# Properties

 Label 819.2.a.c Level $819$ Weight $2$ Character orbit 819.a Self dual yes Analytic conductor $6.540$ Analytic rank $0$ Dimension $1$ CM no Inner twists $1$

# Related objects

Show commands: Magma / PariGP / SageMath

## Newspace parameters

comment: Compute space of new eigenforms

[N,k,chi] = [819,2,Mod(1,819)]

mf = mfinit([N,k,chi],0)

lf = mfeigenbasis(mf)

from sage.modular.dirichlet import DirichletCharacter

H = DirichletGroup(819, base_ring=CyclotomicField(2))

chi = DirichletCharacter(H, H._module([0, 0, 0]))

N = Newforms(chi, 2, names="a")

//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code

chi := DirichletCharacter("819.1");

S:= CuspForms(chi, 2);

N := Newforms(S);

 Level: $$N$$ $$=$$ $$819 = 3^{2} \cdot 7 \cdot 13$$ Weight: $$k$$ $$=$$ $$2$$ Character orbit: $$[\chi]$$ $$=$$ 819.a (trivial)

## Newform invariants

comment: select newform

sage: f = N[0] # Warning: the index may be different

gp: f = lf[1] \\ Warning: the index may be different

 Self dual: yes Analytic conductor: $$6.53974792554$$ Analytic rank: $$0$$ Dimension: $$1$$ Coefficient field: $$\mathbb{Q}$$ Coefficient ring: $$\mathbb{Z}$$ Coefficient ring index: $$1$$ Twist minimal: no (minimal twist has level 91) Fricke sign: $$-1$$ Sato-Tate group: $\mathrm{SU}(2)$

## $q$-expansion

comment: q-expansion

sage: f.q_expansion() # note that sage often uses an isomorphic number field

gp: mfcoefs(f, 20)

 $$f(q)$$ $$=$$ $$q - 2 q^{4} + 3 q^{5} + q^{7}+O(q^{10})$$ q - 2 * q^4 + 3 * q^5 + q^7 $$q - 2 q^{4} + 3 q^{5} + q^{7} + q^{13} + 4 q^{16} + 6 q^{17} - 7 q^{19} - 6 q^{20} - 3 q^{23} + 4 q^{25} - 2 q^{28} + 9 q^{29} + 5 q^{31} + 3 q^{35} + 2 q^{37} + 6 q^{41} - q^{43} - 3 q^{47} + q^{49} - 2 q^{52} + 9 q^{53} - 10 q^{61} - 8 q^{64} + 3 q^{65} + 14 q^{67} - 12 q^{68} + 6 q^{71} + 11 q^{73} + 14 q^{76} - q^{79} + 12 q^{80} - 3 q^{83} + 18 q^{85} - 15 q^{89} + q^{91} + 6 q^{92} - 21 q^{95} - q^{97}+O(q^{100})$$ q - 2 * q^4 + 3 * q^5 + q^7 + q^13 + 4 * q^16 + 6 * q^17 - 7 * q^19 - 6 * q^20 - 3 * q^23 + 4 * q^25 - 2 * q^28 + 9 * q^29 + 5 * q^31 + 3 * q^35 + 2 * q^37 + 6 * q^41 - q^43 - 3 * q^47 + q^49 - 2 * q^52 + 9 * q^53 - 10 * q^61 - 8 * q^64 + 3 * q^65 + 14 * q^67 - 12 * q^68 + 6 * q^71 + 11 * q^73 + 14 * q^76 - q^79 + 12 * q^80 - 3 * q^83 + 18 * q^85 - 15 * q^89 + q^91 + 6 * q^92 - 21 * q^95 - q^97

## Embeddings

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.

comment: embeddings in the coefficient field

gp: mfembed(f)

Label   $$\iota_m(\nu)$$ $$a_{2}$$ $$a_{3}$$ $$a_{4}$$ $$a_{5}$$ $$a_{6}$$ $$a_{7}$$ $$a_{8}$$ $$a_{9}$$ $$a_{10}$$
1.1
 0
0 0 −2.00000 3.00000 0 1.00000 0 0 0
 $$n$$: e.g. 2-40 or 990-1000 Significant digits: Format: Complex embeddings Normalized embeddings Satake parameters Satake angles

## Atkin-Lehner signs

$$p$$ Sign
$$3$$ $$-1$$
$$7$$ $$-1$$
$$13$$ $$-1$$

## Inner twists

This newform does not admit any (nontrivial) inner twists.

## Twists

By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 819.2.a.c 1
3.b odd 2 1 91.2.a.b 1
7.b odd 2 1 5733.2.a.f 1
12.b even 2 1 1456.2.a.k 1
15.d odd 2 1 2275.2.a.d 1
21.c even 2 1 637.2.a.b 1
21.g even 6 2 637.2.e.b 2
21.h odd 6 2 637.2.e.c 2
24.f even 2 1 5824.2.a.f 1
24.h odd 2 1 5824.2.a.bd 1
39.d odd 2 1 1183.2.a.a 1
39.f even 4 2 1183.2.c.a 2
273.g even 2 1 8281.2.a.h 1

By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
91.2.a.b 1 3.b odd 2 1
637.2.a.b 1 21.c even 2 1
637.2.e.b 2 21.g even 6 2
637.2.e.c 2 21.h odd 6 2
819.2.a.c 1 1.a even 1 1 trivial
1183.2.a.a 1 39.d odd 2 1
1183.2.c.a 2 39.f even 4 2
1456.2.a.k 1 12.b even 2 1
2275.2.a.d 1 15.d odd 2 1
5733.2.a.f 1 7.b odd 2 1
5824.2.a.f 1 24.f even 2 1
5824.2.a.bd 1 24.h odd 2 1
8281.2.a.h 1 273.g even 2 1

## Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on $$S_{2}^{\mathrm{new}}(\Gamma_0(819))$$:

 $$T_{2}$$ T2 $$T_{5} - 3$$ T5 - 3

## Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ $$T$$
$3$ $$T$$
$5$ $$T - 3$$
$7$ $$T - 1$$
$11$ $$T$$
$13$ $$T - 1$$
$17$ $$T - 6$$
$19$ $$T + 7$$
$23$ $$T + 3$$
$29$ $$T - 9$$
$31$ $$T - 5$$
$37$ $$T - 2$$
$41$ $$T - 6$$
$43$ $$T + 1$$
$47$ $$T + 3$$
$53$ $$T - 9$$
$59$ $$T$$
$61$ $$T + 10$$
$67$ $$T - 14$$
$71$ $$T - 6$$
$73$ $$T - 11$$
$79$ $$T + 1$$
$83$ $$T + 3$$
$89$ $$T + 15$$
$97$ $$T + 1$$