| Curve name |
$X_{87n}$ |
| Index |
$48$ |
| Level |
$8$ |
| Genus |
$0$ |
| Does the subgroup contain $-I$? |
No |
| Generating matrices |
$
\left[ \begin{matrix} 7 & 6 \\ 4 & 7 \end{matrix}\right],
\left[ \begin{matrix} 7 & 0 \\ 0 & 1 \end{matrix}\right],
\left[ \begin{matrix} 7 & 0 \\ 0 & 3 \end{matrix}\right],
\left[ \begin{matrix} 3 & 0 \\ 4 & 7 \end{matrix}\right]$ |
| Images in lower levels |
|
| Meaning/Special name |
|
| Chosen covering |
$X_{87}$ |
| Curves that $X_{87n}$ minimally covers |
|
| Curves that minimally cover $X_{87n}$ |
|
| Curves that minimally cover $X_{87n}$ and have infinitely many rational
points. |
|
| Model |
$\mathbb{P}^{1}$, a universal elliptic curve over an appropriate base is
given by
\[y^2 = x^3 + A(t)x + B(t), \text{ where}\]
\[A(t) = -1728t^{12} - 6912t^{10} - 10800t^{8} - 8208t^{6} - 3132t^{4} -
648t^{2} - 108\]
\[B(t) = 27648t^{18} + 165888t^{16} + 425088t^{14} + 604800t^{12} + 515808t^{10}
+ 259200t^{8} + 63504t^{6} - 1296t^{4} - 3888t^{2} - 432\]
|
| Info about rational points |
| Comments on finding rational points |
None |
| Elliptic curve whose $2$-adic image is the subgroup |
$y^2 = x^3 + x^2 - 2033x + 6063$, with conductor $4800$ |
| Generic density of odd order reductions |
$635/5376$ |