Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + x)y = x^5 - x^4 - x^3 + x^2 - 2x + 1$ | (homogenize, simplify) |
$y^2 + (x^3 + xz^2)y = x^5z - x^4z^2 - x^3z^3 + x^2z^4 - 2xz^5 + z^6$ | (dehomogenize, simplify) |
$y^2 = x^6 + 4x^5 - 2x^4 - 4x^3 + 5x^2 - 8x + 4$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([1, -2, 1, -1, -1, 1]), R([0, 1, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![1, -2, 1, -1, -1, 1], R![0, 1, 0, 1]);
sage: X = HyperellipticCurve(R([4, -8, 5, -4, -2, 4, 1]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(168328\) | \(=\) | \( 2^{3} \cdot 53 \cdot 397 \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(-336656\) | \(=\) | \( - 2^{4} \cdot 53 \cdot 397 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(496\) | \(=\) | \( 2^{4} \cdot 31 \) |
\( I_4 \) | \(=\) | \(3172\) | \(=\) | \( 2^{2} \cdot 13 \cdot 61 \) |
\( I_6 \) | \(=\) | \(816364\) | \(=\) | \( 2^{2} \cdot 409 \cdot 499 \) |
\( I_{10} \) | \(=\) | \(1346624\) | \(=\) | \( 2^{6} \cdot 53 \cdot 397 \) |
\( J_2 \) | \(=\) | \(248\) | \(=\) | \( 2^{3} \cdot 31 \) |
\( J_4 \) | \(=\) | \(2034\) | \(=\) | \( 2 \cdot 3^{2} \cdot 113 \) |
\( J_6 \) | \(=\) | \(-18980\) | \(=\) | \( - 2^{2} \cdot 5 \cdot 13 \cdot 73 \) |
\( J_8 \) | \(=\) | \(-2211049\) | \(=\) | \( - 19 \cdot 116371 \) |
\( J_{10} \) | \(=\) | \(336656\) | \(=\) | \( 2^{4} \cdot 53 \cdot 397 \) |
\( g_1 \) | \(=\) | \(58632501248/21041\) | ||
\( g_2 \) | \(=\) | \(1939036608/21041\) | ||
\( g_3 \) | \(=\) | \(-72959120/21041\) |
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);
|
\(\mathrm{Aut}(X_{\overline{\Q}})\) | \(\simeq\) | $C_2$ | magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
|
Rational points
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((0 : -1 : 1)\) | \((0 : 1 : 1)\) | \((-1 : -1 : 1)\) | \((1 : -1 : 1)\) |
\((1 : 1 : 2)\) | \((-1 : 3 : 1)\) | \((3 : -1 : 2)\) | \((1 : -6 : 2)\) | \((3 : -38 : 2)\) | \((-5 : 57 : 3)\) |
\((-8 : 83 : 1)\) | \((-5 : 113 : 3)\) | \((-8 : 437 : 1)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((0 : -1 : 1)\) | \((0 : 1 : 1)\) | \((-1 : -1 : 1)\) | \((1 : -1 : 1)\) |
\((1 : 1 : 2)\) | \((-1 : 3 : 1)\) | \((3 : -1 : 2)\) | \((1 : -6 : 2)\) | \((3 : -38 : 2)\) | \((-5 : 57 : 3)\) |
\((-8 : 83 : 1)\) | \((-5 : 113 : 3)\) | \((-8 : 437 : 1)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((1 : 0 : 1)\) | \((0 : -2 : 1)\) | \((0 : 2 : 1)\) | \((-1 : -4 : 1)\) |
\((-1 : 4 : 1)\) | \((1 : -7 : 2)\) | \((1 : 7 : 2)\) | \((3 : -37 : 2)\) | \((3 : 37 : 2)\) | \((-5 : -56 : 3)\) |
\((-5 : 56 : 3)\) | \((-8 : -354 : 1)\) | \((-8 : 354 : 1)\) |
magma: [C![-8,83,1],C![-8,437,1],C![-5,57,3],C![-5,113,3],C![-1,-1,1],C![-1,3,1],C![0,-1,1],C![0,1,1],C![1,-6,2],C![1,-1,0],C![1,-1,1],C![1,0,0],C![1,1,2],C![3,-38,2],C![3,-1,2]]; // minimal model
magma: [C![-8,-354,1],C![-8,354,1],C![-5,-56,3],C![-5,56,3],C![-1,-4,1],C![-1,4,1],C![0,-2,1],C![0,2,1],C![1,-7,2],C![1,-1,0],C![1,0,1],C![1,1,0],C![1,7,2],C![3,-37,2],C![3,37,2]]; // 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 | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x^2 + xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-2xz^2 + z^3\) | \(0.639768\) | \(\infty\) |
\((0 : -1 : 1) + (1 : -1 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.553094\) | \(\infty\) |
\((1 : -1 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.159908\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x^2 + xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-2xz^2 + z^3\) | \(0.639768\) | \(\infty\) |
\((0 : -1 : 1) + (1 : -1 : 1) - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.553094\) | \(\infty\) |
\((1 : -1 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-z^3\) | \(0.159908\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x^2 + xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 - 3xz^2 + 2z^3\) | \(0.639768\) | \(\infty\) |
\((0 : -2 : 1) + (1 : 0 : 1) - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + xz^2 - 2z^3\) | \(0.553094\) | \(\infty\) |
\((1 : 0 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + xz^2 - 2z^3\) | \(0.159908\) | \(\infty\) |
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(3\) (upper bound) |
Mordell-Weil rank: | \(3\) |
2-Selmer rank: | \(3\) |
Regulator: | \( 0.046316 \) |
Real period: | \( 15.56270 \) |
Tamagawa product: | \( 2 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 1.441610 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(3\) | \(4\) | \(2\) | \(1 + T + 2 T^{2}\) | |
\(53\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 - 4 T + 53 T^{2} )\) | |
\(397\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 + 24 T + 397 T^{2} )\) |
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);