Properties

Label 1091.a.1091.1
Conductor 1091
Discriminant 1091
Mordell-Weil group \(\Z \times \Z/{7}\Z\)
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

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

magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, 0, -1, -2, 0, 1], R![1, 1, 1]);
 
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([1, 2, -1, -6, 1, 4]))
 

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

Invariants

\( N \)  =  \(1091\) = \( 1091 \)
magma: Conductor(LSeries(C)); Factorization($1);
 
\( \Delta \)  =  \(1091\) = \( 1091 \)
magma: Discriminant(C); Factorization(Integers()!$1);
 

Igusa-Clebsch invariants

magma: IgusaClebschInvariants(C); [Factorization(Integers()!a): a in $1];
 
sage: C.igusa_clebsch_invariants(); [factor(a) for a in _]
 

Igusa invariants

magma: IgusaInvariants(C); [Factorization(Integers()!a): a in $1];
 

G2 invariants

magma: G2Invariants(C);
 

\( I_2 \)  = \(552\) =  \( 2^{3} \cdot 3 \cdot 23 \)
\( I_4 \)  = \(5220\) =  \( 2^{2} \cdot 3^{2} \cdot 5 \cdot 29 \)
\( I_6 \)  = \(342504\) =  \( 2^{3} \cdot 3^{2} \cdot 67 \cdot 71 \)
\( I_{10} \)  = \(4468736\) =  \( 2^{12} \cdot 1091 \)
\( J_2 \)  = \(69\) =  \( 3 \cdot 23 \)
\( J_4 \)  = \(144\) =  \( 2^{4} \cdot 3^{2} \)
\( J_6 \)  = \(1208\) =  \( 2^{3} \cdot 151 \)
\( J_8 \)  = \(15654\) =  \( 2 \cdot 3 \cdot 2609 \)
\( J_{10} \)  = \(1091\) =  \( 1091 \)
\( g_1 \)  = \(1564031349/1091\)
\( g_2 \)  = \(47305296/1091\)
\( g_3 \)  = \(5751288/1091\)

Automorphism group

magma: AutomorphismGroup(C); IdentifyGroup($1);
 
\(\mathrm{Aut}(X)\)\(\simeq\) $C_2$
magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
 
\(\mathrm{Aut}(X_{\overline{\Q}})\)\(\simeq\) $C_2$

Rational points

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

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

magma: #Roots(HyperellipticPolynomials(SimplifiedModel(C)));
 

Number of rational Weierstrass points: \(1\)

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);
 

This curve is locally solvable everywhere.

Mordell-Weil group of the Jacobian:

magma: MordellWeilGroupGenus2(Jacobian(C));
 

Group structure: \(\Z \times \Z/{7}\Z\)

Generator Height Order
\(x + z\) \(=\) \(0,\) \(y\) \(=\) \(-z^3\) \(0.339399\) \(\infty\)
\(x\) \(=\) \(0,\) \(y\) \(=\) \(0\) \(0\) \(7\)

2-torsion field: 5.1.17456.1

BSD invariants

Analytic rank: \(1\)   (upper bound)
Mordell-Weil rank: \(1\)
2-Selmer rank:\(1\)
Regulator: \( 0.339399 \)
Real period: \( 27.50656 \)
Tamagawa product: \( 1 \)
Torsion order:\( 7 \)
Leading coefficient: \( 0.190524 \)
Analytic order of Ш: \( 1 \)   (rounded)
Order of Ш:square

Local invariants

Prime ord(\(N\)) ord(\(\Delta\)) Tamagawa L-factor
\(1091\) \(1\) \(1\) \(1\) \(( 1 - T )( 1 + 21 T + 1091 T^{2} )\)

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 \(\Q\).