Minimal equation
Minimal equation
Simplified equation
$y^2 + xy = x^5 - x^3 - x^2 + 1$ | (homogenize, simplify) |
$y^2 + xz^2y = x^5z - x^3z^3 - x^2z^4 + z^6$ | (dehomogenize, simplify) |
$y^2 = 4x^5 - 4x^3 - 3x^2 + 4$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([1, 0, -1, -1, 0, 1]), R([0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![1, 0, -1, -1, 0, 1], R![0, 1]);
sage: X = HyperellipticCurve(R([4, 0, -3, -4, 0, 4]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(166319\) | \(=\) | \( 166319 \) | magma: Conductor(LSeries(C)); Factorization($1);
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Discriminant: | \( \Delta \) | \(=\) | \(166319\) | \(=\) | \( 166319 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(24\) | \(=\) | \( 2^{3} \cdot 3 \) |
\( I_4 \) | \(=\) | \(-3492\) | \(=\) | \( - 2^{2} \cdot 3^{2} \cdot 97 \) |
\( I_6 \) | \(=\) | \(-159705\) | \(=\) | \( - 3^{3} \cdot 5 \cdot 7 \cdot 13^{2} \) |
\( I_{10} \) | \(=\) | \(665276\) | \(=\) | \( 2^{2} \cdot 166319 \) |
\( J_2 \) | \(=\) | \(12\) | \(=\) | \( 2^{2} \cdot 3 \) |
\( J_4 \) | \(=\) | \(588\) | \(=\) | \( 2^{2} \cdot 3 \cdot 7^{2} \) |
\( J_6 \) | \(=\) | \(15809\) | \(=\) | \( 15809 \) |
\( J_8 \) | \(=\) | \(-39009\) | \(=\) | \( - 3 \cdot 13003 \) |
\( J_{10} \) | \(=\) | \(166319\) | \(=\) | \( 166319 \) |
\( g_1 \) | \(=\) | \(248832/166319\) | ||
\( g_2 \) | \(=\) | \(1016064/166319\) | ||
\( g_3 \) | \(=\) | \(2276496/166319\) |
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 | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((-1 : 0 : 1)\) | \((0 : -1 : 1)\) | \((0 : 1 : 1)\) | \((1 : 0 : 1)\) | \((-1 : 1 : 1)\) |
\((1 : -1 : 1)\) | \((3 : 13 : 1)\) | \((3 : -16 : 1)\) | \((1 : 54 : 4)\) | \((1 : -70 : 4)\) | \((-8 : -219 : 9)\) |
\((9 : 350 : 4)\) | \((9 : -494 : 4)\) | \((-8 : 867 : 9)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((-1 : 0 : 1)\) | \((0 : -1 : 1)\) | \((0 : 1 : 1)\) | \((1 : 0 : 1)\) | \((-1 : 1 : 1)\) |
\((1 : -1 : 1)\) | \((3 : 13 : 1)\) | \((3 : -16 : 1)\) | \((1 : 54 : 4)\) | \((1 : -70 : 4)\) | \((-8 : -219 : 9)\) |
\((9 : 350 : 4)\) | \((9 : -494 : 4)\) | \((-8 : 867 : 9)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((-1 : -1 : 1)\) | \((-1 : 1 : 1)\) | \((1 : -1 : 1)\) | \((1 : 1 : 1)\) | \((0 : -2 : 1)\) |
\((0 : 2 : 1)\) | \((3 : -29 : 1)\) | \((3 : 29 : 1)\) | \((1 : -124 : 4)\) | \((1 : 124 : 4)\) | \((9 : -844 : 4)\) |
\((9 : 844 : 4)\) | \((-8 : -1086 : 9)\) | \((-8 : 1086 : 9)\) |
magma: [C![-8,-219,9],C![-8,867,9],C![-1,0,1],C![-1,1,1],C![0,-1,1],C![0,1,1],C![1,-70,4],C![1,-1,1],C![1,0,0],C![1,0,1],C![1,54,4],C![3,-16,1],C![3,13,1],C![9,-494,4],C![9,350,4]]; // minimal model
magma: [C![-8,-1086,9],C![-8,1086,9],C![-1,-1,1],C![-1,1,1],C![0,-2,1],C![0,2,1],C![1,-124,4],C![1,-1,1],C![1,0,0],C![1,1,1],C![1,124,4],C![3,-29,1],C![3,29,1],C![9,-844,4],C![9,844,4]]; // simplified model
Number of rational Weierstrass points: \(1\)
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 | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : 0 : 1) + (1 : 0 : 1) - 2 \cdot(1 : 0 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.496922\) | \(\infty\) |
\((1 : -1 : 1) - (1 : 0 : 0)\) | \(x - z\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.442067\) | \(\infty\) |
\((0 : -1 : 1) - (1 : 0 : 0)\) | \(x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.519445\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : 0 : 1) + (1 : 0 : 1) - 2 \cdot(1 : 0 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.496922\) | \(\infty\) |
\((1 : -1 : 1) - (1 : 0 : 0)\) | \(x - z\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.442067\) | \(\infty\) |
\((0 : -1 : 1) - (1 : 0 : 0)\) | \(x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.519445\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((-1 : -1 : 1) + (1 : 1 : 1) - 2 \cdot(1 : 0 : 0)\) | \((x - z) (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(xz^2\) | \(0.496922\) | \(\infty\) |
\((1 : -1 : 1) - (1 : 0 : 0)\) | \(x - z\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(xz^2 - 2z^3\) | \(0.442067\) | \(\infty\) |
\((0 : -2 : 1) - (1 : 0 : 0)\) | \(x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(xz^2 - 2z^3\) | \(0.519445\) | \(\infty\) |
2-torsion field: 5.1.2661104.1
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(3\) (upper bound) |
Mordell-Weil rank: | \(3\) |
2-Selmer rank: | \(3\) |
Regulator: | \( 0.105549 \) |
Real period: | \( 13.82065 \) |
Tamagawa product: | \( 1 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 1.458762 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(166319\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 - 554 T + 166319 T^{2} )\) |
Galois representations
The mod-$\ell$ Galois representation has maximal image \(\GSp(4,\F_\ell)\) for all primes \( \ell \) except those listed.
Prime \(\ell\) | mod-\(\ell\) image | Is torsion prime? |
---|---|---|
\(2\) | 2.6.1 | no |
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);