Minimal equation
Minimal equation
Simplified equation
| $y^2 + (x^3 + 1)y = -x^6 - 7x^5 - 10x^4 + 6x^3 - 36x^2 + 17x - 19$ | (homogenize, simplify) |
| $y^2 + (x^3 + z^3)y = -x^6 - 7x^5z - 10x^4z^2 + 6x^3z^3 - 36x^2z^4 + 17xz^5 - 19z^6$ | (dehomogenize, simplify) |
| $y^2 = -3x^6 - 28x^5 - 40x^4 + 26x^3 - 144x^2 + 68x - 75$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([-19, 17, -36, 6, -10, -7, -1]), R([1, 0, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![-19, 17, -36, 6, -10, -7, -1], R![1, 0, 0, 1]);
sage: X = HyperellipticCurve(R([-75, 68, -144, 26, -40, -28, -3]))
magma: X,pi:= SimplifiedModel(C);
Invariants
| Conductor: | \( N \) | \(=\) | \(146668\) | \(=\) | \( 2^{2} \cdot 37 \cdot 991 \) | magma: Conductor(LSeries(C)); Factorization($1);
|
| Discriminant: | \( \Delta \) | \(=\) | \(293336\) | \(=\) | \( 2^{3} \cdot 37 \cdot 991 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
| \( I_2 \) | \(=\) | \(109132\) | \(=\) | \( 2^{2} \cdot 27283 \) |
| \( I_4 \) | \(=\) | \(807946057\) | \(=\) | \( 193 \cdot 1321 \cdot 3169 \) |
| \( I_6 \) | \(=\) | \(21735800790011\) | \(=\) | \( 7 \cdot 11 \cdot 23 \cdot 12273179441 \) |
| \( I_{10} \) | \(=\) | \(-37547008\) | \(=\) | \( - 2^{10} \cdot 37 \cdot 991 \) |
| \( J_2 \) | \(=\) | \(27283\) | \(=\) | \( 27283 \) |
| \( J_4 \) | \(=\) | \(-2649332\) | \(=\) | \( - 2^{2} \cdot 7^{3} \cdot 1931 \) |
| \( J_6 \) | \(=\) | \(253674768\) | \(=\) | \( 2^{4} \cdot 3 \cdot 5284891 \) |
| \( J_8 \) | \(=\) | \(-24487837720\) | \(=\) | \( - 2^{3} \cdot 5 \cdot 612195943 \) |
| \( J_{10} \) | \(=\) | \(-293336\) | \(=\) | \( - 2^{3} \cdot 37 \cdot 991 \) |
| \( g_1 \) | \(=\) | \(-15116826029821931496643/293336\) | ||
| \( g_2 \) | \(=\) | \(13450943946192898271/73334\) | ||
| \( g_3 \) | \(=\) | \(-23603235029383794/36667\) |
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 except over $\Q_{2}$.
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: \(\Z/{2}\Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
| Generator | $D_0$ | Height | Order | |||||
|---|---|---|---|---|---|---|---|---|
| \(D_0 - D_\infty\) | \(3x^2 - 2xz + 3z^2\) | \(=\) | \(0,\) | \(18y\) | \(=\) | \(5xz^2 - 3z^3\) | \(0\) | \(2\) |
| Generator | $D_0$ | Height | Order | |||||
|---|---|---|---|---|---|---|---|---|
| \(D_0 - D_\infty\) | \(3x^2 - 2xz + 3z^2\) | \(=\) | \(0,\) | \(18y\) | \(=\) | \(5xz^2 - 3z^3\) | \(0\) | \(2\) |
| Generator | $D_0$ | Height | Order | |||||
|---|---|---|---|---|---|---|---|---|
| \(D_0 - D_\infty\) | \(3x^2 - 2xz + 3z^2\) | \(=\) | \(0,\) | \(18y\) | \(=\) | \(x^3 + 10xz^2 - 5z^3\) | \(0\) | \(2\) |
2-torsion field: 6.0.172092017792.1
BSD invariants
| Hasse-Weil conjecture: | unverified |
| Analytic rank: | \(0\) |
| Mordell-Weil rank: | \(0\) |
| 2-Selmer rank: | \(4\) |
| Regulator: | \( 1 \) |
| Real period: | \( 1.229818 \) |
| Tamagawa product: | \( 1 \) |
| Torsion order: | \( 2 \) |
| Leading coefficient: | \( 2.459636 \) |
| Analytic order of Ш: | \( 8 \) (rounded) |
| Order of Ш: | twice a square |
Local invariants
| Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
|---|---|---|---|---|---|
| \(2\) | \(2\) | \(3\) | \(1\) | \(( 1 - T )( 1 + T )\) | |
| \(37\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 - 6 T + 37 T^{2} )\) |  |
| \(991\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 + 32 T + 991 T^{2} )\) | |
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 |
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);