| Curve name |
$X_{87k}$ |
| Index |
$48$ |
| Level |
$8$ |
| Genus |
$0$ |
| Does the subgroup contain $-I$? |
No |
| Generating matrices |
$
\left[ \begin{matrix} 1 & 0 \\ 0 & 5 \end{matrix}\right],
\left[ \begin{matrix} 7 & 6 \\ 4 & 7 \end{matrix}\right],
\left[ \begin{matrix} 5 & 0 \\ 4 & 1 \end{matrix}\right],
\left[ \begin{matrix} 3 & 0 \\ 4 & 1 \end{matrix}\right]$ |
| Images in lower levels |
|
| Meaning/Special name |
|
| Chosen covering |
$X_{87}$ |
| Curves that $X_{87k}$ minimally covers |
|
| Curves that minimally cover $X_{87k}$ |
|
| Curves that minimally cover $X_{87k}$ and have infinitely many rational
points. |
|
| Model |
$\mathbb{P}^{1}$, a universal elliptic curve over an appropriate base is
given by
\[y^2 = x^3 + A(t)x + B(t), \text{ where}\]
\[A(t) = -432t^{12} - 1728t^{10} - 2700t^{8} - 2052t^{6} - 783t^{4} - 162t^{2} -
27\]
\[B(t) = 3456t^{18} + 20736t^{16} + 53136t^{14} + 75600t^{12} + 64476t^{10} +
32400t^{8} + 7938t^{6} - 162t^{4} - 486t^{2} - 54\]
|
| Info about rational points |
| Comments on finding rational points |
None |
| Elliptic curve whose $2$-adic image is the subgroup |
$y^2 = x^3 - x^2 - 508x + 1012$, with conductor $600$ |
| Generic density of odd order reductions |
$41/336$ |