Properties

Label 6437.a.6437.1
Conductor 6437
Discriminant 6437
Mordell-Weil group \(\Z \times \Z\)
Sato-Tate group $\mathrm{USp}(4)$
\(\End(J_{\overline{\Q}}) \otimes \R\) \(\R\)
\(\End(J_{\overline{\Q}}) \otimes \Q\) \(\Q\)
\(\overline{\Q}\)-simple yes
\(\mathrm{GL}_2\)-type no

Related objects

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Minimal equation

Minimal equation

Simplified equation

$y^2 + (x^3 + x^2 + x + 1)y = x^3 - 2x$ (homogenize, simplify)
$y^2 + (x^3 + x^2z + xz^2 + z^3)y = x^3z^3 - 2xz^5$ (dehomogenize, simplify)
$y^2 = x^6 + 2x^5 + 3x^4 + 8x^3 + 3x^2 - 6x + 1$ (minimize, homogenize)

sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, -2, 0, 1]), R([1, 1, 1, 1]));
 
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, -2, 0, 1], R![1, 1, 1, 1]);
 
sage: X = HyperellipticCurve(R([1, -6, 3, 8, 3, 2, 1]))
 
magma: X,pi:= SimplifiedModel(C);
 

Invariants

Conductor: \( N \)  \(=\)  \(6437\) \(=\) \( 41 \cdot 157 \)
magma: Conductor(LSeries(C)); Factorization($1);
 
Discriminant: \( \Delta \)  \(=\)  \(6437\) \(=\) \( 41 \cdot 157 \)
magma: Discriminant(C); Factorization(Integers()!$1);
 

Igusa-Clebsch invariants

Igusa invariants

G2 invariants

\( I_2 \)  \(=\) \(120\) \(=\)  \( 2^{3} \cdot 3 \cdot 5 \)
\( I_4 \)  \(=\) \(2772\) \(=\)  \( 2^{2} \cdot 3^{2} \cdot 7 \cdot 11 \)
\( I_6 \)  \(=\) \(168912\) \(=\)  \( 2^{4} \cdot 3^{3} \cdot 17 \cdot 23 \)
\( I_{10} \)  \(=\) \(-25748\) \(=\)  \( - 2^{2} \cdot 41 \cdot 157 \)
\( J_2 \)  \(=\) \(60\) \(=\)  \( 2^{2} \cdot 3 \cdot 5 \)
\( J_4 \)  \(=\) \(-312\) \(=\)  \( - 2^{3} \cdot 3 \cdot 13 \)
\( J_6 \)  \(=\) \(-10568\) \(=\)  \( - 2^{3} \cdot 1321 \)
\( J_8 \)  \(=\) \(-182856\) \(=\)  \( - 2^{3} \cdot 3 \cdot 19 \cdot 401 \)
\( J_{10} \)  \(=\) \(-6437\) \(=\)  \( - 41 \cdot 157 \)
\( g_1 \)  \(=\) \(-777600000/6437\)
\( g_2 \)  \(=\) \(67392000/6437\)
\( g_3 \)  \(=\) \(38044800/6437\)

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

Known points
\((1 : 0 : 0)\) \((1 : -1 : 0)\) \((0 : 0 : 1)\) \((0 : -1 : 1)\) \((-1 : -1 : 1)\) \((-1 : 1 : 1)\)
\((-2 : 1 : 1)\) \((-2 : 4 : 1)\) \((1 : -7 : 2)\) \((1 : -8 : 2)\)

magma: [C![-2,1,1],C![-2,4,1],C![-1,-1,1],C![-1,1,1],C![0,-1,1],C![0,0,1],C![1,-8,2],C![1,-7,2],C![1,-1,0],C![1,0,0]];
 

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: \(\Z \times \Z\)

magma: MordellWeilGroupGenus2(Jacobian(C));
 

Generator $D_0$ Height Order
\((-1 : -1 : 1) + (0 : -1 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) \(x (x + z)\) \(=\) \(0,\) \(y\) \(=\) \(-z^3\) \(0.193617\) \(\infty\)
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) \(x^2 + xz - z^2\) \(=\) \(0,\) \(y\) \(=\) \(-xz^2\) \(0.069627\) \(\infty\)

2-torsion field: 6.2.411968.1

BSD invariants

Hasse-Weil conjecture: unverified
Analytic rank: \(2\)
Mordell-Weil rank: \(2\)
2-Selmer rank:\(2\)
Regulator: \( 0.013054 \)
Real period: \( 25.57462 \)
Tamagawa product: \( 1 \)
Torsion order:\( 1 \)
Leading coefficient: \( 0.333856 \)
Analytic order of Ш: \( 1 \)   (rounded)
Order of Ш:square

Local invariants

Prime ord(\(N\)) ord(\(\Delta\)) Tamagawa L-factor Cluster picture
\(41\) \(1\) \(1\) \(1\) \(( 1 + T )( 1 - T + 41 T^{2} )\)
\(157\) \(1\) \(1\) \(1\) \(( 1 + T )( 1 - 18 T + 157 T^{2} )\)

Sato-Tate group

\(\mathrm{ST}\)\(\simeq\) $\mathrm{USp}(4)$
\(\mathrm{ST}^0\)\(\simeq\) \(\mathrm{USp}(4)\)

Decomposition of the Jacobian

Simple over \(\overline{\Q}\)

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 \(\Q\).