$\GL_2(\Z/8\Z)$-generators: |
$\begin{bmatrix}1&5\\4&3\end{bmatrix}$, $\begin{bmatrix}7&4\\0&7\end{bmatrix}$, $\begin{bmatrix}7&6\\4&3\end{bmatrix}$ |
$\GL_2(\Z/8\Z)$-subgroup: |
$C_2^2.D_4$ |
Contains $-I$: |
yes |
Quadratic refinements: |
8.96.1-8.ba.1.1, 8.96.1-8.ba.1.2, 16.96.1-8.ba.1.1, 16.96.1-8.ba.1.2, 24.96.1-8.ba.1.1, 24.96.1-8.ba.1.2, 40.96.1-8.ba.1.1, 40.96.1-8.ba.1.2, 48.96.1-8.ba.1.1, 48.96.1-8.ba.1.2, 56.96.1-8.ba.1.1, 56.96.1-8.ba.1.2, 80.96.1-8.ba.1.1, 80.96.1-8.ba.1.2, 88.96.1-8.ba.1.1, 88.96.1-8.ba.1.2, 104.96.1-8.ba.1.1, 104.96.1-8.ba.1.2, 112.96.1-8.ba.1.1, 112.96.1-8.ba.1.2, 120.96.1-8.ba.1.1, 120.96.1-8.ba.1.2, 136.96.1-8.ba.1.1, 136.96.1-8.ba.1.2, 152.96.1-8.ba.1.1, 152.96.1-8.ba.1.2, 168.96.1-8.ba.1.1, 168.96.1-8.ba.1.2, 176.96.1-8.ba.1.1, 176.96.1-8.ba.1.2, 184.96.1-8.ba.1.1, 184.96.1-8.ba.1.2, 208.96.1-8.ba.1.1, 208.96.1-8.ba.1.2, 232.96.1-8.ba.1.1, 232.96.1-8.ba.1.2, 240.96.1-8.ba.1.1, 240.96.1-8.ba.1.2, 248.96.1-8.ba.1.1, 248.96.1-8.ba.1.2, 264.96.1-8.ba.1.1, 264.96.1-8.ba.1.2, 272.96.1-8.ba.1.1, 272.96.1-8.ba.1.2, 280.96.1-8.ba.1.1, 280.96.1-8.ba.1.2, 296.96.1-8.ba.1.1, 296.96.1-8.ba.1.2, 304.96.1-8.ba.1.1, 304.96.1-8.ba.1.2, 312.96.1-8.ba.1.1, 312.96.1-8.ba.1.2, 328.96.1-8.ba.1.1, 328.96.1-8.ba.1.2 |
Cyclic 8-isogeny field degree: |
$2$ |
Cyclic 8-torsion field degree: |
$8$ |
Full 8-torsion field degree: |
$32$ |
Embedded model Embedded model in $\mathbb{P}^{3}$
$ 0 $ | $=$ | $ x^{2} + y z $ |
| $=$ | $y^{2} + z^{2} + 8 w^{2}$ |
Singular plane model Singular plane model
$ 0 $ | $=$ | $ x^{4} + 2 y^{2} z^{2} + z^{4} $ |
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:
$\displaystyle X$ |
$=$ |
$\displaystyle x$ |
$\displaystyle Y$ |
$=$ |
$\displaystyle 2w$ |
$\displaystyle Z$ |
$=$ |
$\displaystyle z$ |
Maps to other modular curves
$j$-invariant map
of degree 48 from the embedded model of this modular curve to the modular curve
$X(1)$
:
$\displaystyle j$ |
$=$ |
$\displaystyle 2^4\,\frac{(z^{4}+8z^{2}w^{2}+4w^{4})^{3}}{w^{8}z^{2}(z^{2}+8w^{2})}$ |
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.