Minimal equation
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![121, 0, 47, 0, 6], R![0, 0, 0, 1]);
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([121, 0, 47, 0, 6]), R([0, 0, 0, 1]))
$y^2 + x^3y = 6x^4 + 47x^2 + 121$
Invariants
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magma: Conductor(LSeries(C)); Factorization($1);
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| \( N \) | = | \( 968 \) | = | \( 2^{3} \cdot 11^{2} \) | |
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magma: Discriminant(C); Factorization(Integers()!$1);
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| \( \Delta \) | = | \(-234256\) | = | \( -1 \cdot 2^{4} \cdot 11^{4} \) | |
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);
| \( I_2 \) | = | \(-188352\) | = | \( -1 \cdot 2^{6} \cdot 3^{3} \cdot 109 \) |
| \( I_4 \) | = | \(391488\) | = | \( 2^{6} \cdot 3 \cdot 2039 \) |
| \( I_6 \) | = | \(-24399401472\) | = | \( -1 \cdot 2^{9} \cdot 3^{3} \cdot 379 \cdot 4657 \) |
| \( I_{10} \) | = | \(-959512576\) | = | \( -1 \cdot 2^{16} \cdot 11^{4} \) |
| \( J_2 \) | = | \(-23544\) | = | \( -1 \cdot 2^{3} \cdot 3^{3} \cdot 109 \) |
| \( J_4 \) | = | \(23092586\) | = | \( 2 \cdot 11 \cdot 1049663 \) |
| \( J_6 \) | = | \(-30194746560\) | = | \( -1 \cdot 2^{6} \cdot 3^{2} \cdot 5 \cdot 11^{3} \cdot 7877 \) |
| \( J_8 \) | = | \(44409396210311\) | = | \( 11^{2} \cdot 977 \cdot 2311 \cdot 162553 \) |
| \( J_{10} \) | = | \(-234256\) | = | \( -1 \cdot 2^{4} \cdot 11^{4} \) |
| \( g_1 \) | = | \(452148675314325387264/14641\) | ||
| \( g_2 \) | = | \(1712381980706754624/1331\) | ||
| \( g_3 \) | = | \(785948064456960/11\) |
Automorphism group
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magma: AutomorphismGroup(C); IdentifyGroup($1);
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| \(\mathrm{Aut}(X)\) | \(\simeq\) | \(V_4 \) | (GAP id : [4,2]) | ||
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magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
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| \(\mathrm{Aut}(X_{\overline{\Q}})\) | \(\simeq\) | \(V_4 \) | (GAP id : [4,2]) | ||
Rational points
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.
magma: [C![0,-11,1],C![0,11,1],C![1,-1,0],C![1,0,0]];
All rational points: (0 : -11 : 1), (0 : 11 : 1), (1 : -1 : 0), (1 : 0 : 0)
magma: #Roots(HyperellipticPolynomials(SimplifiedModel(C)));
Number of rational Weierstrass points: \(0\)
Invariants of the Jacobian:
Analytic rank: \(1\)
magma: TwoSelmerGroup(Jacobian(C)); NumberOfGenerators($1);
2-Selmer rank: \(1\)
magma: HasSquareSha(Jacobian(C));
Order of Ш*: square
Regulator: 0.0805287286738
Real period: 5.3973500501954841383337667378
Tamagawa numbers: 2 (p = 2), 5 (p = 11)
magma: TorsionSubgroup(Jacobian(SimplifiedModel(C))); AbelianInvariants($1);
Torsion: \(\Z/{5}\Z\)
Sato-Tate group
| \(\mathrm{ST}\) | \(\simeq\) | $G_{3,3}$ |
| \(\mathrm{ST}^0\) | \(\simeq\) | \(\mathrm{SU}(2)\times\mathrm{SU}(2)\) |
Decomposition
Splits over \(\Q\)
Decomposes up to isogeny as the product of the non-isogenous elliptic curves:
Elliptic curve 88.a1
Elliptic curve 11.a2
Endomorphisms
Of \(\GL_2\)-type over \(\Q\)
Endomorphism ring over \(\Q\):| \(\End (J_{})\) | \(\simeq\) | an order of index \(2\) in \(\Z \times \Z\) |
| \(\End (J_{}) \otimes \Q \) | \(\simeq\) | \(\Q\) \(\times\) \(\Q\) |
| \(\End (J_{}) \otimes \R\) | \(\simeq\) | \(\R \times \R\) |
All \(\overline{\Q}\)-endomorphisms of the Jacobian are defined over \(\Q\).