Atlas › Modular forms › Weight 2 › Level 118 › 118.2.a

Newspace 118.2.a: $S_{2}^{\mathrm{new}}(\Gamma_0(118))$

Newforms

Label	Dim	Coefficient field	Trace form	AL signs	Sign	Elliptic curve
118.2.a.a	1	$\mathbb{Q}$	$q - q^{2} - q^{3} + q^{4} - 3q^{5} + q^{6} - q^{7} + O(q^{8})$	+ +	$-1$	118a1 rank 1
118.2.a.b	1	$\mathbb{Q}$	$q - q^{2} + 2q^{3} + q^{4} + 2q^{5} - 2q^{6} - 3q^{7} + O(q^{8})$	+ −	$+1$	118d1 rank 0
118.2.a.c	1	$\mathbb{Q}$	$q + q^{2} - q^{3} + q^{4} + q^{5} - q^{6} + 3q^{7} + O(q^{8})$	− +	$+1$	118b1 rank 0
118.2.a.d	1	$\mathbb{Q}$	$q + q^{2} + 2q^{3} + q^{4} - 2q^{5} + 2q^{6} - 3q^{7} + O(q^{8})$	− +	$+1$	118c1 rank 0

Hecke characteristic polynomials

The eigenvalue of $T = T_{3} + 3T_{5}$ 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 $T$
118.2.a.a	$x + 10$
118.2.a.b	$x - 8$
118.2.a.c	$x - 2$
118.2.a.d	$x + 4$

Dimensions

Newforms $S_{2}^{\mathrm{new}}(\Gamma_0(118))$	4
Old forms	10
Cusp forms $S_{2}(\Gamma_0(118))$	14
Eisenstein series $E_{2}(\Gamma_0(118))$	3
Modular forms $M_{2}(\Gamma_0(118))$	17

Decomposition of the old subspace

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

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.192 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, 59, 118]: [0, 1, 6, 17] (certified at ell = 2147482481)
T = [(3, 1), (5, 3)]; 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(118, 2)

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

cargo run --release -p sagebrush-web --example atlas -- 118:2 1000

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