Properties

Label 1376.b.176128.1
Conductor 1376
Discriminant 176128
Mordell-Weil group \(\Z/{6}\Z\)
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

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Minimal equation

Minimal equation

Simplified equation

$y^2 + y = 4x^5 + 4x^4 + x^3 + 2x^2$ (homogenize, simplify)
$y^2 + z^3y = 4x^5z + 4x^4z^2 + x^3z^3 + 2x^2z^4$ (dehomogenize, simplify)
$y^2 = 16x^5 + 16x^4 + 4x^3 + 8x^2 + 1$ (minimize, homogenize)

sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, 0, 2, 1, 4, 4]), R([1]));
 
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, 0, 2, 1, 4, 4], R![1]);
 
sage: X = HyperellipticCurve(R([1, 0, 8, 4, 16, 16]))
 
magma: X,pi:= SimplifiedModel(C);
 

Invariants

Conductor: \( N \)  \(=\)  \(1376\) \(=\) \( 2^{5} \cdot 43 \)
magma: Conductor(LSeries(C: ExcFactors:=[*<2,Valuation(1376,2),R![1, 0, 2]>*])); Factorization($1);
 
Discriminant: \( \Delta \)  \(=\)  \(176128\) \(=\) \( 2^{12} \cdot 43 \)
magma: Discriminant(C); Factorization(Integers()!$1);
 

Igusa-Clebsch invariants

Igusa invariants

G2 invariants

\( I_2 \)  \(=\) \(-1952\) \(=\)  \( - 2^{5} \cdot 61 \)
\( I_4 \)  \(=\) \(643072\) \(=\)  \( 2^{12} \cdot 157 \)
\( I_6 \)  \(=\) \(-245497856\) \(=\)  \( - 2^{17} \cdot 1873 \)
\( I_{10} \)  \(=\) \(721420288\) \(=\)  \( 2^{24} \cdot 43 \)
\( J_2 \)  \(=\) \(-244\) \(=\)  \( - 2^{2} \cdot 61 \)
\( J_4 \)  \(=\) \(-4218\) \(=\)  \( - 2 \cdot 3 \cdot 19 \cdot 37 \)
\( J_6 \)  \(=\) \(-61436\) \(=\)  \( - 2^{2} \cdot 15359 \)
\( J_8 \)  \(=\) \(-700285\) \(=\)  \( - 5 \cdot 140057 \)
\( J_{10} \)  \(=\) \(176128\) \(=\)  \( 2^{12} \cdot 43 \)
\( g_1 \)  \(=\) \(-844596301/172\)
\( g_2 \)  \(=\) \(478702929/1376\)
\( g_3 \)  \(=\) \(-57150839/2752\)

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

All points: \((1 : 0 : 0),\, (0 : 0 : 1),\, (0 : -1 : 1)\)

magma: [C![0,-1,1],C![0,0,1],C![1,0,0]];
 

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: \(\Z/{6}\Z\)

magma: MordellWeilGroupGenus2(Jacobian(C));
 

Generator $D_0$ Height Order
\((0 : -1 : 1) - (1 : 0 : 0)\) \(x\) \(=\) \(0,\) \(y\) \(=\) \(-z^3\) \(0\) \(6\)

2-torsion field: 6.0.473344.1

BSD invariants

Hasse-Weil conjecture: unverified
Analytic rank: \(0\)
Mordell-Weil rank: \(0\)
2-Selmer rank:\(1\)
Regulator: \( 1 \)
Real period: \( 8.781442 \)
Tamagawa product: \( 2 \)
Torsion order:\( 6 \)
Leading coefficient: \( 0.487857 \)
Analytic order of Ш: \( 1 \)   (rounded)
Order of Ш:square

Local invariants

Prime ord(\(N\)) ord(\(\Delta\)) Tamagawa L-factor Cluster picture
\(2\) \(5\) \(12\) \(2\) \(1 + 2 T^{2}\)
\(43\) \(1\) \(1\) \(1\) \(( 1 + T )( 1 - 8 T + 43 T^{2} )\)

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 \(\Q\).