Minimal equation
Minimal equation
Simplified equation
| $y^2 + (x + 1)y = 56x^6 + 8x^5 - 67x^4 - 7x^3 + 27x^2 + x - 4$ | (homogenize, simplify) |
| $y^2 + (xz^2 + z^3)y = 56x^6 + 8x^5z - 67x^4z^2 - 7x^3z^3 + 27x^2z^4 + xz^5 - 4z^6$ | (dehomogenize, simplify) |
| $y^2 = 224x^6 + 32x^5 - 268x^4 - 28x^3 + 109x^2 + 6x - 15$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([-4, 1, 27, -7, -67, 8, 56]), R([1, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![-4, 1, 27, -7, -67, 8, 56], R![1, 1]);
sage: X = HyperellipticCurve(R([-15, 6, 109, -28, -268, 32, 224]))
magma: X,pi:= SimplifiedModel(C);
Invariants
| Conductor: | \( N \) | \(=\) | \(3792\) | \(=\) | \( 2^{4} \cdot 3 \cdot 79 \) | magma: Conductor(LSeries(C)); Factorization($1);
|
| Discriminant: | \( \Delta \) | \(=\) | \(485376\) | \(=\) | \( 2^{11} \cdot 3 \cdot 79 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
| \( I_2 \) | \(=\) | \(160772\) | \(=\) | \( 2^{2} \cdot 40193 \) |
| \( I_4 \) | \(=\) | \(8953\) | \(=\) | \( 7 \cdot 1279 \) |
| \( I_6 \) | \(=\) | \(479829669\) | \(=\) | \( 3 \cdot 11 \cdot 859 \cdot 16927 \) |
| \( I_{10} \) | \(=\) | \(60672\) | \(=\) | \( 2^{8} \cdot 3 \cdot 79 \) |
| \( J_2 \) | \(=\) | \(160772\) | \(=\) | \( 2^{2} \cdot 40193 \) |
| \( J_4 \) | \(=\) | \(1076978864\) | \(=\) | \( 2^{4} \cdot 13^{2} \cdot 23 \cdot 17317 \) |
| \( J_6 \) | \(=\) | \(9619229234176\) | \(=\) | \( 2^{10} \cdot 181 \cdot 51899329 \) |
| \( J_8 \) | \(=\) | \(96654812233553344\) | \(=\) | \( 2^{6} \cdot 218423 \cdot 6914250977 \) |
| \( J_{10} \) | \(=\) | \(485376\) | \(=\) | \( 2^{11} \cdot 3 \cdot 79 \) |
| \( g_1 \) | \(=\) | \(104894354662677385384193/474\) | ||
| \( g_2 \) | \(=\) | \(4370573889022291088203/474\) | ||
| \( g_3 \) | \(=\) | \(121403484224429853608/237\) |
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);
|
| \(\mathrm{Aut}(X_{\overline{\Q}})\) | \(\simeq\) | $C_2$ | magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
|
Rational points
This curve has no rational points.
magma: []; // minimal model
magma: []; // simplified model
Number of rational Weierstrass points: \(0\)
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: \(\Z/{10}\Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
| Generator | $D_0$ | Height | Order | |||||
|---|---|---|---|---|---|---|---|---|
| \(D_0 - D_\infty\) | \(2x^2 - z^2\) | \(=\) | \(0,\) | \(2y\) | \(=\) | \(-2xz^2 - z^3\) | \(0\) | \(10\) |
| Generator | $D_0$ | Height | Order | |||||
|---|---|---|---|---|---|---|---|---|
| \(D_0 - D_\infty\) | \(2x^2 - z^2\) | \(=\) | \(0,\) | \(2y\) | \(=\) | \(-2xz^2 - z^3\) | \(0\) | \(10\) |
| Generator | $D_0$ | Height | Order | |||||
|---|---|---|---|---|---|---|---|---|
| \(D_0 - D_\infty\) | \(2x^2 - z^2\) | \(=\) | \(0,\) | \(2y\) | \(=\) | \(-3xz^2 - z^3\) | \(0\) | \(10\) |
2-torsion field: 6.2.21568896.1
BSD invariants
| Hasse-Weil conjecture: | unverified |
| Analytic rank: | \(0\) |
| Mordell-Weil rank: | \(0\) |
| 2-Selmer rank: | \(3\) |
| Regulator: | \( 1 \) |
| Real period: | \( 4.954076 \) |
| Tamagawa product: | \( 5 \) |
| Torsion order: | \( 10 \) |
| Leading coefficient: | \( 0.990815 \) |
| Analytic order of Ш: | \( 4 \) (rounded) |
| Order of Ш: | square |
Local invariants
| Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
|---|---|---|---|---|---|
| \(2\) | \(4\) | \(11\) | \(5\) | \(1 - T\) | |
| \(3\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 + T + 3 T^{2} )\) |  |
| \(79\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 + 79 T^{2} )\) | |
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? |
|---|---|---|
| \(2\) | 2.15.1 | yes |
| \(5\) | not computed | 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);