$\GL_2(\Z/40\Z)$-generators: |
$\begin{bmatrix}3&34\\0&13\end{bmatrix}$, $\begin{bmatrix}7&10\\0&7\end{bmatrix}$, $\begin{bmatrix}11&23\\0&37\end{bmatrix}$, $\begin{bmatrix}11&33\\0&11\end{bmatrix}$, $\begin{bmatrix}17&1\\0&39\end{bmatrix}$, $\begin{bmatrix}33&4\\0&31\end{bmatrix}$, $\begin{bmatrix}37&32\\0&9\end{bmatrix}$ |
Contains $-I$: |
yes |
Quadratic refinements: |
40.144.3-40.bx.1.1, 40.144.3-40.bx.1.2, 40.144.3-40.bx.1.3, 40.144.3-40.bx.1.4, 40.144.3-40.bx.1.5, 40.144.3-40.bx.1.6, 40.144.3-40.bx.1.7, 40.144.3-40.bx.1.8, 40.144.3-40.bx.1.9, 40.144.3-40.bx.1.10, 40.144.3-40.bx.1.11, 40.144.3-40.bx.1.12, 40.144.3-40.bx.1.13, 40.144.3-40.bx.1.14, 40.144.3-40.bx.1.15, 40.144.3-40.bx.1.16, 40.144.3-40.bx.1.17, 40.144.3-40.bx.1.18, 40.144.3-40.bx.1.19, 40.144.3-40.bx.1.20, 40.144.3-40.bx.1.21, 40.144.3-40.bx.1.22, 40.144.3-40.bx.1.23, 40.144.3-40.bx.1.24, 40.144.3-40.bx.1.25, 40.144.3-40.bx.1.26, 40.144.3-40.bx.1.27, 40.144.3-40.bx.1.28, 40.144.3-40.bx.1.29, 40.144.3-40.bx.1.30, 40.144.3-40.bx.1.31, 40.144.3-40.bx.1.32, 40.144.3-40.bx.1.33, 40.144.3-40.bx.1.34, 40.144.3-40.bx.1.35, 40.144.3-40.bx.1.36, 40.144.3-40.bx.1.37, 40.144.3-40.bx.1.38, 40.144.3-40.bx.1.39, 40.144.3-40.bx.1.40, 40.144.3-40.bx.1.41, 40.144.3-40.bx.1.42, 40.144.3-40.bx.1.43, 40.144.3-40.bx.1.44, 40.144.3-40.bx.1.45, 40.144.3-40.bx.1.46, 40.144.3-40.bx.1.47, 40.144.3-40.bx.1.48, 80.144.3-40.bx.1.1, 80.144.3-40.bx.1.2, 80.144.3-40.bx.1.3, 80.144.3-40.bx.1.4, 80.144.3-40.bx.1.5, 80.144.3-40.bx.1.6, 80.144.3-40.bx.1.7, 80.144.3-40.bx.1.8, 80.144.3-40.bx.1.9, 80.144.3-40.bx.1.10, 80.144.3-40.bx.1.11, 80.144.3-40.bx.1.12, 80.144.3-40.bx.1.13, 80.144.3-40.bx.1.14, 80.144.3-40.bx.1.15, 80.144.3-40.bx.1.16, 80.144.3-40.bx.1.17, 80.144.3-40.bx.1.18, 80.144.3-40.bx.1.19, 80.144.3-40.bx.1.20, 80.144.3-40.bx.1.21, 80.144.3-40.bx.1.22, 80.144.3-40.bx.1.23, 80.144.3-40.bx.1.24, 80.144.3-40.bx.1.25, 80.144.3-40.bx.1.26, 80.144.3-40.bx.1.27, 80.144.3-40.bx.1.28, 80.144.3-40.bx.1.29, 80.144.3-40.bx.1.30, 80.144.3-40.bx.1.31, 80.144.3-40.bx.1.32, 120.144.3-40.bx.1.1, 120.144.3-40.bx.1.2, 120.144.3-40.bx.1.3, 120.144.3-40.bx.1.4, 120.144.3-40.bx.1.5, 120.144.3-40.bx.1.6, 120.144.3-40.bx.1.7, 120.144.3-40.bx.1.8, 120.144.3-40.bx.1.9, 120.144.3-40.bx.1.10, 120.144.3-40.bx.1.11, 120.144.3-40.bx.1.12, 120.144.3-40.bx.1.13, 120.144.3-40.bx.1.14, 120.144.3-40.bx.1.15, 120.144.3-40.bx.1.16, 120.144.3-40.bx.1.17, 120.144.3-40.bx.1.18, 120.144.3-40.bx.1.19, 120.144.3-40.bx.1.20, 120.144.3-40.bx.1.21, 120.144.3-40.bx.1.22, 120.144.3-40.bx.1.23, 120.144.3-40.bx.1.24, 120.144.3-40.bx.1.25, 120.144.3-40.bx.1.26, 120.144.3-40.bx.1.27, 120.144.3-40.bx.1.28, 120.144.3-40.bx.1.29, 120.144.3-40.bx.1.30, 120.144.3-40.bx.1.31, 120.144.3-40.bx.1.32, 120.144.3-40.bx.1.33, 120.144.3-40.bx.1.34, 120.144.3-40.bx.1.35, 120.144.3-40.bx.1.36, 120.144.3-40.bx.1.37, 120.144.3-40.bx.1.38, 120.144.3-40.bx.1.39, 120.144.3-40.bx.1.40, 120.144.3-40.bx.1.41, 120.144.3-40.bx.1.42, 120.144.3-40.bx.1.43, 120.144.3-40.bx.1.44, 120.144.3-40.bx.1.45, 120.144.3-40.bx.1.46, 120.144.3-40.bx.1.47, 120.144.3-40.bx.1.48, 240.144.3-40.bx.1.1, 240.144.3-40.bx.1.2, 240.144.3-40.bx.1.3, 240.144.3-40.bx.1.4, 240.144.3-40.bx.1.5, 240.144.3-40.bx.1.6, 240.144.3-40.bx.1.7, 240.144.3-40.bx.1.8, 240.144.3-40.bx.1.9, 240.144.3-40.bx.1.10, 240.144.3-40.bx.1.11, 240.144.3-40.bx.1.12, 240.144.3-40.bx.1.13, 240.144.3-40.bx.1.14, 240.144.3-40.bx.1.15, 240.144.3-40.bx.1.16, 240.144.3-40.bx.1.17, 240.144.3-40.bx.1.18, 240.144.3-40.bx.1.19, 240.144.3-40.bx.1.20, 240.144.3-40.bx.1.21, 240.144.3-40.bx.1.22, 240.144.3-40.bx.1.23, 240.144.3-40.bx.1.24, 240.144.3-40.bx.1.25, 240.144.3-40.bx.1.26, 240.144.3-40.bx.1.27, 240.144.3-40.bx.1.28, 240.144.3-40.bx.1.29, 240.144.3-40.bx.1.30, 240.144.3-40.bx.1.31, 240.144.3-40.bx.1.32, 280.144.3-40.bx.1.1, 280.144.3-40.bx.1.2, 280.144.3-40.bx.1.3, 280.144.3-40.bx.1.4, 280.144.3-40.bx.1.5, 280.144.3-40.bx.1.6, 280.144.3-40.bx.1.7, 280.144.3-40.bx.1.8, 280.144.3-40.bx.1.9, 280.144.3-40.bx.1.10, 280.144.3-40.bx.1.11, 280.144.3-40.bx.1.12, 280.144.3-40.bx.1.13, 280.144.3-40.bx.1.14, 280.144.3-40.bx.1.15, 280.144.3-40.bx.1.16, 280.144.3-40.bx.1.17, 280.144.3-40.bx.1.18, 280.144.3-40.bx.1.19, 280.144.3-40.bx.1.20, 280.144.3-40.bx.1.21, 280.144.3-40.bx.1.22, 280.144.3-40.bx.1.23, 280.144.3-40.bx.1.24, 280.144.3-40.bx.1.25, 280.144.3-40.bx.1.26, 280.144.3-40.bx.1.27, 280.144.3-40.bx.1.28, 280.144.3-40.bx.1.29, 280.144.3-40.bx.1.30, 280.144.3-40.bx.1.31, 280.144.3-40.bx.1.32, 280.144.3-40.bx.1.33, 280.144.3-40.bx.1.34, 280.144.3-40.bx.1.35, 280.144.3-40.bx.1.36, 280.144.3-40.bx.1.37, 280.144.3-40.bx.1.38, 280.144.3-40.bx.1.39, 280.144.3-40.bx.1.40, 280.144.3-40.bx.1.41, 280.144.3-40.bx.1.42, 280.144.3-40.bx.1.43, 280.144.3-40.bx.1.44, 280.144.3-40.bx.1.45, 280.144.3-40.bx.1.46, 280.144.3-40.bx.1.47, 280.144.3-40.bx.1.48 |
Cyclic 40-isogeny field degree: |
$1$ |
Cyclic 40-torsion field degree: |
$16$ |
Full 40-torsion field degree: |
$10240$ |
Embedded model Embedded model in $\mathbb{P}^{4}$
$ 0 $ | $=$ | $ - x t^{2} + y^{2} t $ |
| $=$ | $y w^{2} + y w t + z w t$ |
| $=$ | $y w t + y t^{2} + z t^{2}$ |
| $=$ | $x w t + x t^{2} + y z t$ |
| $=$ | $\cdots$ |
Singular plane model Singular plane model
$ 0 $ | $=$ | $ x^{4} y + 5 x^{4} z - x^{2} y^{2} z - 6 x^{2} y z^{2} - 5 x^{2} z^{3} + y^{2} z^{3} + y z^{4} $ |
Weierstrass model Weierstrass model
$ y^{2} + \left(x^{4} + 1\right) y $ | $=$ | $ 2x^{6} - x^{4} + 2x^{2} $ |
This modular curve has 8 rational cusps but no known non-cuspidal rational points. The following are the coordinates of the rational cusps on this modular curve.
Embedded model |
$(0:0:1:0:0)$, $(1:-1:1:0:1)$, $(0:0:0:-1:1)$, $(1:0:0:0:0)$, $(0:0:-1:1:0)$, $(0:0:1:1:0)$, $(1:1:-1:0:1)$, $(0:0:0:0:1)$ |
Maps between models of this curve
Birational map from embedded model to plane model:
$\displaystyle X$ |
$=$ |
$\displaystyle y$ |
$\displaystyle Y$ |
$=$ |
$\displaystyle w$ |
$\displaystyle Z$ |
$=$ |
$\displaystyle t$ |
Birational map from embedded model to Weierstrass model:
$\displaystyle X$ |
$=$ |
$\displaystyle -y$ |
$\displaystyle Y$ |
$=$ |
$\displaystyle -y^{2}wt-3y^{2}t^{2}+wt^{3}$ |
$\displaystyle Z$ |
$=$ |
$\displaystyle t$ |
Maps to other modular curves
$j$-invariant map
of degree 72 from the embedded model of this modular curve to the modular curve
$X(1)$
:
$\displaystyle j$ |
$=$ |
$\displaystyle -\frac{x^{11}-705x^{10}t+170015x^{9}t^{2}-15035355x^{8}t^{3}+254385970x^{7}t^{4}-2560733026x^{6}t^{5}-4296636730x^{5}t^{6}-85385769230x^{4}t^{7}-196268373347x^{3}t^{8}-271804879117x^{2}t^{9}+320871972160xwt^{9}+320871972235xt^{10}+25600z^{10}t-51200z^{8}w^{2}t-307200z^{8}t^{3}+1408024z^{6}w^{2}t^{3}-5093914z^{6}wt^{4}+34899252z^{6}t^{5}-181832860z^{4}w^{2}t^{5}+374770690z^{4}wt^{6}-751038298z^{4}t^{7}+11644965696z^{2}w^{2}t^{7}+73670355200z^{2}wt^{8}+239921319936z^{2}t^{9}-25w^{11}+25675w^{10}t-154475w^{9}t^{2}-199499w^{8}t^{3}+6543608w^{7}t^{4}+99804538w^{6}t^{5}-556106258w^{5}t^{6}-8994220992w^{4}t^{7}-60160972083w^{3}t^{8}-163974757569w^{2}t^{9}-112158658639wt^{10}}{t(x^{10}+37x^{9}t+590x^{8}t^{2}+5410x^{7}t^{3}+32513x^{6}t^{4}+140649x^{5}t^{5}+474800x^{4}t^{6}+1439696x^{3}t^{7}+7013040x^{2}t^{8}-7372964xwt^{8}-7372964xt^{9}-z^{6}wt^{3}-31z^{6}t^{4}-417z^{4}w^{2}t^{4}-4034z^{4}wt^{5}-24435z^{4}t^{6}-93104z^{2}w^{2}t^{6}-566430z^{2}wt^{7}-1709306z^{2}t^{8}+w^{7}t^{3}+467w^{6}t^{4}+1894w^{5}t^{5}+114800w^{4}t^{6}+288975w^{3}t^{7}+1992057w^{2}t^{8}+1816454wt^{9})}$ |
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Cover information
Click on a modular curve in the diagram to see information about it.
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The following modular covers realize this modular curve as a fiber product over $X(1)$.
This modular curve minimally covers the modular curves listed below.
This modular curve is minimally covered by the modular curves in the database listed below.