Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + x)y = x^6 - 5x^5 - 19x^4 - x^3 + 35x^2 + 4x - 17$ | (homogenize, simplify) |
$y^2 + (x^3 + xz^2)y = x^6 - 5x^5z - 19x^4z^2 - x^3z^3 + 35x^2z^4 + 4xz^5 - 17z^6$ | (dehomogenize, simplify) |
$y^2 = 5x^6 - 20x^5 - 74x^4 - 4x^3 + 141x^2 + 16x - 68$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([-17, 4, 35, -1, -19, -5, 1]), R([0, 1, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![-17, 4, 35, -1, -19, -5, 1], R![0, 1, 0, 1]);
sage: X = HyperellipticCurve(R([-68, 16, 141, -4, -74, -20, 5]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(206320\) | \(=\) | \( 2^{4} \cdot 5 \cdot 2579 \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(-206320\) | \(=\) | \( - 2^{4} \cdot 5 \cdot 2579 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(58960\) | \(=\) | \( 2^{4} \cdot 5 \cdot 11 \cdot 67 \) |
\( I_4 \) | \(=\) | \(-30220712\) | \(=\) | \( - 2^{3} \cdot 23^{2} \cdot 37 \cdot 193 \) |
\( I_6 \) | \(=\) | \(-309167612820\) | \(=\) | \( - 2^{2} \cdot 3^{2} \cdot 5 \cdot 11 \cdot 71 \cdot 2199229 \) |
\( I_{10} \) | \(=\) | \(-825280\) | \(=\) | \( - 2^{6} \cdot 5 \cdot 2579 \) |
\( J_2 \) | \(=\) | \(29480\) | \(=\) | \( 2^{3} \cdot 5 \cdot 11 \cdot 67 \) |
\( J_4 \) | \(=\) | \(41248052\) | \(=\) | \( 2^{2} \cdot 17 \cdot 606589 \) |
\( J_6 \) | \(=\) | \(52412289380\) | \(=\) | \( 2^{2} \cdot 5 \cdot 11 \cdot 238237679 \) |
\( J_8 \) | \(=\) | \(-39071875718076\) | \(=\) | \( - 2^{2} \cdot 3 \cdot 29 \cdot 197 \cdot 3671 \cdot 155251 \) |
\( J_{10} \) | \(=\) | \(-206320\) | \(=\) | \( - 2^{4} \cdot 5 \cdot 2579 \) |
\( g_1 \) | \(=\) | \(-278321918217544960000/2579\) | ||
\( g_2 \) | \(=\) | \(-13209789397242204800/2579\) | ||
\( g_3 \) | \(=\) | \(-569374616204904400/2579\) |
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);
|
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: \(\Z/{2}\Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - D_\infty\) | \(5x^2 - 4z^2\) | \(=\) | \(0,\) | \(10y\) | \(=\) | \(-9xz^2\) | \(0\) | \(2\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - D_\infty\) | \(5x^2 - 4z^2\) | \(=\) | \(0,\) | \(10y\) | \(=\) | \(-9xz^2\) | \(0\) | \(2\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - D_\infty\) | \(5x^2 - 4z^2\) | \(=\) | \(0,\) | \(10y\) | \(=\) | \(x^3 - 17xz^2\) | \(0\) | \(2\) |
2-torsion field: 6.2.13302482000.1
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(0\) |
Mordell-Weil rank: | \(0\) |
2-Selmer rank: | \(3\) |
Regulator: | \( 1 \) |
Real period: | \( 1.104842 \) |
Tamagawa product: | \( 1 \) |
Torsion order: | \( 2 \) |
Leading coefficient: | \( 4.419370 \) |
Analytic order of Ш: | \( 16 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(4\) | \(4\) | \(1\) | \(1 - T\) | |
\(5\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 - 2 T + 5 T^{2} )\) | |
\(2579\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 - 4 T + 2579 T^{2} )\) |
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);