$\GL_2(\Z/56\Z)$-generators: |
$\begin{bmatrix}15&36\\22&5\end{bmatrix}$, $\begin{bmatrix}19&44\\44&11\end{bmatrix}$, $\begin{bmatrix}39&10\\52&21\end{bmatrix}$, $\begin{bmatrix}45&22\\42&53\end{bmatrix}$ |
Contains $-I$: |
yes |
Quadratic refinements: |
56.192.1-56.bs.2.1, 56.192.1-56.bs.2.2, 56.192.1-56.bs.2.3, 56.192.1-56.bs.2.4, 56.192.1-56.bs.2.5, 56.192.1-56.bs.2.6, 56.192.1-56.bs.2.7, 56.192.1-56.bs.2.8, 168.192.1-56.bs.2.1, 168.192.1-56.bs.2.2, 168.192.1-56.bs.2.3, 168.192.1-56.bs.2.4, 168.192.1-56.bs.2.5, 168.192.1-56.bs.2.6, 168.192.1-56.bs.2.7, 168.192.1-56.bs.2.8, 280.192.1-56.bs.2.1, 280.192.1-56.bs.2.2, 280.192.1-56.bs.2.3, 280.192.1-56.bs.2.4, 280.192.1-56.bs.2.5, 280.192.1-56.bs.2.6, 280.192.1-56.bs.2.7, 280.192.1-56.bs.2.8 |
Cyclic 56-isogeny field degree: |
$16$ |
Cyclic 56-torsion field degree: |
$384$ |
Full 56-torsion field degree: |
$32256$ |
Embedded model Embedded model in $\mathbb{P}^{3}$
$ 0 $ | $=$ | $ 2 x^{2} + 2 y^{2} + w^{2} $ |
| $=$ | $2 x^{2} + 2 x z + x w - 2 y^{2} + 2 z^{2} + 2 z w + 3 w^{2}$ |
Singular plane model Singular plane model
$ 0 $ | $=$ | $ x^{4} + 4 x^{3} z - 3 x^{2} y^{2} + 14 x^{2} z^{2} - 6 x y^{2} z + 20 x z^{3} + 4 y^{4} - 15 y^{2} z^{2} + 18 z^{4} $ |
This modular curve has no real points, and therefore no rational points.
Maps between models of this curve
Birational map from embedded model to plane model:
$\displaystyle X$ |
$=$ |
$\displaystyle z$ |
$\displaystyle Y$ |
$=$ |
$\displaystyle y$ |
$\displaystyle Z$ |
$=$ |
$\displaystyle \frac{1}{2}w$ |
Maps to other modular curves
$j$-invariant map
of degree 96 from the embedded model of this modular curve to the modular curve
$X(1)$
:
$\displaystyle j$ |
$=$ |
$\displaystyle -\frac{1}{2^4}\cdot\frac{17741905920xz^{23}+204031918080xz^{22}w+1317336514560xz^{21}w^{2}+5976804556800xz^{20}w^{3}+20996436787200xz^{19}w^{4}+59950454538240xz^{18}w^{5}+143334362972160xz^{17}w^{6}+292396727992320xz^{16}w^{7}+515321503875072xz^{15}w^{8}+790962520227840xz^{14}w^{9}+1062384665739264xz^{13}w^{10}+1251288083275776xz^{12}w^{11}+1291805664694272xz^{11}w^{12}+1165524391139328xz^{10}w^{13}+913660661928960xz^{9}w^{14}+616450853942784xz^{8}w^{15}+352889713399680xz^{7}w^{16}+167748334157376xz^{6}w^{17}+64053383265504xz^{5}w^{18}+18603309666960xz^{4}w^{19}+3723097012488xz^{3}w^{20}+408695538204xz^{2}w^{21}+9360733698xzw^{22}-139062465xw^{23}-8111783936z^{24}-97341407232z^{23}w-661489975296z^{22}w^{2}-3171827056640z^{21}w^{3}-11822468431872z^{20}w^{4}-35942676037632z^{19}w^{5}-91829339029504z^{18}w^{6}-200917209710592z^{17}w^{7}-381276335308800z^{16}w^{8}-632808940765184z^{15}w^{9}-923344922394624z^{14}w^{10}-1187482168147968z^{13}w^{11}-1346253354700800z^{12}w^{12}-1342408275664896z^{11}w^{13}-1171393186022400z^{10}w^{14}-886937513960448z^{9}w^{15}-574970323089792z^{8}w^{16}-312554378423808z^{7}w^{17}-137756245900128z^{6}w^{18}-46349124375840z^{5}w^{19}-10470739604328z^{4}w^{20}-988369136624z^{3}w^{21}+146794148742z^{2}w^{22}+18102594126zw^{23}+273536188w^{24}}{w^{8}(3047424xz^{15}+22855680xz^{14}w+101326848xz^{13}w^{2}+311980032xz^{12}w^{3}+735381504xz^{11}w^{4}+1375435776xz^{10}w^{5}+2092485120xz^{9}w^{6}+2613904128xz^{8}w^{7}+2691685248xz^{7}w^{8}+2275022400xz^{6}w^{9}+1562331744xz^{5}w^{10}+854652240xz^{4}w^{11}+360869976xz^{3}w^{12}+111257172xz^{2}w^{13}+22564974xzw^{14}+2292705xw^{15}-2916352z^{16}-23330816z^{15}w-111583232z^{14}w^{2}-372793344z^{13}w^{3}-960620544z^{12}w^{4}-1978961920z^{11}w^{5}-3345920512z^{10}w^{6}-4693770752z^{9}w^{7}-5498077568z^{8}w^{8}-5371456000z^{7}w^{9}-4354352096z^{6}w^{10}-2893290144z^{5}w^{11}-1546838904z^{4}w^{12}-644718480z^{3}w^{13}-199248550z^{2}w^{14}-41236302zw^{15}-4509756w^{16})}$ |
Hi
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Cover information
Click on a modular curve in the diagram to see information about it.
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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.