Invariants
| Level: | $56$ | $\SL_2$-level: | $56$ | Newform level: | $392$ | ||
| Index: | $672$ | $\PSL_2$-index: | $336$ | ||||
| Genus: | $21 = 1 + \frac{ 336 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 16 }{2}$ | ||||||
| Cusps: | $16$ (of which $4$ are rational) | Cusp widths | $14^{8}\cdot28^{8}$ | Cusp orbits | $1^{4}\cdot3^{2}\cdot6$ | ||
| Elliptic points: | $0$ of order $2$ and $0$ of order $3$ | ||||||
| Analytic rank: | $3$ | ||||||
| $\Q$-gonality: | $6 \le \gamma \le 12$ | ||||||
| $\overline{\Q}$-gonality: | $6 \le \gamma \le 12$ | ||||||
| Rational cusps: | $4$ | ||||||
| Rational CM points: | none |
Other labels
| Cummins and Pauli (CP) label: | 28B21 |
| Rouse, Sutherland, and Zureick-Brown (RSZB) label: | 56.672.21.773 |
Level structure
| $\GL_2(\Z/56\Z)$-generators: | $\begin{bmatrix}1&21\\40&13\end{bmatrix}$, $\begin{bmatrix}3&15\\28&11\end{bmatrix}$, $\begin{bmatrix}29&25\\36&41\end{bmatrix}$, $\begin{bmatrix}45&26\\12&7\end{bmatrix}$, $\begin{bmatrix}55&28\\0&27\end{bmatrix}$ |
| Contains $-I$: | no $\quad$ (see 28.336.21.bb.1 for the level structure with $-I$) |
| Cyclic 56-isogeny field degree: | $4$ |
| Cyclic 56-torsion field degree: | $96$ |
| Full 56-torsion field degree: | $4608$ |
Jacobian
| Conductor: | $2^{40}\cdot7^{37}$ |
| Simple: | no |
| Squarefree: | no |
| Decomposition: | $1^{13}\cdot2^{4}$ |
| Newforms: | 14.2.a.a$^{3}$, 49.2.a.a, 56.2.a.a, 56.2.a.b, 98.2.a.a, 98.2.a.b$^{2}$, 196.2.a.a, 196.2.a.b, 196.2.a.c, 392.2.a.a, 392.2.a.b, 392.2.a.d, 392.2.a.e, 392.2.a.h |
Rational points
This modular curve has 4 rational cusps but no known non-cuspidal rational points.
Modular covers
This modular curve minimally covers the modular curves listed below.
| Covered curve | Level | Index | Degree | Genus | Rank | Kernel decomposition |
|---|---|---|---|---|---|---|
| 56.336.9-28.c.1.2 | $56$ | $2$ | $2$ | $9$ | $0$ | $1^{10}\cdot2$ |
| 56.336.9-28.c.1.18 | $56$ | $2$ | $2$ | $9$ | $0$ | $1^{10}\cdot2$ |
This modular curve is minimally covered by the modular curves in the database listed below.
| Covering curve | Level | Index | Degree | Genus | Rank | Kernel decomposition |
|---|---|---|---|---|---|---|
| 56.1344.41-28.b.1.28 | $56$ | $2$ | $2$ | $41$ | $5$ | $1^{14}\cdot2^{3}$ |
| 56.1344.41-28.bf.1.10 | $56$ | $2$ | $2$ | $41$ | $14$ | $1^{14}\cdot2^{3}$ |
| 56.1344.41-28.bt.1.8 | $56$ | $2$ | $2$ | $41$ | $6$ | $1^{14}\cdot2^{3}$ |
| 56.1344.41-28.bv.1.6 | $56$ | $2$ | $2$ | $41$ | $12$ | $1^{14}\cdot2^{3}$ |
| 56.1344.41-56.cl.1.7 | $56$ | $2$ | $2$ | $41$ | $10$ | $1^{14}\cdot2^{3}$ |
| 56.1344.41-56.in.1.7 | $56$ | $2$ | $2$ | $41$ | $13$ | $1^{14}\cdot2^{3}$ |
| 56.1344.41-56.mf.1.8 | $56$ | $2$ | $2$ | $41$ | $14$ | $1^{14}\cdot2^{3}$ |
| 56.1344.41-56.mt.1.8 | $56$ | $2$ | $2$ | $41$ | $10$ | $1^{14}\cdot2^{3}$ |
| 56.1344.45-56.ik.1.12 | $56$ | $2$ | $2$ | $45$ | $5$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.ik.1.16 | $56$ | $2$ | $2$ | $45$ | $5$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.il.1.20 | $56$ | $2$ | $2$ | $45$ | $8$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.il.1.24 | $56$ | $2$ | $2$ | $45$ | $8$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.is.1.10 | $56$ | $2$ | $2$ | $45$ | $13$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.is.1.12 | $56$ | $2$ | $2$ | $45$ | $13$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.it.1.11 | $56$ | $2$ | $2$ | $45$ | $11$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.it.1.12 | $56$ | $2$ | $2$ | $45$ | $11$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.je.1.14 | $56$ | $2$ | $2$ | $45$ | $9$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.je.1.18 | $56$ | $2$ | $2$ | $45$ | $9$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.jf.1.10 | $56$ | $2$ | $2$ | $45$ | $16$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.jf.1.14 | $56$ | $2$ | $2$ | $45$ | $16$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.ji.1.14 | $56$ | $2$ | $2$ | $45$ | $11$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.ji.1.16 | $56$ | $2$ | $2$ | $45$ | $11$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.jj.1.15 | $56$ | $2$ | $2$ | $45$ | $23$ | $1^{16}\cdot2^{4}$ |
| 56.1344.45-56.jj.1.16 | $56$ | $2$ | $2$ | $45$ | $23$ | $1^{16}\cdot2^{4}$ |
| 56.2016.61-28.bf.1.3 | $56$ | $3$ | $3$ | $61$ | $9$ | $1^{26}\cdot2^{7}$ |