Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^2 + x + 1)y = x^6 - 2x^4 + x^3 - 2x$ | (homogenize, simplify) |
$y^2 + (x^2z + xz^2 + z^3)y = x^6 - 2x^4z^2 + x^3z^3 - 2xz^5$ | (dehomogenize, simplify) |
$y^2 = 4x^6 - 7x^4 + 6x^3 + 3x^2 - 6x + 1$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, -2, 0, 1, -2, 0, 1]), R([1, 1, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, -2, 0, 1, -2, 0, 1], R![1, 1, 1]);
sage: X = HyperellipticCurve(R([1, -6, 3, 6, -7, 0, 4]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(53623\) | \(=\) | \( 53623 \) | magma: Conductor(LSeries(C)); Factorization($1);
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Discriminant: | \( \Delta \) | \(=\) | \(-53623\) | \(=\) | \( -53623 \) | magma: Discriminant(C); Factorization(Integers()!$1);
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Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(204\) | \(=\) | \( 2^{2} \cdot 3 \cdot 17 \) |
\( I_4 \) | \(=\) | \(-24519\) | \(=\) | \( - 3 \cdot 11 \cdot 743 \) |
\( I_6 \) | \(=\) | \(1305075\) | \(=\) | \( 3 \cdot 5^{2} \cdot 17401 \) |
\( I_{10} \) | \(=\) | \(6863744\) | \(=\) | \( 2^{7} \cdot 53623 \) |
\( J_2 \) | \(=\) | \(51\) | \(=\) | \( 3 \cdot 17 \) |
\( J_4 \) | \(=\) | \(1130\) | \(=\) | \( 2 \cdot 5 \cdot 113 \) |
\( J_6 \) | \(=\) | \(-32292\) | \(=\) | \( - 2^{2} \cdot 3^{3} \cdot 13 \cdot 23 \) |
\( J_8 \) | \(=\) | \(-730948\) | \(=\) | \( - 2^{2} \cdot 41 \cdot 4457 \) |
\( J_{10} \) | \(=\) | \(53623\) | \(=\) | \( 53623 \) |
\( g_1 \) | \(=\) | \(345025251/53623\) | ||
\( g_2 \) | \(=\) | \(149895630/53623\) | ||
\( g_3 \) | \(=\) | \(-83991492/53623\) |
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);
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\(\mathrm{Aut}(X_{\overline{\Q}})\) | \(\simeq\) | $C_2$ | magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
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Rational points
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((0 : 0 : 1)\) | \((-1 : 0 : 1)\) | \((0 : -1 : 1)\) | \((-1 : -1 : 1)\) |
\((1 : -1 : 1)\) | \((1 : -2 : 1)\) | \((-2 : 4 : 1)\) | \((-2 : -7 : 1)\) | \((4 : -7 : 3)\) | \((-1 : 13 : 3)\) |
\((-1 : -34 : 3)\) | \((4 : -104 : 3)\) | \((-10 : 945 : 1)\) | \((-10 : -1036 : 1)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((0 : 0 : 1)\) | \((-1 : 0 : 1)\) | \((0 : -1 : 1)\) | \((-1 : -1 : 1)\) |
\((1 : -1 : 1)\) | \((1 : -2 : 1)\) | \((-2 : 4 : 1)\) | \((-2 : -7 : 1)\) | \((4 : -7 : 3)\) | \((-1 : 13 : 3)\) |
\((-1 : -34 : 3)\) | \((4 : -104 : 3)\) | \((-10 : 945 : 1)\) | \((-10 : -1036 : 1)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -2 : 0)\) | \((1 : 2 : 0)\) | \((0 : -1 : 1)\) | \((0 : 1 : 1)\) | \((-1 : -1 : 1)\) | \((-1 : 1 : 1)\) |
\((1 : -1 : 1)\) | \((1 : 1 : 1)\) | \((-2 : -11 : 1)\) | \((-2 : 11 : 1)\) | \((-1 : -47 : 3)\) | \((-1 : 47 : 3)\) |
\((4 : -97 : 3)\) | \((4 : 97 : 3)\) | \((-10 : -1981 : 1)\) | \((-10 : 1981 : 1)\) |
magma: [C![-10,-1036,1],C![-10,945,1],C![-2,-7,1],C![-2,4,1],C![-1,-34,3],C![-1,-1,1],C![-1,0,1],C![-1,13,3],C![0,-1,1],C![0,0,1],C![1,-2,1],C![1,-1,0],C![1,-1,1],C![1,1,0],C![4,-104,3],C![4,-7,3]]; // minimal model
magma: [C![-10,-1981,1],C![-10,1981,1],C![-2,-11,1],C![-2,11,1],C![-1,-47,3],C![-1,-1,1],C![-1,1,1],C![-1,47,3],C![0,-1,1],C![0,1,1],C![1,-1,1],C![1,-2,0],C![1,1,1],C![1,2,0],C![4,-97,3],C![4,97,3]]; // simplified model
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: \(\Z \oplus \Z \oplus \Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : -1 : 1) - (1 : 1 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 - 2z^3\) | \(0.538631\) | \(\infty\) |
\((-1 : -1 : 1) + (1 : -1 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.267127\) | \(\infty\) |
\((-1 : -1 : 1) + (0 : -1 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.311205\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : -1 : 1) - (1 : 1 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 - 2z^3\) | \(0.538631\) | \(\infty\) |
\((-1 : -1 : 1) + (1 : -1 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.267127\) | \(\infty\) |
\((-1 : -1 : 1) + (0 : -1 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.311205\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : -1 : 1) - (1 : 2 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-2x^3 + x^2z + xz^2 - 3z^3\) | \(0.538631\) | \(\infty\) |
\((-1 : -1 : 1) + (1 : 1 : 1) - (1 : -2 : 0) - (1 : 2 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^2z + xz^2 - z^3\) | \(0.267127\) | \(\infty\) |
\((-1 : -1 : 1) + (0 : -1 : 1) - (1 : -2 : 0) - (1 : 2 : 0)\) | \(x (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^2z + xz^2 - z^3\) | \(0.311205\) | \(\infty\) |
2-torsion field: 6.4.3431872.1
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(3\) (upper bound) |
Mordell-Weil rank: | \(3\) |
2-Selmer rank: | \(3\) |
Regulator: | \( 0.041050 \) |
Real period: | \( 16.38656 \) |
Tamagawa product: | \( 1 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 0.672678 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(53623\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 - 48 T + 53623 T^{2} )\) |
Galois representations
The mod-$\ell$ Galois representation has maximal image \(\GSp(4,\F_\ell)\) for all primes \( \ell \) .
Sato-Tate group
\(\mathrm{ST}\) | \(\simeq\) | $\mathrm{USp}(4)$ |
\(\mathrm{ST}^0\) | \(\simeq\) | \(\mathrm{USp}(4)\) |
Decomposition of the Jacobian
Simple over \(\overline{\Q}\)
magma: HeuristicDecompositionFactors(C);
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 \(\Q\).
magma: //Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
magma: HeuristicIsGL2(C); HeuristicEndomorphismDescription(C); HeuristicEndomorphismFieldOfDefinition(C);
magma: HeuristicIsGL2(C : Geometric := true); HeuristicEndomorphismDescription(C : Geometric := true); HeuristicEndomorphismLatticeDescription(C);