chi(n)\) |
\(1 - \zeta_{12}^{2}\) |
\(-\zeta_{12}^{2}\) |
\(-1\) |
\(1\) |
For each embedding \(\iota_m\) of the coefficient field, the values \(\iota_m(a_n)\) are shown below.
For more information on an embedded modular form you can click on its label.
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gp:mfembed(f)
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{4} + 4T_{5}^{3} + 15T_{5}^{2} + 4T_{5} + 1 \)
acting on \(S_{2}^{\mathrm{new}}(936, [\chi])\).
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| $p$ |
$F_p(T)$ |
| $2$ |
\( (T^{2} - 2 T + 2)^{2} \)
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|
| $3$ |
\( (T^{2} - 3)^{2} \)
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|
| $5$ |
\( T^{4} + 4 T^{3} + \cdots + 1 \)
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|
| $7$ |
\( (T^{2} - 3 T + 3)^{2} \)
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|
| $11$ |
\( (T^{2} + 4 T - 8)^{2} \)
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|
| $13$ |
\( T^{4} - 22T^{2} + 169 \)
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|
| $17$ |
\( T^{4} + 6 T^{3} + \cdots + 9 \)
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|
| $19$ |
\( T^{4} + 27T^{2} + 729 \)
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|
| $23$ |
\( T^{4} + 6 T^{3} + \cdots + 9 \)
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|
| $29$ |
\( T^{4} \)
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|
| $31$ |
\( (T^{2} - 3 T + 3)^{2} \)
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|
| $37$ |
\( T^{4} - 12 T^{3} + \cdots + 1089 \)
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| $41$ |
\( T^{4} - 6 T^{3} + \cdots + 169 \)
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| $43$ |
\( T^{4} + 12 T^{3} + \cdots + 9 \)
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| $47$ |
\( T^{4} + 6 T^{3} + \cdots + 9409 \)
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|
| $53$ |
\( T^{4} \)
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| $59$ |
\( (T^{2} + 8 T + 4)^{2} \)
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| $61$ |
\( T^{4} + 36 T^{3} + \cdots + 11449 \)
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| $67$ |
\( T^{4} - 12 T^{3} + \cdots + 1089 \)
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|
| $71$ |
\( T^{4} - 18 T^{3} + \cdots + 1369 \)
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| $73$ |
\( T^{4} + 312 T^{2} + 17424 \)
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|
| $79$ |
\( T^{4} + 18 T^{3} + \cdots + 1089 \)
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|
| $83$ |
\( T^{4} - 4 T^{3} + \cdots + 20449 \)
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|
| $89$ |
\( T^{4} - 30 T^{3} + \cdots + 121 \)
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| $97$ |
\( T^{4} + 30 T^{3} + \cdots + 1521 \)
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