Properties

Label 40.288.7-40.fb.1.12
Level $40$
Index $288$
Genus $7$
Analytic rank $2$
Cusps $12$
$\Q$-cusps $0$

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Invariants

Level: $40$ $\SL_2$-level: $40$ Newform level: $400$
Index: $288$ $\PSL_2$-index:$144$
Genus: $7 = 1 + \frac{ 144 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 12 }{2}$
Cusps: $12$ (none of which are rational) Cusp widths $2^{4}\cdot8^{2}\cdot10^{4}\cdot40^{2}$ Cusp orbits $2^{6}$
Elliptic points: $0$ of order $2$ and $0$ of order $3$
Analytic rank: $2$
$\Q$-gonality: $4$
$\overline{\Q}$-gonality: $4$
Rational cusps: $0$
Rational CM points: none

Other labels

Cummins and Pauli (CP) label: 40M7
Rouse, Sutherland, and Zureick-Brown (RSZB) label: 40.288.7.3536

Level structure

$\GL_2(\Z/40\Z)$-generators: $\begin{bmatrix}13&10\\24&19\end{bmatrix}$, $\begin{bmatrix}15&19\\12&7\end{bmatrix}$, $\begin{bmatrix}29&28\\32&5\end{bmatrix}$, $\begin{bmatrix}31&16\\0&37\end{bmatrix}$
Contains $-I$: no $\quad$ (see 40.144.7.fb.1 for the level structure with $-I$)
Cyclic 40-isogeny field degree: $2$
Cyclic 40-torsion field degree: $32$
Full 40-torsion field degree: $2560$

Jacobian

Conductor: $2^{26}\cdot5^{11}$
Simple: no
Squarefree: no
Decomposition: $1^{7}$
Newforms: 20.2.a.a, 80.2.a.a, 80.2.a.b, 400.2.a.c$^{2}$, 400.2.a.e$^{2}$

Models

Canonical model in $\mathbb{P}^{ 6 }$ defined by 10 equations

$ 0 $ $=$ $ x t + y^{2} $
$=$ $y v + 2 w t + t u$
$=$ $ - x v + 2 y w + y u$
$=$ $2 y w - y u + z t$
$=$$\cdots$
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Singular plane model Singular plane model

$ 0 $ $=$ $ 625 x^{8} + 500 x^{6} y^{2} + 125 x^{6} z^{2} + 150 x^{4} y^{4} - 25 x^{4} y^{2} z^{2} + 20 x^{2} y^{6} + \cdots + y^{6} z^{2} $
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Rational points

This modular curve has no real points and no $\Q_p$ points for $p=31$, and therefore no rational points.

Maps to other modular curves

$j$-invariant map of degree 144 from the canonical model of this modular curve to the modular curve $X(1)$ :

$\displaystyle j$ $=$ $\displaystyle -2^6\,\frac{15625z^{12}-187500z^{11}v+656250z^{10}v^{2}-1187500z^{9}v^{3}+2109375z^{8}v^{4}-4125000z^{7}v^{5}+30183413z^{6}v^{6}-123220900z^{5}v^{7}+145053880z^{4}v^{8}-33904484z^{3}v^{9}+293260029z^{2}v^{10}-4086zu^{10}v+1083258zu^{8}v^{3}-160392412zu^{6}v^{5}-14547614zu^{4}v^{7}+651275562zu^{2}v^{9}+86192604zv^{11}+64000000wu^{11}+320025284wu^{9}v^{2}+422307088wu^{7}v^{4}-873448316wu^{5}v^{6}-2225742704wu^{3}v^{8}-815911144wuv^{10}-80019530t^{2}u^{10}-320021615t^{2}u^{8}v^{2}-207836145t^{2}u^{6}v^{4}+1462675730t^{2}u^{4}v^{6}+1523139895t^{2}u^{2}v^{8}+442309925t^{2}v^{10}-31999999u^{12}-144016548u^{10}v^{2}-114057644u^{8}v^{4}+495278393u^{6}v^{6}+1053151493u^{4}v^{8}+744668535u^{2}v^{10}+88461986v^{12}}{v(16z^{6}v^{5}+556z^{5}v^{6}-3147z^{4}v^{7}+10560z^{3}v^{8}-8936z^{2}v^{9}+16zu^{10}-748zu^{8}v^{2}-1709zu^{6}v^{4}-5202zu^{4}v^{6}+7739zu^{2}v^{8}+9960zv^{10}+384wu^{9}v-3660wu^{7}v^{3}-10276wu^{5}v^{5}-32264wu^{3}v^{7}-37352wuv^{9}-500t^{2}u^{8}v+5205t^{2}u^{6}v^{3}+5750t^{2}u^{4}v^{5}+30385t^{2}u^{2}v^{7}-14725t^{2}v^{9}-192u^{10}v+1274u^{8}v^{3}+1819u^{6}v^{5}+4781u^{4}v^{7}+4257u^{2}v^{9}-2945v^{11})}$

Map of degree 1 from the canonical model of this modular curve to the plane model of the modular curve 40.144.7.fb.1 :

$\displaystyle X$ $=$ $\displaystyle x$
$\displaystyle Y$ $=$ $\displaystyle z$
$\displaystyle Z$ $=$ $\displaystyle 4w$

Equation of the image curve:

$0$ $=$ $ 625X^{8}+500X^{6}Y^{2}+125X^{6}Z^{2}+150X^{4}Y^{4}-25X^{4}Y^{2}Z^{2}+20X^{2}Y^{6}-5X^{2}Y^{4}Z^{2}+5X^{2}Y^{2}Z^{4}+Y^{8}+Y^{6}Z^{2} $

Modular covers

This modular curve minimally covers the modular curves listed below.

Covered curve Level Index Degree Genus Rank Kernel decomposition
40.48.0-40.bw.1.4 $40$ $6$ $6$ $0$ $0$ full Jacobian
40.144.3-20.p.1.2 $40$ $2$ $2$ $3$ $1$ $1^{4}$
40.144.3-20.p.1.5 $40$ $2$ $2$ $3$ $1$ $1^{4}$
40.144.3-40.ce.1.23 $40$ $2$ $2$ $3$ $1$ $1^{4}$
40.144.3-40.ce.1.30 $40$ $2$ $2$ $3$ $1$ $1^{4}$
40.144.3-40.cg.1.7 $40$ $2$ $2$ $3$ $0$ $1^{4}$
40.144.3-40.cg.1.12 $40$ $2$ $2$ $3$ $0$ $1^{4}$

This modular curve is minimally covered by the modular curves in the database listed below.

Covering curve Level Index Degree Genus Rank Kernel decomposition
40.576.13-40.py.1.11 $40$ $2$ $2$ $13$ $2$ $2^{3}$
40.576.13-40.py.2.7 $40$ $2$ $2$ $13$ $2$ $2^{3}$
40.576.13-40.pz.1.2 $40$ $2$ $2$ $13$ $2$ $2^{3}$
40.576.13-40.pz.2.8 $40$ $2$ $2$ $13$ $2$ $2^{3}$
40.576.13-40.qg.1.8 $40$ $2$ $2$ $13$ $2$ $2^{3}$
40.576.13-40.qg.2.2 $40$ $2$ $2$ $13$ $2$ $2^{3}$
40.576.13-40.qh.1.12 $40$ $2$ $2$ $13$ $2$ $2^{3}$
40.576.13-40.qh.2.6 $40$ $2$ $2$ $13$ $2$ $2^{3}$
40.1440.43-40.bbw.1.4 $40$ $5$ $5$ $43$ $11$ $1^{36}$