Atlas › Modular forms › Weight 2 › Level 47 › 47.2.a

Newspace 47.2.a: $S_{2}^{\mathrm{new}}(\Gamma_0(47))$

Newforms

Label	Dim	Coefficient field	Trace form	AL signs	Sign	CM	Elliptic curve
47.2.a.a	4	degree 4	$4q + q^{2} + 3q^{4} - 2q^{5} - 8q^{6} + 4q^{7} + O(q^{8})$	−	$+1$

Hecke characteristic polynomials

The eigenvalue of $T = T_{2} + T_{3}$ generates each orbit's coefficient field; on the newspace its characteristic polynomial factors over $\mathbb{Q}$ as one irreducible factor per orbit:

Orbit	Characteristic polynomial of $T$
47.2.a.a	$x^{4} - x^{3} - 4x^{2} + 1$

Dimensions

Newforms $S_{2}^{\mathrm{new}}(\Gamma_0(47))$	4
Old forms	0
Cusp forms $S_{2}(\Gamma_0(47))$	4
Eisenstein series $E_{2}(\Gamma_0(47))$	1
Modular forms $M_{2}(\Gamma_0(47))$	5

Decomposition of the old subspace

The old subspace is 0.

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.075 s (one thread) and proven: the dimensions are certified, and the characteristic polynomial of $T$ over $\mathbb{Z}$ is reconstructed by CRT past a rigorous coefficient bound.

The engine's checks

dim M^+ at levels [1, 47]: [0, 5] (certified at ell = 2147483137)
T = [(2, 1), (3, 1)]; h of degree 4 = 1 x 4 (phi(ord eps) x dim S_k^new); 1 primes, 0 rejected

Open in the notebook · JSON · stored data

Recompute it yourself

In Sage mode at sagebrush.space (or npx sagebrush --sage):

newform_orbits(47, 2)

With the Rust engine (source), in engine/:

cargo run --release -p sagebrush-web --example atlas -- 47:2 1000

← 46.2.a · 48.2.a →