Invariants
Level: | $40$ | $\SL_2$-level: | $8$ | Newform level: | $32$ | ||
Index: | $24$ | $\PSL_2$-index: | $24$ | ||||
Genus: | $1 = 1 + \frac{ 24 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 4 }{2}$ | ||||||
Cusps: | $4$ (none of which are rational) | Cusp widths | $4^{2}\cdot8^{2}$ | Cusp orbits | $2^{2}$ | ||
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: | 8B1 |
Rouse, Sutherland, and Zureick-Brown (RSZB) label: | 40.24.1.80 |
Level structure
$\GL_2(\Z/40\Z)$-generators: | $\begin{bmatrix}1&20\\14&29\end{bmatrix}$, $\begin{bmatrix}7&0\\24&3\end{bmatrix}$, $\begin{bmatrix}7&14\\27&7\end{bmatrix}$, $\begin{bmatrix}31&26\\5&37\end{bmatrix}$ |
Contains $-I$: | yes |
Quadratic refinements: | 40.48.1-40.w.1.1, 40.48.1-40.w.1.2, 40.48.1-40.w.1.3, 40.48.1-40.w.1.4, 80.48.1-40.w.1.1, 80.48.1-40.w.1.2, 80.48.1-40.w.1.3, 80.48.1-40.w.1.4, 120.48.1-40.w.1.1, 120.48.1-40.w.1.2, 120.48.1-40.w.1.3, 120.48.1-40.w.1.4, 240.48.1-40.w.1.1, 240.48.1-40.w.1.2, 240.48.1-40.w.1.3, 240.48.1-40.w.1.4, 280.48.1-40.w.1.1, 280.48.1-40.w.1.2, 280.48.1-40.w.1.3, 280.48.1-40.w.1.4 |
Cyclic 40-isogeny field degree: | $24$ |
Cyclic 40-torsion field degree: | $384$ |
Full 40-torsion field degree: | $30720$ |
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 $ | $=$ | $ 5 y^{2} + 4 z^{2} + w^{2} $ |
$=$ | $20 x^{2} + z w$ |
Singular plane model Singular plane model
$ 0 $ | $=$ | $ 4 x^{4} + 5 y^{2} z^{2} + 25 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:
$\displaystyle X$ | $=$ | $\displaystyle x$ |
$\displaystyle Y$ | $=$ | $\displaystyle \frac{1}{2}y$ |
$\displaystyle Z$ | $=$ | $\displaystyle \frac{1}{10}w$ |
Maps to other modular curves
$j$-invariant map of degree 24 from the embedded model of this modular curve to the modular curve $X(1)$ :
$\displaystyle j$ | $=$ | $\displaystyle 2^8\,\frac{(z^{2}+w^{2})^{3}}{w^{2}z^{4}}$ |
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 |
---|---|---|---|---|---|---|
8.12.1.b.1 | $8$ | $2$ | $2$ | $1$ | $0$ | dimension zero |
20.12.0.j.1 | $20$ | $2$ | $2$ | $0$ | $0$ | full Jacobian |
40.12.0.by.1 | $40$ | $2$ | $2$ | $0$ | $0$ | full Jacobian |
This modular curve is minimally covered by the modular curves in the database listed below.
Covering curve | Level | Index | Degree | Genus | Rank | Kernel decomposition |
---|---|---|---|---|---|---|
40.120.9.bm.1 | $40$ | $5$ | $5$ | $9$ | $3$ | $1^{6}\cdot2$ |
40.144.9.ck.1 | $40$ | $6$ | $6$ | $9$ | $1$ | $1^{6}\cdot2$ |
40.240.17.ls.1 | $40$ | $10$ | $10$ | $17$ | $5$ | $1^{12}\cdot2^{2}$ |
80.48.3.cz.1 | $80$ | $2$ | $2$ | $3$ | $?$ | not computed |
80.48.3.da.1 | $80$ | $2$ | $2$ | $3$ | $?$ | not computed |
80.48.3.dl.1 | $80$ | $2$ | $2$ | $3$ | $?$ | not computed |
80.48.3.dm.1 | $80$ | $2$ | $2$ | $3$ | $?$ | not computed |
120.72.5.cs.1 | $120$ | $3$ | $3$ | $5$ | $?$ | not computed |
120.96.5.bw.1 | $120$ | $4$ | $4$ | $5$ | $?$ | not computed |
240.48.3.dp.1 | $240$ | $2$ | $2$ | $3$ | $?$ | not computed |
240.48.3.dq.1 | $240$ | $2$ | $2$ | $3$ | $?$ | not computed |
240.48.3.eb.1 | $240$ | $2$ | $2$ | $3$ | $?$ | not computed |
240.48.3.ec.1 | $240$ | $2$ | $2$ | $3$ | $?$ | not computed |
280.192.13.bw.1 | $280$ | $8$ | $8$ | $13$ | $?$ | not computed |