Properties

Label 66161.a.66161.1
Conductor 66161
Discriminant 66161
Mordell-Weil group \(\Z \times \Z \times \Z\)
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

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Minimal equation

Minimal equation

Simplified equation

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

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

Invariants

Conductor: \( N \)  =  \(66161\) = \( 66161 \)
magma: Conductor(LSeries(C)); Factorization($1);
 
Discriminant: \( \Delta \)  =  \(66161\) = \( 66161 \)
magma: Discriminant(C); Factorization(Integers()!$1);
 

Igusa-Clebsch invariants

Igusa invariants

G2 invariants

\( I_2 \)  = \(-1248\) =  \( - 2^{5} \cdot 3 \cdot 13 \)
\( I_4 \)  = \(95040\) =  \( 2^{6} \cdot 3^{3} \cdot 5 \cdot 11 \)
\( I_6 \)  = \(-37711872\) =  \( - 2^{12} \cdot 3^{3} \cdot 11 \cdot 31 \)
\( I_{10} \)  = \(270995456\) =  \( 2^{12} \cdot 66161 \)
\( J_2 \)  = \(-156\) =  \( - 2^{2} \cdot 3 \cdot 13 \)
\( J_4 \)  = \(24\) =  \( 2^{3} \cdot 3 \)
\( J_6 \)  = \(13784\) =  \( 2^{3} \cdot 1723 \)
\( J_8 \)  = \(-537720\) =  \( - 2^{3} \cdot 3 \cdot 5 \cdot 4481 \)
\( J_{10} \)  = \(66161\) =  \( 66161 \)
\( g_1 \)  = \(-92389579776/66161\)
\( g_2 \)  = \(-91113984/66161\)
\( g_3 \)  = \(335447424/66161\)

magma: IgusaClebschInvariants(C); IgusaInvariants(C); G2Invariants(C);
 
sage: C.igusa_clebsch_invariants(); [factor(a) for a in _]
 

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
\((1 : -1 : 0)\) \((1 : 1 : 0)\) \((0 : 0 : 1)\) \((0 : -1 : 1)\) \((1 : 0 : 1)\) \((-1 : 1 : 1)\)
\((1 : -1 : 1)\) \((-1 : -2 : 1)\) \((-1 : -7 : 3)\) \((-2 : 9 : 1)\) \((-2 : -10 : 1)\) \((2 : 11 : 3)\)
\((-1 : -20 : 3)\) \((2 : -38 : 3)\)

magma: [C![-2,-10,1],C![-2,9,1],C![-1,-20,3],C![-1,-7,3],C![-1,-2,1],C![-1,1,1],C![0,-1,1],C![0,0,1],C![1,-1,0],C![1,-1,1],C![1,0,1],C![1,1,0],C![2,-38,3],C![2,11,3]];
 

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: \(\Z \times \Z \times \Z\)

magma: MordellWeilGroupGenus2(Jacobian(C));
 

Generator $D_0$ Height Order
\(D_0 - (1 : -1 : 0) - (1 : 1 : 0)\) \(x^2 - xz - z^2\) \(=\) \(0,\) \(y\) \(=\) \(0\) \(0.564970\) \(\infty\)
\((0 : -1 : 1) - (1 : -1 : 0)\) \(z x\) \(=\) \(0,\) \(y\) \(=\) \(x^3 - z^3\) \(0.366414\) \(\infty\)
\(2 \cdot(0 : 0 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) \(x^2\) \(=\) \(0,\) \(y\) \(=\) \(xz^2\) \(0.231439\) \(\infty\)

2-torsion field: 6.2.4234304.1

BSD invariants

Hasse-Weil conjecture: unverified
Analytic rank: \(3\)   (upper bound)
Mordell-Weil rank: \(3\)
2-Selmer rank:\(3\)
Regulator: \( 0.042579 \)
Real period: \( 18.10343 \)
Tamagawa product: \( 1 \)
Torsion order:\( 1 \)
Leading coefficient: \( 0.770840 \)
Analytic order of Ш: \( 1 \)   (rounded)
Order of Ш:square

Local invariants

Prime ord(\(N\)) ord(\(\Delta\)) Tamagawa L-factor
\(66161\) \(1\) \(1\) \(1\) \(( 1 - T )( 1 - 478 T + 66161 T^{2} )\)

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 \(\Q\).