Invariants
Level: | $56$ | $\SL_2$-level: | $8$ | Newform level: | $32$ | ||
Index: | $48$ | $\PSL_2$-index: | $48$ | ||||
Genus: | $1 = 1 + \frac{ 48 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 8 }{2}$ | ||||||
Cusps: | $8$ (none of which are rational) | Cusp widths | $4^{4}\cdot8^{4}$ | Cusp orbits | $2^{2}\cdot4$ | ||
Elliptic points: | $0$ of order $2$ and $0$ of order $3$ | ||||||
Analytic rank: | $0$ | ||||||
$\Q$-gonality: | $2$ | ||||||
$\overline{\Q}$-gonality: | $2$ | ||||||
Rational cusps: | $0$ | ||||||
Rational CM points: | none |
Other labels
Cummins and Pauli (CP) label: | 8F1 |
Rouse, Sutherland, and Zureick-Brown (RSZB) label: | 56.48.1.306 |
Level structure
$\GL_2(\Z/56\Z)$-generators: | $\begin{bmatrix}27&38\\2&45\end{bmatrix}$, $\begin{bmatrix}39&21\\26&45\end{bmatrix}$, $\begin{bmatrix}45&45\\40&11\end{bmatrix}$ |
Contains $-I$: | yes |
Quadratic refinements: | none in database |
Cyclic 56-isogeny field degree: | $16$ |
Cyclic 56-torsion field degree: | $384$ |
Full 56-torsion field degree: | $64512$ |
Jacobian
Conductor: | $2^{5}$ |
Simple: | yes |
Squarefree: | yes |
Decomposition: | $1$ |
Newforms: | 32.2.a.a |
Models
Embedded model Embedded model in $\mathbb{P}^{3}$
$ 0 $ | $=$ | $ 2 x^{2} - x z - 7 y^{2} + z^{2} $ |
$=$ | $7 x^{2} - 7 x z + 7 y^{2} + 7 z^{2} + w^{2}$ |
Singular plane model Singular plane model
$ 0 $ | $=$ | $ x^{4} + 10 x^{2} y^{2} + 21 x^{2} z^{2} + 81 y^{4} + 252 y^{2} z^{2} + 196 z^{4} $ |
Rational points
This modular curve has no real points, and therefore no rational points.
Maps between models of this curve
Birational map from embedded model to plane model:
$\displaystyle X$ | $=$ | $\displaystyle z$ |
$\displaystyle Y$ | $=$ | $\displaystyle y$ |
$\displaystyle Z$ | $=$ | $\displaystyle \frac{1}{7}w$ |
Maps to other modular curves
$j$-invariant map of degree 48 from the embedded model of this modular curve to the modular curve $X(1)$ :
$\displaystyle j$ | $=$ | $\displaystyle 2^4\cdot3^3\,\frac{204577493120xz^{11}-507798361728xz^{9}w^{2}-26773032384xz^{7}w^{4}+21059958528xz^{5}w^{6}+3130016904xz^{3}w^{8}+248005800xzw^{10}+319862218816z^{12}+326120338880z^{10}w^{2}-117033998256z^{8}w^{4}-35840514528z^{6}w^{6}-1416409092z^{4}w^{8}-35823060z^{2}w^{10}-7381125w^{12}}{51144373280xz^{11}+125905270680xz^{9}w^{2}+56675653020xz^{7}w^{4}+8208542916xz^{5}w^{6}+660981384xz^{3}w^{8}+39680928xzw^{10}+79965554704z^{12}+10989492248z^{10}w^{2}-25725752199z^{8}w^{4}-8604561798z^{6}w^{6}-988721559z^{4}w^{8}-47396664z^{2}w^{10}+944784w^{12}}$ |
Modular covers
Cover information
Click on a modular curve in the diagram to see information about it.
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This modular curve minimally covers the modular curves listed below.
Covered curve | Level | Index | Degree | Genus | Rank | Kernel decomposition |
---|---|---|---|---|---|---|
8.24.1.w.1 | $8$ | $2$ | $2$ | $1$ | $0$ | dimension zero |
28.24.0.h.1 | $28$ | $2$ | $2$ | $0$ | $0$ | full Jacobian |
56.24.0.cb.1 | $56$ | $2$ | $2$ | $0$ | $0$ | full Jacobian |
56.24.0.db.1 | $56$ | $2$ | $2$ | $0$ | $0$ | full Jacobian |
56.24.0.di.1 | $56$ | $2$ | $2$ | $0$ | $0$ | full Jacobian |
56.24.1.be.1 | $56$ | $2$ | $2$ | $1$ | $0$ | dimension zero |
56.24.1.bn.1 | $56$ | $2$ | $2$ | $1$ | $0$ | dimension zero |
This modular curve is minimally covered by the modular curves in the database listed below.
Covering curve | Level | Index | Degree | Genus | Rank | Kernel decomposition |
---|---|---|---|---|---|---|
56.384.25.ng.1 | $56$ | $8$ | $8$ | $25$ | $8$ | $1^{20}\cdot2^{2}$ |
56.1008.73.bnu.1 | $56$ | $21$ | $21$ | $73$ | $23$ | $1^{16}\cdot2^{26}\cdot4$ |
56.1344.97.bna.1 | $56$ | $28$ | $28$ | $97$ | $31$ | $1^{36}\cdot2^{28}\cdot4$ |
168.144.9.ewo.1 | $168$ | $3$ | $3$ | $9$ | $?$ | not computed |
168.192.9.bof.1 | $168$ | $4$ | $4$ | $9$ | $?$ | not computed |
280.240.17.yu.1 | $280$ | $5$ | $5$ | $17$ | $?$ | not computed |
280.288.17.dfo.1 | $280$ | $6$ | $6$ | $17$ | $?$ | not computed |