Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + x)y = x^3 + 3x^2 - x$ | (homogenize, simplify) |
$y^2 + (x^3 + xz^2)y = x^3z^3 + 3x^2z^4 - xz^5$ | (dehomogenize, simplify) |
$y^2 = x^6 + 2x^4 + 4x^3 + 13x^2 - 4x$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, -1, 3, 1]), R([0, 1, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, -1, 3, 1], R![0, 1, 0, 1]);
sage: X = HyperellipticCurve(R([0, -4, 13, 4, 2, 0, 1]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(20072\) | \(=\) | \( 2^{3} \cdot 13 \cdot 193 \) | magma: Conductor(LSeries(C)); Factorization($1);
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Discriminant: | \( \Delta \) | \(=\) | \(642304\) | \(=\) | \( 2^{8} \cdot 13 \cdot 193 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(40\) | \(=\) | \( 2^{3} \cdot 5 \) |
\( I_4 \) | \(=\) | \(2437\) | \(=\) | \( 2437 \) |
\( I_6 \) | \(=\) | \(25101\) | \(=\) | \( 3^{2} \cdot 2789 \) |
\( I_{10} \) | \(=\) | \(-80288\) | \(=\) | \( - 2^{5} \cdot 13 \cdot 193 \) |
\( J_2 \) | \(=\) | \(40\) | \(=\) | \( 2^{3} \cdot 5 \) |
\( J_4 \) | \(=\) | \(-1558\) | \(=\) | \( - 2 \cdot 19 \cdot 41 \) |
\( J_6 \) | \(=\) | \(-4112\) | \(=\) | \( - 2^{4} \cdot 257 \) |
\( J_8 \) | \(=\) | \(-647961\) | \(=\) | \( - 3 \cdot 271 \cdot 797 \) |
\( J_{10} \) | \(=\) | \(-642304\) | \(=\) | \( - 2^{8} \cdot 13 \cdot 193 \) |
\( g_1 \) | \(=\) | \(-400000/2509\) | ||
\( g_2 \) | \(=\) | \(389500/2509\) | ||
\( g_3 \) | \(=\) | \(25700/2509\) |
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 | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((0 : 0 : 1)\) | \((-1 : -1 : 1)\) | \((1 : 1 : 1)\) | \((-1 : 3 : 1)\) |
\((1 : -3 : 1)\) | \((1 : 3 : 2)\) | \((1 : -8 : 2)\) | \((-16 : -4 : 5)\) | \((-1 : -17 : 3)\) | \((-1 : 27 : 3)\) |
\((-16 : 4500 : 5)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((0 : 0 : 1)\) | \((-1 : -1 : 1)\) | \((1 : 1 : 1)\) | \((-1 : 3 : 1)\) |
\((1 : -3 : 1)\) | \((1 : 3 : 2)\) | \((1 : -8 : 2)\) | \((-16 : -4 : 5)\) | \((-1 : -17 : 3)\) | \((-1 : 27 : 3)\) |
\((-16 : 4500 : 5)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((0 : 0 : 1)\) | \((-1 : -4 : 1)\) | \((-1 : 4 : 1)\) | \((1 : -4 : 1)\) |
\((1 : 4 : 1)\) | \((1 : -11 : 2)\) | \((1 : 11 : 2)\) | \((-1 : -44 : 3)\) | \((-1 : 44 : 3)\) | \((-16 : -4504 : 5)\) |
\((-16 : 4504 : 5)\) |
magma: [C![-16,-4,5],C![-16,4500,5],C![-1,-17,3],C![-1,-1,1],C![-1,3,1],C![-1,27,3],C![0,0,1],C![1,-8,2],C![1,-3,1],C![1,-1,0],C![1,0,0],C![1,1,1],C![1,3,2]]; // minimal model
magma: [C![-16,-4504,5],C![-16,4504,5],C![-1,-44,3],C![-1,-4,1],C![-1,4,1],C![-1,44,3],C![0,0,1],C![1,-11,2],C![1,-4,1],C![1,-1,0],C![1,1,0],C![1,4,1],C![1,11,2]]; // 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: \(\Z \oplus \Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) - (1 : -1 : 0)\) | \(z x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.159063\) | \(\infty\) |
\((1 : 1 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(z^3\) | \(0.090652\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) - (1 : -1 : 0)\) | \(z x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.159063\) | \(\infty\) |
\((1 : 1 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(z^3\) | \(0.090652\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) - (1 : -1 : 0)\) | \(z x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + xz^2\) | \(0.159063\) | \(\infty\) |
\((1 : 4 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + xz^2 + 2z^3\) | \(0.090652\) | \(\infty\) |
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(2\) |
Mordell-Weil rank: | \(2\) |
2-Selmer rank: | \(2\) |
Regulator: | \( 0.012444 \) |
Real period: | \( 14.01677 \) |
Tamagawa product: | \( 4 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 0.697754 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(3\) | \(8\) | \(4\) | \(1 + T + 2 T^{2}\) | |
\(13\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 + 4 T + 13 T^{2} )\) | |
\(193\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 - 14 T + 193 T^{2} )\) |
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);