Atlas › Modular forms › Weight 4 › Level 35 › 35.4.a

Newspace 35.4.a: $S_{4}^{\mathrm{new}}(\Gamma_0(35))$

Newforms

Label	Dim	Coefficient field	Trace form	AL signs	Sign
35.4.a.a	1	$\mathbb{Q}$	$q + q^{2} - 8q^{3} - 7q^{4} - 5q^{5} - 8q^{6} + 7q^{7} + O(q^{8})$	+ −	$-1$
35.4.a.b	2	$\mathbb{Q}(\sqrt{2})$	$2q + 8q^{2} + 2q^{3} + 20q^{4} - 10q^{5} - 8q^{6} - 14q^{7} + O(q^{8})$	+ +	$+1$
35.4.a.c	3	degree 3	$3q - 3q^{2} + 2q^{3} + 13q^{4} + 15q^{5} + 24q^{6} + 21q^{7} + O(q^{8})$	− −	$+1$

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 $T$
35.4.a.a	$x + 7$
35.4.a.b	$x^{2} - 10x + 7$
35.4.a.c	$x^{3} + x^{2} - 123x + 433$

Dimensions

Newforms $S_{4}^{\mathrm{new}}(\Gamma_0(35))$	6
Old forms	4
Cusp forms $S_{4}(\Gamma_0(35))$	10
Eisenstein series $E_{4}(\Gamma_0(35))$	4
Modular forms $M_{4}(\Gamma_0(35))$	14

Decomposition of the old subspace

$S_{4}^{\mathrm{old}}(\Gamma_0(35)) =$ $S_{4}^{\mathrm{new}}(\Gamma_0(5))^{\oplus 2}$ $\oplus$ $S_{4}^{\mathrm{new}}(\Gamma_0(7))^{\oplus 2}$

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.096 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, 5, 7, 35]: [1, 3, 3, 14] (certified at ell = 2147483629)
T = [(2, 1), (3, 1)]; h of degree 6 = 1 x 6 (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(35, 4)

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

cargo run --release -p sagebrush-web --example atlas -- 35:4 1000

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