Minimal equation
Minimal equation
Simplified equation
$y^2 + x^3y = 4x^4 + 17x^2 + 8$ | (homogenize, simplify) |
$y^2 + x^3y = 4x^4z^2 + 17x^2z^4 + 8z^6$ | (dehomogenize, simplify) |
$y^2 = x^6 + 16x^4 + 68x^2 + 32$ | (homogenize, minimize) |
Invariants
Conductor: | \( N \) | \(=\) | \(2304\) | \(=\) | \( 2^{8} \cdot 3^{2} \) | magma: Conductor(LSeries(C: ExcFactors:=[*<2,Valuation(2304,2),R![1]>*])); Factorization($1);
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Discriminant: | \( \Delta \) | \(=\) | \(-294912\) | \(=\) | \( - 2^{15} \cdot 3^{2} \) | magma: Discriminant(C); Factorization(Integers()!$1);
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Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(784\) | \(=\) | \( 2^{4} \cdot 7^{2} \) |
\( I_4 \) | \(=\) | \(9991\) | \(=\) | \( 97 \cdot 103 \) |
\( I_6 \) | \(=\) | \(2278962\) | \(=\) | \( 2 \cdot 3^{3} \cdot 7 \cdot 6029 \) |
\( I_{10} \) | \(=\) | \(36\) | \(=\) | \( 2^{2} \cdot 3^{2} \) |
\( J_2 \) | \(=\) | \(3136\) | \(=\) | \( 2^{6} \cdot 7^{2} \) |
\( J_4 \) | \(=\) | \(303200\) | \(=\) | \( 2^{5} \cdot 5^{2} \cdot 379 \) |
\( J_6 \) | \(=\) | \(34578432\) | \(=\) | \( 2^{13} \cdot 3^{2} \cdot 7 \cdot 67 \) |
\( J_8 \) | \(=\) | \(4126930688\) | \(=\) | \( 2^{8} \cdot 16120823 \) |
\( J_{10} \) | \(=\) | \(294912\) | \(=\) | \( 2^{15} \cdot 3^{2} \) |
\( g_1 \) | \(=\) | \(9256148959232/9\) | ||
\( g_2 \) | \(=\) | \(285369414400/9\) | ||
\( g_3 \) | \(=\) | \(1153094656\) |
Automorphism group
\(\mathrm{Aut}(X)\) | \(\simeq\) | $C_2^2$ | magma: AutomorphismGroup(C); IdentifyGroup($1);
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\(\mathrm{Aut}(X_{\overline{\Q}})\) | \(\simeq\) | $C_2^2$ | magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
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Rational points
Number of rational Weierstrass points: \(0\)
This curve is locally solvable everywhere.
Mordell-Weil group of the Jacobian
Group structure: \(\Z/{4}\Z\)
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(4\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(4\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3\) | \(0\) | \(4\) |
2-torsion field: \(\Q(\zeta_{24})\)
BSD invariants
Hasse-Weil conjecture: | verified |
Analytic rank: | \(0\) |
Mordell-Weil rank: | \(0\) |
2-Selmer rank: | \(1\) |
Regulator: | \( 1 \) |
Real period: | \( 5.052371 \) |
Tamagawa product: | \( 2 \) |
Torsion order: | \( 4 \) |
Leading coefficient: | \( 0.631546 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(8\) | \(15\) | \(2\) | \(1\) | |
\(3\) | \(2\) | \(2\) | \(1\) | \(( 1 - T )( 1 + T )\) |
Galois representations
For primes $\ell \ge 5$ the Galois representation data has not been computed for this curve since it is not generic.
For primes $\ell \le 3$, the image of the mod-$\ell$ Galois representation is listed in the table below, whenever it is not all of $\GSp(4,\F_\ell)$.
Prime \(\ell\) | mod-\(\ell\) image | Is torsion prime? |
---|---|---|
\(2\) | 2.90.5 | yes |
\(3\) | 3.90.1 | no |
Sato-Tate group
\(\mathrm{ST}\) | \(\simeq\) | $\mathrm{SU}(2)\times\mathrm{SU}(2)$ |
\(\mathrm{ST}^0\) | \(\simeq\) | \(\mathrm{SU}(2)\times\mathrm{SU}(2)\) |
Decomposition of the Jacobian
Splits over \(\Q\)
Decomposes up to isogeny as the product of the non-isogenous elliptic curve isogeny classes:
Elliptic curve isogeny class 24.a
Elliptic curve isogeny class 96.b
Endomorphisms of the Jacobian
Of \(\GL_2\)-type over \(\Q\)
Endomorphism ring over \(\Q\):
\(\End (J_{})\) | \(\simeq\) | an order of index \(2\) in \(\Z \times \Z\) |
\(\End (J_{}) \otimes \Q \) | \(\simeq\) | \(\Q\) \(\times\) \(\Q\) |
\(\End (J_{}) \otimes \R\) | \(\simeq\) | \(\R \times \R\) |
All \(\overline{\Q}\)-endomorphisms of the Jacobian are defined over \(\Q\).