Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + x^2 + x + 1)y = -x^4 + 4x^2 + 2x$ | (homogenize, simplify) |
$y^2 + (x^3 + x^2z + xz^2 + z^3)y = -x^4z^2 + 4x^2z^4 + 2xz^5$ | (dehomogenize, simplify) |
$y^2 = x^6 + 2x^5 - x^4 + 4x^3 + 19x^2 + 10x + 1$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, 2, 4, 0, -1]), R([1, 1, 1, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, 2, 4, 0, -1], R![1, 1, 1, 1]);
sage: X = HyperellipticCurve(R([1, 10, 19, 4, -1, 2, 1]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(7884\) | \(=\) | \( 2^{2} \cdot 3^{3} \cdot 73 \) | magma: Conductor(LSeries(C)); Factorization($1);
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Discriminant: | \( \Delta \) | \(=\) | \(283824\) | \(=\) | \( 2^{4} \cdot 3^{5} \cdot 73 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(40\) | \(=\) | \( 2^{3} \cdot 5 \) |
\( I_4 \) | \(=\) | \(237\) | \(=\) | \( 3 \cdot 79 \) |
\( I_6 \) | \(=\) | \(1909\) | \(=\) | \( 23 \cdot 83 \) |
\( I_{10} \) | \(=\) | \(146\) | \(=\) | \( 2 \cdot 73 \) |
\( J_2 \) | \(=\) | \(120\) | \(=\) | \( 2^{3} \cdot 3 \cdot 5 \) |
\( J_4 \) | \(=\) | \(-822\) | \(=\) | \( - 2 \cdot 3 \cdot 137 \) |
\( J_6 \) | \(=\) | \(5584\) | \(=\) | \( 2^{4} \cdot 349 \) |
\( J_8 \) | \(=\) | \(-1401\) | \(=\) | \( - 3 \cdot 467 \) |
\( J_{10} \) | \(=\) | \(283824\) | \(=\) | \( 2^{4} \cdot 3^{5} \cdot 73 \) |
\( g_1 \) | \(=\) | \(6400000/73\) | ||
\( g_2 \) | \(=\) | \(-1096000/219\) | ||
\( g_3 \) | \(=\) | \(558400/1971\) |
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 | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((0 : 0 : 1)\) | \((0 : -1 : 1)\) | \((-1 : -1 : 1)\) | \((-1 : 1 : 1)\) |
\((1 : 1 : 1)\) | \((-2 : 1 : 1)\) | \((-1 : -1 : 2)\) | \((3 : -1 : 1)\) | \((-3 : 3 : 1)\) | \((-2 : 4 : 1)\) |
\((-1 : -4 : 2)\) | \((1 : -5 : 1)\) | \((-3 : 17 : 1)\) | \((3 : -39 : 1)\) | \((-13 : 2192 : 20)\) | \((-13 : -6175 : 20)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((0 : 0 : 1)\) | \((0 : -1 : 1)\) | \((-1 : -1 : 1)\) | \((-1 : 1 : 1)\) |
\((1 : 1 : 1)\) | \((-2 : 1 : 1)\) | \((-1 : -1 : 2)\) | \((3 : -1 : 1)\) | \((-3 : 3 : 1)\) | \((-2 : 4 : 1)\) |
\((-1 : -4 : 2)\) | \((1 : -5 : 1)\) | \((-3 : 17 : 1)\) | \((3 : -39 : 1)\) | \((-13 : 2192 : 20)\) | \((-13 : -6175 : 20)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((0 : -1 : 1)\) | \((0 : 1 : 1)\) | \((-1 : -2 : 1)\) | \((-1 : 2 : 1)\) |
\((-2 : -3 : 1)\) | \((-2 : 3 : 1)\) | \((-1 : -3 : 2)\) | \((-1 : 3 : 2)\) | \((1 : -6 : 1)\) | \((1 : 6 : 1)\) |
\((-3 : -14 : 1)\) | \((-3 : 14 : 1)\) | \((3 : -38 : 1)\) | \((3 : 38 : 1)\) | \((-13 : -8367 : 20)\) | \((-13 : 8367 : 20)\) |
magma: [C![-13,-6175,20],C![-13,2192,20],C![-3,3,1],C![-3,17,1],C![-2,1,1],C![-2,4,1],C![-1,-4,2],C![-1,-1,1],C![-1,-1,2],C![-1,1,1],C![0,-1,1],C![0,0,1],C![1,-5,1],C![1,-1,0],C![1,0,0],C![1,1,1],C![3,-39,1],C![3,-1,1]]; // minimal model
magma: [C![-13,-8367,20],C![-13,8367,20],C![-3,-14,1],C![-3,14,1],C![-2,-3,1],C![-2,3,1],C![-1,-3,2],C![-1,-2,1],C![-1,3,2],C![-1,2,1],C![0,-1,1],C![0,1,1],C![1,-6,1],C![1,-1,0],C![1,1,0],C![1,6,1],C![3,-38,1],C![3,38,1]]; // 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 | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : 1 : 1) - (1 : -1 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(z^3\) | \(0.059443\) | \(\infty\) |
\((0 : -1 : 1) + (1 : -5 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-4xz^2 - z^3\) | \(0.048591\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : 1 : 1) - (1 : -1 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(z^3\) | \(0.059443\) | \(\infty\) |
\((0 : -1 : 1) + (1 : -5 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-4xz^2 - z^3\) | \(0.048591\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : 2 : 1) - (1 : -1 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + x^2z + xz^2 + 3z^3\) | \(0.059443\) | \(\infty\) |
\((0 : -1 : 1) + (1 : -6 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + x^2z - 7xz^2 - z^3\) | \(0.048591\) | \(\infty\) |
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(2\) |
Mordell-Weil rank: | \(2\) |
2-Selmer rank: | \(2\) |
Regulator: | \( 0.002337 \) |
Real period: | \( 17.88540 \) |
Tamagawa product: | \( 9 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 0.376330 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(2\) | \(4\) | \(3\) | \(1 + 2 T + 2 T^{2}\) | |
\(3\) | \(3\) | \(5\) | \(3\) | \(1 + 3 T + 3 T^{2}\) | |
\(73\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 - T + 73 T^{2} )\) |
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);