Atlas › Modular forms › Weight 2 › Level 145 › 145.2.a

Newspace 145.2.a: $S_{2}^{\mathrm{new}}(\Gamma_0(145))$

Newforms

Label	Dim	Coefficient field	Trace form	AL signs	Sign	Elliptic curve
145.2.a.a	1	$\mathbb{Q}$	$q - q^{2} - q^{4} - q^{5} - 2q^{7} + O(q^{8})$	+ +	$-1$	145a1 rank 1
145.2.a.b	2	$\mathbb{Q}(\sqrt{2})$	$2q - 2q^{2} - 4q^{3} + 2q^{4} + 2q^{5} + 4q^{6} - 4q^{7} + O(q^{8})$	− −	$-1$
145.2.a.c	3	degree 3	$3q + q^{2} + 2q^{3} + q^{4} + 3q^{5} - 4q^{6} + 4q^{7} + O(q^{8})$	− +	$+1$
145.2.a.d	3	degree 3	$3q + 3q^{2} - 2q^{3} + 5q^{4} - 3q^{5} + 4q^{6} - 2q^{7} + O(q^{8})$	+ −	$+1$

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 $T$
145.2.a.a	$x + 1$
145.2.a.b	$x^{2} + 6x + 7$
145.2.a.c	$x^{3} - 3x^{2} - x + 1$
145.2.a.d	$x^{3} - x^{2} - 15x + 25$

Dimensions

Newforms $S_{2}^{\mathrm{new}}(\Gamma_0(145))$	9
Old forms	4
Cusp forms $S_{2}(\Gamma_0(145))$	13
Eisenstein series $E_{2}(\Gamma_0(145))$	3
Modular forms $M_{2}(\Gamma_0(145))$	16

Decomposition of the old subspace

$S_{2}^{\mathrm{old}}(\Gamma_0(145)) =$ $S_{2}^{\mathrm{new}}(\Gamma_0(29))^{\oplus 2}$

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.258 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, 29, 145]: [0, 1, 3, 16] (certified at ell = 2147483549)
T = [(2, 1), (3, 1)]; h of degree 9 = 1 x 9 (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(145, 2)

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

cargo run --release -p sagebrush-web --example atlas -- 145:2 1000

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