Atlas › Modular forms › Weight 2 › Level 127 › 127.2.a

Newspace 127.2.a: $S_{2}^{\mathrm{new}}(\Gamma_0(127))$

Newforms

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

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 $T$
127.2.a.a	$x^{3} + 6x^{2} + 9x + 3$
127.2.a.b	$x^{7} - 5x^{6} - 8x^{5} + 67x^{4} - 83x^{3} - 2x^{2} + 28x - 7$

Dimensions

Newforms $S_{2}^{\mathrm{new}}(\Gamma_0(127))$	10
Old forms	0
Cusp forms $S_{2}(\Gamma_0(127))$	10
Eisenstein series $E_{2}(\Gamma_0(127))$	1
Modular forms $M_{2}(\Gamma_0(127))$	11

Decomposition of the old subspace

The old subspace is 0.

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.16 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, 127]: [0, 11] (certified at ell = 2147483647)
T = [(2, 1), (3, 1)]; h of degree 10 = 1 x 10 (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(127, 2)

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

cargo run --release -p sagebrush-web --example atlas -- 127:2 1000

← 126.2.a · 128.2.a →