Properties

Label 100283.a.100283.1
Conductor 100283
Discriminant -100283
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

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Minimal equation

Minimal equation

Simplified equation

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

sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, -1, 0, -1, -1, 1]), R([1, 0, 1]));
 
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, -1, 0, -1, -1, 1], R![1, 0, 1]);
 
sage: X = HyperellipticCurve(R([1, -4, 2, -4, -3, 4]))
 
magma: X,pi:= SimplifiedModel(C);
 

Invariants

Conductor: \( N \)  =  \(100283\) = \( 17^{2} \cdot 347 \)
magma: Conductor(LSeries(C)); Factorization($1);
 
Discriminant: \( \Delta \)  =  \(-100283\) = \( - 17^{2} \cdot 347 \)
magma: Discriminant(C); Factorization(Integers()!$1);
 

Igusa-Clebsch invariants

Igusa invariants

G2 invariants

\( I_2 \)  = \(-448\) =  \( - 2^{6} \cdot 7 \)
\( I_4 \)  = \(-30464\) =  \( - 2^{8} \cdot 7 \cdot 17 \)
\( I_6 \)  = \(1226176\) =  \( 2^{6} \cdot 7^{2} \cdot 17 \cdot 23 \)
\( I_{10} \)  = \(-410759168\) =  \( - 2^{12} \cdot 17^{2} \cdot 347 \)
\( J_2 \)  = \(-56\) =  \( - 2^{3} \cdot 7 \)
\( J_4 \)  = \(448\) =  \( 2^{6} \cdot 7 \)
\( J_6 \)  = \(2401\) =  \( 7^{4} \)
\( J_8 \)  = \(-83790\) =  \( - 2 \cdot 3^{2} \cdot 5 \cdot 7^{2} \cdot 19 \)
\( J_{10} \)  = \(-100283\) =  \( - 17^{2} \cdot 347 \)
\( g_1 \)  = \(550731776/100283\)
\( g_2 \)  = \(78675968/100283\)
\( g_3 \)  = \(-7529536/100283\)

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: \((1 : 0 : 0),\, (0 : 0 : 1),\, (-1 : 0 : 1),\, (0 : -1 : 1),\, (-1 : -2 : 1),\, (2 : 1 : 1),\, (2 : -6 : 1)\)

magma: [C![-1,-2,1],C![-1,0,1],C![0,-1,1],C![0,0,1],C![1,0,0],C![2,-6,1],C![2,1,1]];
 

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: \(\Z \times \Z\)

magma: MordellWeilGroupGenus2(Jacobian(C));
 

Generator $D_0$ Height Order
\((-1 : -2 : 1) + (0 : -1 : 1) - 2 \cdot(1 : 0 : 0)\) \(x (x + z)\) \(=\) \(0,\) \(y\) \(=\) \(xz^2 - z^3\) \(0.828166\) \(\infty\)
\((0 : -1 : 1) - (1 : 0 : 0)\) \(x\) \(=\) \(0,\) \(y\) \(=\) \(-z^3\) \(0.161159\) \(\infty\)

2-torsion field: 5.3.1604528.1

BSD invariants

Hasse-Weil conjecture: unverified
Analytic rank: \(2\)
Mordell-Weil rank: \(2\)
2-Selmer rank:\(2\)
Regulator: \( 0.132804 \)
Real period: \( 12.72782 \)
Tamagawa product: \( 1 \)
Torsion order:\( 1 \)
Leading coefficient: \( 1.690311 \)
Analytic order of Ш: \( 1 \)   (rounded)
Order of Ш:square

Local invariants

Prime ord(\(N\)) ord(\(\Delta\)) Tamagawa L-factor
\(17\) \(2\) \(2\) \(1\) \(1 + 2 T + 17 T^{2}\)
\(347\) \(1\) \(1\) \(1\) \(( 1 + T )( 1 - 15 T + 347 T^{2} )\)

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 \(\Q\).