Minimal equation
Minimal equation
Simplified equation
$y^2 + xy = x^6 - x^5 - 2x^4 + 3x^3 + x^2 - 2x$ | (homogenize, simplify) |
$y^2 + xz^2y = x^6 - x^5z - 2x^4z^2 + 3x^3z^3 + x^2z^4 - 2xz^5$ | (dehomogenize, simplify) |
$y^2 = 4x^6 - 4x^5 - 8x^4 + 12x^3 + 5x^2 - 8x$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, -2, 1, 3, -2, -1, 1]), R([0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, -2, 1, 3, -2, -1, 1], R![0, 1]);
sage: X = HyperellipticCurve(R([0, -8, 5, 12, -8, -4, 4]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(251578\) | \(=\) | \( 2 \cdot 125789 \) | magma: Conductor(LSeries(C)); Factorization($1);
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Discriminant: | \( \Delta \) | \(=\) | \(503156\) | \(=\) | \( 2^{2} \cdot 125789 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(696\) | \(=\) | \( 2^{3} \cdot 3 \cdot 29 \) |
\( I_4 \) | \(=\) | \(-4464\) | \(=\) | \( - 2^{4} \cdot 3^{2} \cdot 31 \) |
\( I_6 \) | \(=\) | \(-2086677\) | \(=\) | \( - 3^{2} \cdot 103 \cdot 2251 \) |
\( I_{10} \) | \(=\) | \(2012624\) | \(=\) | \( 2^{4} \cdot 125789 \) |
\( J_2 \) | \(=\) | \(348\) | \(=\) | \( 2^{2} \cdot 3 \cdot 29 \) |
\( J_4 \) | \(=\) | \(5790\) | \(=\) | \( 2 \cdot 3 \cdot 5 \cdot 193 \) |
\( J_6 \) | \(=\) | \(257489\) | \(=\) | \( 257489 \) |
\( J_8 \) | \(=\) | \(14020518\) | \(=\) | \( 2 \cdot 3 \cdot 19^{2} \cdot 6473 \) |
\( J_{10} \) | \(=\) | \(503156\) | \(=\) | \( 2^{2} \cdot 125789 \) |
\( g_1 \) | \(=\) | \(1275957556992/125789\) | ||
\( g_2 \) | \(=\) | \(61003717920/125789\) | ||
\( g_3 \) | \(=\) | \(7795736964/125789\) |
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
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((0 : 0 : 1)\) | \((-1 : 0 : 1)\) | \((1 : 0 : 1)\) | \((-1 : 1 : 1)\) |
\((1 : -1 : 1)\) | \((2 : 4 : 1)\) | \((-2 : -6 : 1)\) | \((2 : -6 : 1)\) | \((-2 : 8 : 1)\) | \((8 : 468 : 1)\) |
\((8 : -476 : 1)\) | \((-1 : -3749 : 24)\) | \((-1 : 4325 : 24)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((0 : 0 : 1)\) | \((-1 : 0 : 1)\) | \((1 : 0 : 1)\) | \((-1 : 1 : 1)\) |
\((1 : -1 : 1)\) | \((2 : 4 : 1)\) | \((-2 : -6 : 1)\) | \((2 : -6 : 1)\) | \((-2 : 8 : 1)\) | \((8 : 468 : 1)\) |
\((8 : -476 : 1)\) | \((-1 : -3749 : 24)\) | \((-1 : 4325 : 24)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -2 : 0)\) | \((1 : 2 : 0)\) | \((0 : 0 : 1)\) | \((-1 : -1 : 1)\) | \((-1 : 1 : 1)\) | \((1 : -1 : 1)\) |
\((1 : 1 : 1)\) | \((2 : -10 : 1)\) | \((2 : 10 : 1)\) | \((-2 : -14 : 1)\) | \((-2 : 14 : 1)\) | \((8 : -944 : 1)\) |
\((8 : 944 : 1)\) | \((-1 : -8074 : 24)\) | \((-1 : 8074 : 24)\) |
magma: [C![-2,-6,1],C![-2,8,1],C![-1,-3749,24],C![-1,0,1],C![-1,1,1],C![-1,4325,24],C![0,0,1],C![1,-1,0],C![1,-1,1],C![1,0,1],C![1,1,0],C![2,-6,1],C![2,4,1],C![8,-476,1],C![8,468,1]]; // minimal model
magma: [C![-2,-14,1],C![-2,14,1],C![-1,-8074,24],C![-1,-1,1],C![-1,1,1],C![-1,8074,24],C![0,0,1],C![1,-2,0],C![1,-1,1],C![1,1,1],C![1,2,0],C![2,-10,1],C![2,10,1],C![8,-944,1],C![8,944,1]]; // 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: \(\Z \oplus \Z \oplus \Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) + (1 : -1 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-xz^2\) | \(0.476987\) | \(\infty\) |
\((0 : 0 : 1) - (1 : 1 : 0)\) | \(z x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3\) | \(0.527687\) | \(\infty\) |
\((-1 : 1 : 1) + (1 : -1 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-xz^2\) | \(0.290478\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) + (1 : -1 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-xz^2\) | \(0.476987\) | \(\infty\) |
\((0 : 0 : 1) - (1 : 1 : 0)\) | \(z x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3\) | \(0.527687\) | \(\infty\) |
\((-1 : 1 : 1) + (1 : -1 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-xz^2\) | \(0.290478\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) + (1 : -1 : 1) - (1 : -2 : 0) - (1 : 2 : 0)\) | \(x (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-xz^2\) | \(0.476987\) | \(\infty\) |
\((0 : 0 : 1) - (1 : 2 : 0)\) | \(z x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-2x^3 + xz^2\) | \(0.527687\) | \(\infty\) |
\((-1 : 1 : 1) + (1 : -1 : 1) - (1 : -2 : 0) - (1 : 2 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-xz^2\) | \(0.290478\) | \(\infty\) |
2-torsion field: 5.1.2012624.1
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(3\) (upper bound) |
Mordell-Weil rank: | \(3\) |
2-Selmer rank: | \(3\) |
Regulator: | \( 0.062423 \) |
Real period: | \( 13.65694 \) |
Tamagawa product: | \( 2 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 1.705033 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(1\) | \(2\) | \(2\) | \(( 1 + T )( 1 + 2 T^{2} )\) | |
\(125789\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 + 552 T + 125789 T^{2} )\) |
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? |
---|---|---|
\(2\) | 2.6.1 | no |
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);