Minimal equation
Minimal equation
Simplified equation
$y^2 + x^2y = x^5 - 8x^4 + 5x^3 + 37x^2 + 32x + 8$ | (homogenize, simplify) |
$y^2 + x^2zy = x^5z - 8x^4z^2 + 5x^3z^3 + 37x^2z^4 + 32xz^5 + 8z^6$ | (dehomogenize, simplify) |
$y^2 = 4x^5 - 31x^4 + 20x^3 + 148x^2 + 128x + 32$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([8, 32, 37, 5, -8, 1]), R([0, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![8, 32, 37, 5, -8, 1], R![0, 0, 1]);
sage: X = HyperellipticCurve(R([32, 128, 148, 20, -31, 4]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(3888\) | \(=\) | \( 2^{4} \cdot 3^{5} \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(248832\) | \(=\) | \( 2^{10} \cdot 3^{5} \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(4012\) | \(=\) | \( 2^{2} \cdot 17 \cdot 59 \) |
\( I_4 \) | \(=\) | \(3321\) | \(=\) | \( 3^{4} \cdot 41 \) |
\( I_6 \) | \(=\) | \(4466715\) | \(=\) | \( 3 \cdot 5 \cdot 11^{2} \cdot 23 \cdot 107 \) |
\( I_{10} \) | \(=\) | \(128\) | \(=\) | \( 2^{7} \) |
\( J_2 \) | \(=\) | \(12036\) | \(=\) | \( 2^{2} \cdot 3 \cdot 17 \cdot 59 \) |
\( J_4 \) | \(=\) | \(6016128\) | \(=\) | \( 2^{7} \cdot 3 \cdot 15667 \) |
\( J_6 \) | \(=\) | \(3995526208\) | \(=\) | \( 2^{6} \cdot 62430097 \) |
\( J_8 \) | \(=\) | \(2974089331776\) | \(=\) | \( 2^{6} \cdot 3 \cdot 29 \cdot 61 \cdot 631 \cdot 13877 \) |
\( J_{10} \) | \(=\) | \(248832\) | \(=\) | \( 2^{10} \cdot 3^{5} \) |
\( g_1 \) | \(=\) | \(1015090270405243\) | ||
\( g_2 \) | \(=\) | \(126467411456072/3\) | ||
\( g_3 \) | \(=\) | \(62805239452873/27\) |
sage: C.igusa_clebsch_invariants(); [factor(a) for a in _]
magma: IgusaClebschInvariants(C); IgusaInvariants(C); G2Invariants(C);
Automorphism group
\(\mathrm{Aut}(X)\) | \(\simeq\) | $C_2$ | magma: AutomorphismGroup(C); IdentifyGroup($1);
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\(\mathrm{Aut}(X_{\overline{\Q}})\) | \(\simeq\) | $C_2$ | magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
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Rational points
All points: \((1 : 0 : 0)\)
magma: [C![1,0,0]]; // minimal model
magma: [C![1,0,0]]; // simplified model
Number of rational Weierstrass points: \(1\)
magma: #Roots(HyperellipticPolynomials(SimplifiedModel(C)));
This curve is locally solvable everywhere.
magma: f,h:=HyperellipticPolynomials(C); g:=4*f+h^2; HasPointsEverywhereLocally(g,2) and (#Roots(ChangeRing(g,RealField())) gt 0 or LeadingCoefficient(g) gt 0);
Mordell-Weil group of the Jacobian
Group structure: \(\Z/{6}\Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : 0 : 0)\) | \(x^2 - 2xz - 2z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-5xz^2 - 4z^3\) | \(0\) | \(6\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : 0 : 0)\) | \(x^2 - 2xz - 2z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-5xz^2 - 4z^3\) | \(0\) | \(6\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - 2 \cdot(1 : 0 : 0)\) | \(x^2 - 2xz - 2z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^2z - 10xz^2 - 8z^3\) | \(0\) | \(6\) |
2-torsion field: 6.6.120932352.1
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(0\) |
Mordell-Weil rank: | \(0\) |
2-Selmer rank: | \(1\) |
Regulator: | \( 1 \) |
Real period: | \( 12.26321 \) |
Tamagawa product: | \( 3 \) |
Torsion order: | \( 6 \) |
Leading coefficient: | \( 1.021934 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(4\) | \(10\) | \(3\) | \(1 - T\) | |
\(3\) | \(5\) | \(5\) | \(1\) | \(1 + 3 T^{2}\) |
Galois representations
The mod-$\ell$ Galois representation has maximal image \(\GSp(4,\F_\ell)\) for all primes \( \ell \) except those listed.
Prime \(\ell\) | mod-\(\ell\) image | Is torsion prime? |
---|---|---|
\(2\) | 2.60.1 | yes |
\(3\) | 3.80.1 | yes |
Sato-Tate group
\(\mathrm{ST}\) | \(\simeq\) | $\mathrm{USp}(4)$ |
\(\mathrm{ST}^0\) | \(\simeq\) | \(\mathrm{USp}(4)\) |
Decomposition of the Jacobian
Simple over \(\overline{\Q}\)
magma: HeuristicDecompositionFactors(C);
Endomorphisms of the Jacobian
Not of \(\GL_2\)-type over \(\Q\)
Endomorphism ring over \(\Q\):
\(\End (J_{})\) | \(\simeq\) | \(\Z\) |
\(\End (J_{}) \otimes \Q \) | \(\simeq\) | \(\Q\) |
\(\End (J_{}) \otimes \R\) | \(\simeq\) | \(\R\) |
All \(\overline{\Q}\)-endomorphisms of the Jacobian are defined over \(\Q\).
magma: //Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
magma: HeuristicIsGL2(C); HeuristicEndomorphismDescription(C); HeuristicEndomorphismFieldOfDefinition(C);
magma: HeuristicIsGL2(C : Geometric := true); HeuristicEndomorphismDescription(C : Geometric := true); HeuristicEndomorphismLatticeDescription(C);