Atlas › Modular forms › Weight 4 › Level 17 › 17.4.a

Newspace 17.4.a: $S_{4}^{\mathrm{new}}(\Gamma_0(17))$

Newforms

Label	Dim	Coefficient field	Trace form	AL signs	Sign	CM	Elliptic curve
17.4.a.a	1	$\mathbb{Q}$	$q - 3q^{2} - 8q^{3} + q^{4} + 6q^{5} + 24q^{6} - 28q^{7} + O(q^{8})$	−	$-1$
17.4.a.b	3	degree 3	$3q + q^{2} + 4q^{3} + 25q^{4} - 8q^{5} - 74q^{6} + 22q^{7} + O(q^{8})$	+	$+1$

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 $T$
17.4.a.a	$x + 11$
17.4.a.b	$x^{3} - 5x^{2} - 8x + 46$

Dimensions

Newforms $S_{4}^{\mathrm{new}}(\Gamma_0(17))$	4
Old forms	0
Cusp forms $S_{4}(\Gamma_0(17))$	4
Eisenstein series $E_{4}(\Gamma_0(17))$	2
Modular forms $M_{4}(\Gamma_0(17))$	6

Decomposition of the old subspace

The old subspace is 0.

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.089 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, 17]: [1, 6] (certified at ell = 2147483489)
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(17, 4)

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

cargo run --release -p sagebrush-web --example atlas -- 17:4 1000

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