$\GL_2(\Z/40\Z)$-generators: |
$\begin{bmatrix}11&4\\10&21\end{bmatrix}$, $\begin{bmatrix}21&2\\21&39\end{bmatrix}$, $\begin{bmatrix}21&16\\36&15\end{bmatrix}$, $\begin{bmatrix}21&36\\34&15\end{bmatrix}$, $\begin{bmatrix}23&14\\23&33\end{bmatrix}$ |
Contains $-I$: |
yes |
Quadratic refinements: |
40.48.1-40.s.1.1, 40.48.1-40.s.1.2, 40.48.1-40.s.1.3, 40.48.1-40.s.1.4, 40.48.1-40.s.1.5, 40.48.1-40.s.1.6, 40.48.1-40.s.1.7, 40.48.1-40.s.1.8, 40.48.1-40.s.1.9, 40.48.1-40.s.1.10, 40.48.1-40.s.1.11, 40.48.1-40.s.1.12, 80.48.1-40.s.1.1, 80.48.1-40.s.1.2, 80.48.1-40.s.1.3, 80.48.1-40.s.1.4, 80.48.1-40.s.1.5, 80.48.1-40.s.1.6, 80.48.1-40.s.1.7, 80.48.1-40.s.1.8, 120.48.1-40.s.1.1, 120.48.1-40.s.1.2, 120.48.1-40.s.1.3, 120.48.1-40.s.1.4, 120.48.1-40.s.1.5, 120.48.1-40.s.1.6, 120.48.1-40.s.1.7, 120.48.1-40.s.1.8, 120.48.1-40.s.1.9, 120.48.1-40.s.1.10, 120.48.1-40.s.1.11, 120.48.1-40.s.1.12, 240.48.1-40.s.1.1, 240.48.1-40.s.1.2, 240.48.1-40.s.1.3, 240.48.1-40.s.1.4, 240.48.1-40.s.1.5, 240.48.1-40.s.1.6, 240.48.1-40.s.1.7, 240.48.1-40.s.1.8, 280.48.1-40.s.1.1, 280.48.1-40.s.1.2, 280.48.1-40.s.1.3, 280.48.1-40.s.1.4, 280.48.1-40.s.1.5, 280.48.1-40.s.1.6, 280.48.1-40.s.1.7, 280.48.1-40.s.1.8, 280.48.1-40.s.1.9, 280.48.1-40.s.1.10, 280.48.1-40.s.1.11, 280.48.1-40.s.1.12 |
Cyclic 40-isogeny field degree: |
$24$ |
Cyclic 40-torsion field degree: |
$384$ |
Full 40-torsion field degree: |
$30720$ |
Embedded model Embedded model in $\mathbb{P}^{3}$
$ 0 $ | $=$ | $ y^{2} + y z - z^{2} - w^{2} $ |
| $=$ | $20 x^{2} + y w - 2 z w$ |
Singular plane model Singular plane model
$ 0 $ | $=$ | $ x^{4} - 5 x^{2} y z + 5 y^{2} z^{2} - 25 z^{4} $ |
This modular curve has real points and $\Q_p$ points for $p$ not dividing the level, but no known rational points.
Maps between models of this curve
Birational map from embedded model to plane model:
$\displaystyle X$ |
$=$ |
$\displaystyle x$ |
$\displaystyle Y$ |
$=$ |
$\displaystyle \frac{1}{2}z$ |
$\displaystyle Z$ |
$=$ |
$\displaystyle \frac{1}{10}w$ |
Maps to other modular curves
$j$-invariant map
of degree 24 from the embedded model of this modular curve to the modular curve
$X(1)$
:
$\displaystyle j$ |
$=$ |
$\displaystyle 2^8\,\frac{1000yz^{5}+575yz^{3}w^{2}+60yzw^{4}-625z^{6}-800z^{4}w^{2}-210z^{2}w^{4}-8w^{6}}{w^{4}(5yz-5z^{2}-w^{2})}$ |
Hi
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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.
This modular curve is minimally covered by the modular curves in the database listed below.