Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + x^2 + 1)y = -2x^4 - 5x^3 + 5x + 2$ | (homogenize, simplify) |
$y^2 + (x^3 + x^2z + z^3)y = -2x^4z^2 - 5x^3z^3 + 5xz^5 + 2z^6$ | (dehomogenize, simplify) |
$y^2 = x^6 + 2x^5 - 7x^4 - 18x^3 + 2x^2 + 20x + 9$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([2, 5, 0, -5, -2]), R([1, 0, 1, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![2, 5, 0, -5, -2], R![1, 0, 1, 1]);
sage: X = HyperellipticCurve(R([9, 20, 2, -18, -7, 2, 1]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(6081\) | \(=\) | \( 3 \cdot 2027 \) | magma: Conductor(LSeries(C)); Factorization($1);
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Discriminant: | \( \Delta \) | \(=\) | \(164187\) | \(=\) | \( 3^{4} \cdot 2027 \) | magma: Discriminant(C); Factorization(Integers()!$1);
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Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(804\) | \(=\) | \( 2^{2} \cdot 3 \cdot 67 \) |
\( I_4 \) | \(=\) | \(62697\) | \(=\) | \( 3 \cdot 20899 \) |
\( I_6 \) | \(=\) | \(11560485\) | \(=\) | \( 3 \cdot 5 \cdot 797 \cdot 967 \) |
\( I_{10} \) | \(=\) | \(21015936\) | \(=\) | \( 2^{7} \cdot 3^{4} \cdot 2027 \) |
\( J_2 \) | \(=\) | \(201\) | \(=\) | \( 3 \cdot 67 \) |
\( J_4 \) | \(=\) | \(-929\) | \(=\) | \( -929 \) |
\( J_6 \) | \(=\) | \(4093\) | \(=\) | \( 4093 \) |
\( J_8 \) | \(=\) | \(-10087\) | \(=\) | \( - 7 \cdot 11 \cdot 131 \) |
\( J_{10} \) | \(=\) | \(164187\) | \(=\) | \( 3^{4} \cdot 2027 \) |
\( g_1 \) | \(=\) | \(4050375321/2027\) | ||
\( g_2 \) | \(=\) | \(-279408827/6081\) | ||
\( g_3 \) | \(=\) | \(18373477/18243\) |
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 | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((-1 : 0 : 1)\) | \((0 : 1 : 1)\) | \((1 : 0 : 1)\) | \((-1 : -1 : 1)\) |
\((-2 : 0 : 1)\) | \((-1 : 0 : 2)\) | \((0 : -2 : 1)\) | \((1 : -3 : 1)\) | \((-2 : 3 : 1)\) | \((-4 : 5 : 1)\) |
\((-1 : -9 : 2)\) | \((-4 : 42 : 1)\) | \((-13 : 112 : 6)\) | \((-13 : 855 : 6)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((-1 : 0 : 1)\) | \((0 : 1 : 1)\) | \((1 : 0 : 1)\) | \((-1 : -1 : 1)\) |
\((-2 : 0 : 1)\) | \((-1 : 0 : 2)\) | \((0 : -2 : 1)\) | \((1 : -3 : 1)\) | \((-2 : 3 : 1)\) | \((-4 : 5 : 1)\) |
\((-1 : -9 : 2)\) | \((-4 : 42 : 1)\) | \((-13 : 112 : 6)\) | \((-13 : 855 : 6)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((-1 : -1 : 1)\) | \((-1 : 1 : 1)\) | \((0 : -3 : 1)\) | \((0 : 3 : 1)\) |
\((1 : -3 : 1)\) | \((1 : 3 : 1)\) | \((-2 : -3 : 1)\) | \((-2 : 3 : 1)\) | \((-1 : -9 : 2)\) | \((-1 : 9 : 2)\) |
\((-4 : -37 : 1)\) | \((-4 : 37 : 1)\) | \((-13 : -743 : 6)\) | \((-13 : 743 : 6)\) |
magma: [C![-13,112,6],C![-13,855,6],C![-4,5,1],C![-4,42,1],C![-2,0,1],C![-2,3,1],C![-1,-9,2],C![-1,-1,1],C![-1,0,1],C![-1,0,2],C![0,-2,1],C![0,1,1],C![1,-3,1],C![1,-1,0],C![1,0,0],C![1,0,1]]; // minimal model
magma: [C![-13,-743,6],C![-13,743,6],C![-4,-37,1],C![-4,37,1],C![-2,-3,1],C![-2,3,1],C![-1,-9,2],C![-1,-1,1],C![-1,1,1],C![-1,9,2],C![0,-3,1],C![0,3,1],C![1,-3,1],C![1,-1,0],C![1,1,0],C![1,3,1]]; // 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: \(\Z \oplus \Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : 0 : 1) + (1 : 0 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.080053\) | \(\infty\) |
\((-2 : 3 : 1) + (-1 : 0 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) | \((x + z) (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-3xz^2 - 3z^3\) | \(0.044233\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : 0 : 1) + (1 : 0 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.080053\) | \(\infty\) |
\((-2 : 3 : 1) + (-1 : 0 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) | \((x + z) (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-3xz^2 - 3z^3\) | \(0.044233\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : 1 : 1) + (1 : 3 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + x^2z + z^3\) | \(0.080053\) | \(\infty\) |
\((-2 : 3 : 1) + (-1 : 1 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \((x + z) (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + x^2z - 6xz^2 - 5z^3\) | \(0.044233\) | \(\infty\) |
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(2\) |
Mordell-Weil rank: | \(2\) |
2-Selmer rank: | \(2\) |
Regulator: | \( 0.003504 \) |
Real period: | \( 20.37907 \) |
Tamagawa product: | \( 4 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 0.285653 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(3\) | \(1\) | \(4\) | \(4\) | \(( 1 - T )( 1 + 3 T + 3 T^{2} )\) | |
\(2027\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 - 52 T + 2027 T^{2} )\) |
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);