gp: [N,k,chi] = [1080,1,Mod(269,1080)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
sage: from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1080, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 1, 1, 1]))
N = Newforms(chi, 1, names="a")
magma: //Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("1080.269");
S:= CuspForms(chi, 1);
N := Newforms(S);
Newform invariants
sage: traces = [1,-1,0,1,1]
f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(5)] == traces)
gp: f = lf[1] \\ Warning: the index may be different
sage: f.q_expansion() # note that sage often uses an isomorphic number field
gp: mfcoefs(f, 20)
Character values
We give the values of χ \chi χ on generators for ( Z / 1080 Z ) × \left(\mathbb{Z}/1080\mathbb{Z}\right)^\times ( Z / 1 0 8 0 Z ) × .
n n n
217 217 2 1 7
271 271 2 7 1
541 541 5 4 1
1001 1001 1 0 0 1
χ ( n ) \chi(n) χ ( n )
− 1 -1 − 1
1 1 1
− 1 -1 − 1
− 1 -1 − 1
For each embedding ι m \iota_m ι m of the coefficient field, the values ι m ( a n ) \iota_m(a_n) ι m ( a n ) are shown below.
For more information on an embedded modular form you can click on its label.
gp: mfembed(f)
Refresh table
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on S 1 n e w ( 1080 , [ χ ] ) S_{1}^{\mathrm{new}}(1080, [\chi]) S 1 n e w ( 1 0 8 0 , [ χ ] ) :
T 7 T_{7} T 7
T7
T 11 + 1 T_{11} + 1 T 1 1 + 1
T11 + 1
T 13 − 1 T_{13} - 1 T 1 3 − 1
T13 - 1
p p p
F p ( T ) F_p(T) F p ( T )
2 2 2
T + 1 T + 1 T + 1
T + 1
3 3 3
T T T
T
5 5 5
T − 1 T - 1 T − 1
T - 1
7 7 7
T T T
T
11 11 1 1
T + 1 T + 1 T + 1
T + 1
13 13 1 3
T − 1 T - 1 T − 1
T - 1
17 17 1 7
T − 1 T - 1 T − 1
T - 1
19 19 1 9
T T T
T
23 23 2 3
T − 1 T - 1 T − 1
T - 1
29 29 2 9
T + 1 T + 1 T + 1
T + 1
31 31 3 1
T + 1 T + 1 T + 1
T + 1
37 37 3 7
T + 2 T + 2 T + 2
T + 2
41 41 4 1
T T T
T
43 43 4 3
T − 1 T - 1 T − 1
T - 1
47 47 4 7
T − 1 T - 1 T − 1
T - 1
53 53 5 3
T T T
T
59 59 5 9
T − 2 T - 2 T − 2
T - 2
61 61 6 1
T T T
T
67 67 6 7
T + 2 T + 2 T + 2
T + 2
71 71 7 1
T T T
T
73 73 7 3
T T T
T
79 79 7 9
T + 1 T + 1 T + 1
T + 1
83 83 8 3
T T T
T
89 89 8 9
T T T
T
97 97 9 7
T T T
T
show more
show less