Atlas › Modular forms › Weight 2 › Level 93 › 93.2.a

Newspace 93.2.a: $S_{2}^{\mathrm{new}}(\Gamma_0(93))$

Newforms

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

Hecke characteristic polynomials

The eigenvalue of $T = T_{2} + T_{5}$ 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 $T$
93.2.a.a	$x^{2} + 7x + 11$
93.2.a.b	$x^{3} + 2x^{2} - 4x - 7$

Dimensions

Newforms $S_{2}^{\mathrm{new}}(\Gamma_0(93))$	5
Old forms	4
Cusp forms $S_{2}(\Gamma_0(93))$	9
Eisenstein series $E_{2}(\Gamma_0(93))$	3
Modular forms $M_{2}(\Gamma_0(93))$	12

Decomposition of the old subspace

$S_{2}^{\mathrm{old}}(\Gamma_0(93)) =$ $S_{2}^{\mathrm{new}}(\Gamma_0(31))^{\oplus 2}$

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.17 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, 3, 31, 93]: [0, 1, 3, 12] (certified at ell = 2147482951)
T = [(2, 1), (5, 1)]; h of degree 5 = 1 x 5 (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(93, 2)

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

cargo run --release -p sagebrush-web --example atlas -- 93:2 1000

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