| Curve name |
$X_{85l}$ |
| Index |
$48$ |
| Level |
$8$ |
| Genus |
$0$ |
| Does the subgroup contain $-I$? |
No |
| Generating matrices |
$
\left[ \begin{matrix} 5 & 5 \\ 0 & 5 \end{matrix}\right],
\left[ \begin{matrix} 1 & 0 \\ 0 & 5 \end{matrix}\right],
\left[ \begin{matrix} 1 & 0 \\ 0 & 7 \end{matrix}\right]$ |
| Images in lower levels |
|
| Meaning/Special name |
|
| Chosen covering |
$X_{85}$ |
| Curves that $X_{85l}$ minimally covers |
|
| Curves that minimally cover $X_{85l}$ |
|
| Curves that minimally cover $X_{85l}$ and have infinitely many rational
points. |
|
| Model |
$\mathbb{P}^{1}$, a universal elliptic curve over an appropriate base is
given by
\[y^2 = x^3 + A(t)x + B(t), \text{ where}\]
\[A(t) = -27t^{8} + 216t^{6} + 1080t^{4} - 6048t^{2} - 432\]
\[B(t) = -54t^{12} + 648t^{10} - 9720t^{8} + 60480t^{6} - 85536t^{4} -
114048t^{2} + 3456\]
|
| Info about rational points |
| Comments on finding rational points |
None |
| Elliptic curve whose $2$-adic image is the subgroup |
$y^2 + xy = x^3 - 34x - 217$, with conductor $21$ |
| Generic density of odd order reductions |
$5/84$ |