Invariants
| Level: | $198$ | $\SL_2$-level: | $18$ | Newform level: | $1$ | ||
| Index: | $144$ | $\PSL_2$-index: | $72$ | ||||
| Genus: | $4 = 1 + \frac{ 72 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 6 }{2}$ | ||||||
| Cusps: | $6$ (of which $2$ are rational) | Cusp widths | $6^{3}\cdot18^{3}$ | Cusp orbits | $1^{2}\cdot2^{2}$ | ||
| Elliptic points: | $0$ of order $2$ and $0$ of order $3$ | ||||||
| Analytic rank: | not computed | ||||||
| $\Q$-gonality: | $3 \le \gamma \le 4$ | ||||||
| $\overline{\Q}$-gonality: | $3 \le \gamma \le 4$ | ||||||
| Rational cusps: | $2$ | ||||||
| Rational CM points: | none |
Other labels
| Cummins and Pauli (CP) label: | 18D4 |
Level structure
| $\GL_2(\Z/198\Z)$-generators: | $\begin{bmatrix}150&115\\197&130\end{bmatrix}$, $\begin{bmatrix}169&30\\22&161\end{bmatrix}$ |
| Contains $-I$: | no $\quad$ (see 198.72.4.h.1 for the level structure with $-I$) |
| Cyclic 198-isogeny field degree: | $36$ |
| Cyclic 198-torsion field degree: | $2160$ |
| Full 198-torsion field degree: | $2138400$ |
Rational points
This modular curve has 2 rational cusps but no known non-cuspidal rational points.
Modular covers
This modular curve minimally covers the modular curves listed below.
| Covered curve | Level | Index | Degree | Genus | Rank |
|---|---|---|---|---|---|
| 18.72.2-18.c.1.1 | $18$ | $2$ | $2$ | $2$ | $0$ |
| 198.72.2-18.c.1.2 | $198$ | $2$ | $2$ | $2$ | $?$ |
| 66.48.0-66.b.1.2 | $66$ | $3$ | $3$ | $0$ | $0$ |
| 198.48.2-198.b.1.1 | $198$ | $3$ | $3$ | $2$ | $?$ |
This modular curve is minimally covered by the modular curves in the database listed below.
| Covering curve | Level | Index | Degree | Genus |
|---|---|---|---|---|
| 198.432.10-198.e.1.2 | $198$ | $3$ | $3$ | $10$ |
| 198.432.10-198.h.1.1 | $198$ | $3$ | $3$ | $10$ |
| 198.432.10-198.h.2.3 | $198$ | $3$ | $3$ | $10$ |
| 198.432.10-198.j.1.1 | $198$ | $3$ | $3$ | $10$ |