Atlas › Modular forms › Weight 2 › Level 354 › 354.2.a

Newspace 354.2.a: $S_{2}^{\mathrm{new}}(\Gamma_0(354))$

Newforms

Label	Dim	Coefficient field	Trace form	AL signs	Sign	Elliptic curve
354.2.a.a	1	$\mathbb{Q}$	$q - q^{2} - q^{3} + q^{4} + q^{6} - q^{7} + O(q^{8})$	+ + +	$-1$	354c1 rank 1
354.2.a.b	1	$\mathbb{Q}$	$q - q^{2} - q^{3} + q^{4} + 2q^{5} + q^{6} + O(q^{8})$	+ + −	$+1$	354d1 rank 0
354.2.a.c	1	$\mathbb{Q}$	$q - q^{2} + q^{3} + q^{4} - q^{6} - q^{7} + O(q^{8})$	+ − +	$+1$	354b1 rank 0
354.2.a.d	1	$\mathbb{Q}$	$q + q^{2} - q^{3} + q^{4} - 4q^{5} - q^{6} - q^{7} + O(q^{8})$	− + −	$-1$	354f1 rank 1
354.2.a.e	1	$\mathbb{Q}$	$q + q^{2} - q^{3} + q^{4} - q^{6} + O(q^{8})$	− + +	$+1$	354a1 rank 0
354.2.a.f	1	$\mathbb{Q}$	$q + q^{2} - q^{3} + q^{4} + 4q^{5} - q^{6} + O(q^{8})$	− + +	$+1$	354e1 rank 0
354.2.a.g	2	$\mathbb{Q}(\sqrt{11})$	$2q - 2q^{2} + 2q^{3} + 2q^{4} + 2q^{5} - 2q^{6} + 8q^{7} + O(q^{8})$	+ − +	$+1$
354.2.a.h	3	degree 3	$3q + 3q^{2} + 3q^{3} + 3q^{4} + 2q^{5} + 3q^{6} - q^{7} + O(q^{8})$	− − −	$+1$

Hecke characteristic polynomials

The eigenvalue of $T = T_{5} + 3T_{7} + 5T_{11} + 7T_{13} + 9T_{17}$ 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 $T$
354.2.a.a	$x + 12$
354.2.a.b	$x + 2$
354.2.a.c	$x - 20$
354.2.a.d	$x + 92$
354.2.a.e	$x - 102$
354.2.a.f	$x + 34$
354.2.a.g	$x^{2} + 8x - 6320$
354.2.a.h	$x^{3} + 16x^{2} + 24x - 352$

Dimensions

Newforms $S_{2}^{\mathrm{new}}(\Gamma_0(354))$	11
Old forms	46
Cusp forms $S_{2}(\Gamma_0(354))$	57
Eisenstein series $E_{2}(\Gamma_0(354))$	7
Modular forms $M_{2}(\Gamma_0(354))$	64

Decomposition of the old subspace

$S_{2}^{\mathrm{old}}(\Gamma_0(354)) =$ $S_{2}^{\mathrm{new}}(\Gamma_0(59))^{\oplus 4}$ $\oplus$ $S_{2}^{\mathrm{new}}(\Gamma_0(118))^{\oplus 2}$ $\oplus$ $S_{2}^{\mathrm{new}}(\Gamma_0(177))^{\oplus 2}$

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.243 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, 2, 3, 6, 59, 118, 177, 354]: [0, 1, 1, 3, 6, 17, 22, 64] (certified at ell = 2147482481)
T = [(5, 1), (7, 3), (11, 5), (13, 7), (17, 9)]; h of degree 11 = 1 x 11 (phi(ord eps) x dim S_k^new); 3 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(354, 2)

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

cargo run --release -p sagebrush-web --example atlas -- 354:2 1000

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