Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^2 + x)y = 2x^5 - 14x^3 - 5x^2 + 30x$ | (homogenize, simplify) |
$y^2 + (x^2z + xz^2)y = 2x^5z - 14x^3z^3 - 5x^2z^4 + 30xz^5$ | (dehomogenize, simplify) |
$y^2 = 8x^5 + x^4 - 54x^3 - 19x^2 + 120x$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, 30, -5, -14, 0, 2]), R([0, 1, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, 30, -5, -14, 0, 2], R![0, 1, 1]);
sage: X = HyperellipticCurve(R([0, 120, -19, -54, 1, 8]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(1740\) | \(=\) | \( 2^{2} \cdot 3 \cdot 5 \cdot 29 \) | magma: Conductor(LSeries(C)); Factorization($1);
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Discriminant: | \( \Delta \) | \(=\) | \(-104400\) | \(=\) | \( - 2^{4} \cdot 3^{2} \cdot 5^{2} \cdot 29 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(28100\) | \(=\) | \( 2^{2} \cdot 5^{2} \cdot 281 \) |
\( I_4 \) | \(=\) | \(7231657\) | \(=\) | \( 7231657 \) |
\( I_6 \) | \(=\) | \(99549877317\) | \(=\) | \( 3 \cdot 11 \cdot 1657 \cdot 1820557 \) |
\( I_{10} \) | \(=\) | \(-13363200\) | \(=\) | \( - 2^{11} \cdot 3^{2} \cdot 5^{2} \cdot 29 \) |
\( J_2 \) | \(=\) | \(7025\) | \(=\) | \( 5^{2} \cdot 281 \) |
\( J_4 \) | \(=\) | \(1754957\) | \(=\) | \( 1754957 \) |
\( J_6 \) | \(=\) | \(7872289\) | \(=\) | \( 19 \cdot 414331 \) |
\( J_8 \) | \(=\) | \(-756142810406\) | \(=\) | \( - 2 \cdot 29 \cdot 13036945007 \) |
\( J_{10} \) | \(=\) | \(-104400\) | \(=\) | \( - 2^{4} \cdot 3^{2} \cdot 5^{2} \cdot 29 \) |
\( g_1 \) | \(=\) | \(-684371056797265625/4176\) | ||
\( g_2 \) | \(=\) | \(-24336911168273125/4176\) | ||
\( g_3 \) | \(=\) | \(-15540095293225/4176\) |
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
All points: \((1 : 0 : 0),\, (0 : 0 : 1),\, (2 : -2 : 1),\, (2 : -4 : 1),\, (15 : -1380 : 8)\)
magma: [C![0,0,1],C![1,0,0],C![2,-4,1],C![2,-2,1],C![15,-1380,8]]; // minimal model
magma: [C![0,0,1],C![1,0,0],C![2,-2,1],C![2,2,1],C![15,0,8]]; // simplified model
Number of rational Weierstrass points: \(3\)
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: \(\Z/{2}\Z \oplus \Z/{6}\Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) + (15 : -1380 : 8) - 2 \cdot(1 : 0 : 0)\) | \(x (8x - 15z)\) | \(=\) | \(0,\) | \(16y\) | \(=\) | \(-23xz^2\) | \(0\) | \(2\) |
\((2 : -4 : 1) + (15 : -1380 : 8) - 2 \cdot(1 : 0 : 0)\) | \((x - 2z) (8x - 15z)\) | \(=\) | \(0,\) | \(16y\) | \(=\) | \(-167xz^2 + 270z^3\) | \(0\) | \(6\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) + (15 : -1380 : 8) - 2 \cdot(1 : 0 : 0)\) | \(x (8x - 15z)\) | \(=\) | \(0,\) | \(16y\) | \(=\) | \(-23xz^2\) | \(0\) | \(2\) |
\((2 : -4 : 1) + (15 : -1380 : 8) - 2 \cdot(1 : 0 : 0)\) | \((x - 2z) (8x - 15z)\) | \(=\) | \(0,\) | \(16y\) | \(=\) | \(-167xz^2 + 270z^3\) | \(0\) | \(6\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) - (1 : 0 : 0)\) | \(x (8x - 15z)\) | \(=\) | \(0,\) | \(16y\) | \(=\) | \(x^2z - 45xz^2\) | \(0\) | \(2\) |
\(D_0 - 2 \cdot(1 : 0 : 0)\) | \((x - 2z) (8x - 15z)\) | \(=\) | \(0,\) | \(16y\) | \(=\) | \(x^2z - 333xz^2 + 540z^3\) | \(0\) | \(6\) |
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(0\) |
Mordell-Weil rank: | \(0\) |
2-Selmer rank: | \(2\) |
Regulator: | \( 1 \) |
Real period: | \( 5.116046 \) |
Tamagawa product: | \( 16 \) |
Torsion order: | \( 12 \) |
Leading coefficient: | \( 0.568449 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(2\) | \(4\) | \(4\) | \(( 1 - T )( 1 + T )\) | |
\(3\) | \(1\) | \(2\) | \(2\) | \(( 1 + T )( 1 - T + 3 T^{2} )\) | |
\(5\) | \(1\) | \(2\) | \(2\) | \(( 1 - T )( 1 + 3 T + 5 T^{2} )\) | |
\(29\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 - 6 T + 29 T^{2} )\) |
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? |
---|---|---|
\(2\) | 2.120.3 | yes |
\(3\) | 3.80.1 | 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);