Invariants
| Level: | $56$ | $\SL_2$-level: | $8$ | ||||
| Index: | $96$ | $\PSL_2$-index: | $48$ | ||||
| Genus: | $0 = 1 + \frac{ 48 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 10 }{2}$ | ||||||
| Cusps: | $10$ (of which $4$ are rational) | Cusp widths | $2^{4}\cdot4^{2}\cdot8^{4}$ | Cusp orbits | $1^{4}\cdot2\cdot4$ | ||
| Elliptic points: | $0$ of order $2$ and $0$ of order $3$ | ||||||
| $\Q$-gonality: | $1$ | ||||||
| $\overline{\Q}$-gonality: | $1$ | ||||||
| Rational cusps: | $4$ | ||||||
| Rational CM points: | none |
Other labels
| Cummins and Pauli (CP) label: | 8O0 |
| Rouse, Sutherland, and Zureick-Brown (RSZB) label: | 56.96.0.530 |
Level structure
| $\GL_2(\Z/56\Z)$-generators: | $\begin{bmatrix}11&30\\44&21\end{bmatrix}$, $\begin{bmatrix}33&24\\36&53\end{bmatrix}$, $\begin{bmatrix}35&18\\26&43\end{bmatrix}$, $\begin{bmatrix}45&18\\40&39\end{bmatrix}$ |
| Contains $-I$: | no $\quad$ (see 8.48.0.k.2 for the level structure with $-I$) |
| Cyclic 56-isogeny field degree: | $8$ |
| Cyclic 56-torsion field degree: | $192$ |
| Full 56-torsion field degree: | $32256$ |
Models
This modular curve is isomorphic to $\mathbb{P}^1$.
Rational points
This modular curve has infinitely many rational points, including 14 stored non-cuspidal points.
Maps to other modular curves
$j$-invariant map of degree 48 to the modular curve $X(1)$ :
| $\displaystyle j$ | $=$ | $\displaystyle 2^2\,\frac{x^{48}(x^{16}+60x^{12}y^{4}+134x^{8}y^{8}+60x^{4}y^{12}+y^{16})^{3}}{y^{4}x^{52}(x-y)^{8}(x+y)^{8}(x^{2}+y^{2})^{8}(x^{4}+y^{4})^{2}}$ |
Modular covers
This modular curve minimally covers the modular curves listed below.
| Covered curve | Level | Index | Degree | Genus | Rank |
|---|---|---|---|---|---|
| 56.48.0-8.d.1.7 | $56$ | $2$ | $2$ | $0$ | $0$ |
| 56.48.0-8.d.1.14 | $56$ | $2$ | $2$ | $0$ | $0$ |
| 56.48.0-8.e.2.10 | $56$ | $2$ | $2$ | $0$ | $0$ |
| 56.48.0-8.e.2.15 | $56$ | $2$ | $2$ | $0$ | $0$ |
| 56.48.0-8.i.1.2 | $56$ | $2$ | $2$ | $0$ | $0$ |
| 56.48.0-8.i.1.6 | $56$ | $2$ | $2$ | $0$ | $0$ |
This modular curve is minimally covered by the modular curves in the database listed below.