Minimal equation
Minimal equation
Simplified equation
$y^2 = x^5 - 6x^4 + 6x^3 + 6x^2 + x$ | (homogenize, simplify) |
$y^2 = x^5z - 6x^4z^2 + 6x^3z^3 + 6x^2z^4 + xz^5$ | (dehomogenize, simplify) |
$y^2 = x^5 - 6x^4 + 6x^3 + 6x^2 + x$ | (homogenize, minimize) |
Invariants
Conductor: | \( N \) | \(=\) | \(40960\) | \(=\) | \( 2^{13} \cdot 5 \) | magma: Conductor(LSeries(C: ExcFactors:=[*<2,Valuation(40960,2),R![1]>*])); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(655360\) | \(=\) | \( 2^{17} \cdot 5 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(416\) | \(=\) | \( 2^{5} \cdot 13 \) |
\( I_4 \) | \(=\) | \(268\) | \(=\) | \( 2^{2} \cdot 67 \) |
\( I_6 \) | \(=\) | \(37184\) | \(=\) | \( 2^{6} \cdot 7 \cdot 83 \) |
\( I_{10} \) | \(=\) | \(80\) | \(=\) | \( 2^{4} \cdot 5 \) |
\( J_2 \) | \(=\) | \(1664\) | \(=\) | \( 2^{7} \cdot 13 \) |
\( J_4 \) | \(=\) | \(112512\) | \(=\) | \( 2^{7} \cdot 3 \cdot 293 \) |
\( J_6 \) | \(=\) | \(9871360\) | \(=\) | \( 2^{13} \cdot 5 \cdot 241 \) |
\( J_8 \) | \(=\) | \(941748224\) | \(=\) | \( 2^{12} \cdot 19 \cdot 12101 \) |
\( J_{10} \) | \(=\) | \(655360\) | \(=\) | \( 2^{17} \cdot 5 \) |
\( g_1 \) | \(=\) | \(97332232192/5\) | ||
\( g_2 \) | \(=\) | \(3955021824/5\) | ||
\( g_3 \) | \(=\) | \(41706496\) |
Automorphism group
\(\mathrm{Aut}(X)\) | \(\simeq\) | $C_2$ | magma: AutomorphismGroup(C); IdentifyGroup($1);
|
\(\mathrm{Aut}(X_{\overline{\Q}})\) | \(\simeq\) | $C_2^2$ | magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
|
Rational points
Number of rational Weierstrass points: \(2\)
This curve is locally solvable everywhere.
Mordell-Weil group of the Jacobian
Group structure: \(\Z/{2}\Z \oplus \Z/{2}\Z\)
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : 0 : 0)\) | \(x^2 - 2xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(2\) |
\(D_0 - 2 \cdot(1 : 0 : 0)\) | \(x^2 - 4xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(2\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : 0 : 0)\) | \(x^2 - 2xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(2\) |
\(D_0 - 2 \cdot(1 : 0 : 0)\) | \(x^2 - 4xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(2\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : 0 : 0)\) | \(x^2 - 2xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(2\) |
\(D_0 - 2 \cdot(1 : 0 : 0)\) | \(x^2 - 4xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0\) | \(2\) |
2-torsion field: \(\Q(\sqrt{2}, \sqrt{5})\)
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(0\) |
Mordell-Weil rank: | \(0\) |
2-Selmer rank: | \(2\) |
Regulator: | \( 1 \) |
Real period: | \( 11.80852 \) |
Tamagawa product: | \( 2 \) |
Torsion order: | \( 4 \) |
Leading coefficient: | \( 1.476065 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(13\) | \(17\) | \(2\) | \(1\) | |
\(5\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 - 2 T + 5 T^{2} )\) |
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? |
---|---|---|
\(2\) | 2.180.3 | yes |
\(3\) | 3.45.1 | no |
Sato-Tate group
\(\mathrm{ST}\) | \(\simeq\) | $N(\mathrm{SU}(2)\times\mathrm{SU}(2))$ |
\(\mathrm{ST}^0\) | \(\simeq\) | \(\mathrm{SU}(2)\times\mathrm{SU}(2)\) |
Decomposition of the Jacobian
Splits over the number field \(\Q (b) \simeq \) \(\Q(\sqrt{-1}) \) with defining polynomial:
\(x^{2} + 1\)
Decomposes up to isogeny as the product of the non-isogenous elliptic curve isogeny classes:
Elliptic curve isogeny class 2.0.4.1-2560.1-a
Elliptic curve isogeny class 2.0.4.1-2560.2-b
Endomorphisms of the Jacobian
Not of \(\GL_2\)-type over \(\Q\)
Endomorphism ring over \(\Q\):
\(\End (J_{})\) | \(\simeq\) | \(\Z\) |
\(\End (J_{}) \otimes \Q \) | \(\simeq\) | \(\Q\) |
\(\End (J_{}) \otimes \R\) | \(\simeq\) | \(\R\) |
Smallest field over which all endomorphisms are defined:
Galois number field \(K = \Q (a) \simeq \) \(\Q(\sqrt{-1}) \) with defining polynomial \(x^{2} + 1\)
Of \(\GL_2\)-type over \(\overline{\Q}\)
Endomorphism ring over \(\overline{\Q}\):
\(\End (J_{\overline{\Q}})\) | \(\simeq\) | an order of index \(2\) in \(\Z \times \Z\) |
\(\End (J_{\overline{\Q}}) \otimes \Q \) | \(\simeq\) | \(\Q\) \(\times\) \(\Q\) |
\(\End (J_{\overline{\Q}}) \otimes \R\) | \(\simeq\) | \(\R \times \R\) |