Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + 1)y = -2x^4 + x^3 + 4x^2 - 3x$ | (homogenize, simplify) |
$y^2 + (x^3 + z^3)y = -2x^4z^2 + x^3z^3 + 4x^2z^4 - 3xz^5$ | (dehomogenize, simplify) |
$y^2 = x^6 - 8x^4 + 6x^3 + 16x^2 - 12x + 1$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, -3, 4, 1, -2]), R([1, 0, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, -3, 4, 1, -2], R![1, 0, 0, 1]);
sage: X = HyperellipticCurve(R([1, -12, 16, 6, -8, 0, 1]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(70450\) | \(=\) | \( 2 \cdot 5^{2} \cdot 1409 \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(-704500\) | \(=\) | \( - 2^{2} \cdot 5^{3} \cdot 1409 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(1012\) | \(=\) | \( 2^{2} \cdot 11 \cdot 23 \) |
\( I_4 \) | \(=\) | \(58105\) | \(=\) | \( 5 \cdot 11621 \) |
\( I_6 \) | \(=\) | \(13468045\) | \(=\) | \( 5 \cdot 2693609 \) |
\( I_{10} \) | \(=\) | \(-90176000\) | \(=\) | \( - 2^{9} \cdot 5^{3} \cdot 1409 \) |
\( J_2 \) | \(=\) | \(253\) | \(=\) | \( 11 \cdot 23 \) |
\( J_4 \) | \(=\) | \(246\) | \(=\) | \( 2 \cdot 3 \cdot 41 \) |
\( J_6 \) | \(=\) | \(20576\) | \(=\) | \( 2^{5} \cdot 643 \) |
\( J_8 \) | \(=\) | \(1286303\) | \(=\) | \( 1286303 \) |
\( J_{10} \) | \(=\) | \(-704500\) | \(=\) | \( - 2^{2} \cdot 5^{3} \cdot 1409 \) |
\( g_1 \) | \(=\) | \(-1036579476493/704500\) | ||
\( g_2 \) | \(=\) | \(-1991896071/352250\) | ||
\( g_3 \) | \(=\) | \(-329262296/176125\) |
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 | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((0 : 0 : 1)\) | \((0 : -1 : 1)\) | \((1 : 0 : 1)\) | \((-1 : -2 : 1)\) |
\((-1 : 2 : 1)\) | \((1 : -2 : 1)\) | \((2 : -2 : 1)\) | \((-3 : 0 : 2)\) | \((2 : -7 : 1)\) | \((-3 : 8 : 1)\) |
\((-1 : 9 : 2)\) | \((2 : -9 : 3)\) | \((-1 : -16 : 2)\) | \((-3 : 18 : 1)\) | \((-3 : 19 : 2)\) | \((2 : -26 : 3)\) |
\((10 : -145 : 3)\) | \((10 : -882 : 3)\) | \((29 : -1314 : 5)\) | \((29 : -23200 : 5)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((0 : 0 : 1)\) | \((0 : -1 : 1)\) | \((1 : 0 : 1)\) | \((-1 : -2 : 1)\) |
\((-1 : 2 : 1)\) | \((1 : -2 : 1)\) | \((2 : -2 : 1)\) | \((-3 : 0 : 2)\) | \((2 : -7 : 1)\) | \((-3 : 8 : 1)\) |
\((-1 : 9 : 2)\) | \((2 : -9 : 3)\) | \((-1 : -16 : 2)\) | \((-3 : 18 : 1)\) | \((-3 : 19 : 2)\) | \((2 : -26 : 3)\) |
\((10 : -145 : 3)\) | \((10 : -882 : 3)\) | \((29 : -1314 : 5)\) | \((29 : -23200 : 5)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((0 : -1 : 1)\) | \((0 : 1 : 1)\) | \((1 : -2 : 1)\) | \((1 : 2 : 1)\) |
\((-1 : -4 : 1)\) | \((-1 : 4 : 1)\) | \((2 : -5 : 1)\) | \((2 : 5 : 1)\) | \((-3 : -10 : 1)\) | \((-3 : 10 : 1)\) |
\((2 : -17 : 3)\) | \((2 : 17 : 3)\) | \((-3 : -19 : 2)\) | \((-3 : 19 : 2)\) | \((-1 : -25 : 2)\) | \((-1 : 25 : 2)\) |
\((10 : -737 : 3)\) | \((10 : 737 : 3)\) | \((29 : -21886 : 5)\) | \((29 : 21886 : 5)\) |
magma: [C![-3,0,2],C![-3,8,1],C![-3,18,1],C![-3,19,2],C![-1,-16,2],C![-1,-2,1],C![-1,2,1],C![-1,9,2],C![0,-1,1],C![0,0,1],C![1,-2,1],C![1,-1,0],C![1,0,0],C![1,0,1],C![2,-26,3],C![2,-9,3],C![2,-7,1],C![2,-2,1],C![10,-882,3],C![10,-145,3],C![29,-23200,5],C![29,-1314,5]]; // minimal model
magma: [C![-3,-19,2],C![-3,-10,1],C![-3,10,1],C![-3,19,2],C![-1,-25,2],C![-1,-4,1],C![-1,4,1],C![-1,25,2],C![0,-1,1],C![0,1,1],C![1,-2,1],C![1,-1,0],C![1,1,0],C![1,2,1],C![2,-17,3],C![2,17,3],C![2,-5,1],C![2,5,1],C![10,-737,3],C![10,737,3],C![29,-21886,5],C![29,21886,5]]; // 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: \(\Z \oplus \Z \oplus \Z \oplus \Z/{2}\Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) - (1 : -1 : 0)\) | \(z x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.446544\) | \(\infty\) |
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.411611\) | \(\infty\) |
\((1 : -2 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-2z^3\) | \(0.300988\) | \(\infty\) |
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x^2 + xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-xz^2\) | \(0\) | \(2\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 0 : 1) - (1 : -1 : 0)\) | \(z x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.446544\) | \(\infty\) |
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.411611\) | \(\infty\) |
\((1 : -2 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-2z^3\) | \(0.300988\) | \(\infty\) |
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x^2 + xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-xz^2\) | \(0\) | \(2\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((0 : 1 : 1) - (1 : -1 : 0)\) | \(z x\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + z^3\) | \(0.446544\) | \(\infty\) |
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + z^3\) | \(0.411611\) | \(\infty\) |
\((1 : -2 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 - 3z^3\) | \(0.300988\) | \(\infty\) |
\(D_0 - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x^2 + xz - z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 - 2xz^2 + z^3\) | \(0\) | \(2\) |
2-torsion field: 6.2.3970562000.2
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(3\) (upper bound) |
Mordell-Weil rank: | \(3\) |
2-Selmer rank: | \(4\) |
Regulator: | \( 0.046457 \) |
Real period: | \( 16.52129 \) |
Tamagawa product: | \( 4 \) |
Torsion order: | \( 2 \) |
Leading coefficient: | \( 0.767540 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(1\) | \(2\) | \(2\) | \(( 1 + T )( 1 + T + 2 T^{2} )\) | |
\(5\) | \(2\) | \(3\) | \(2\) | \(1 + 3 T + 5 T^{2}\) | |
\(1409\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 + 10 T + 1409 T^{2} )\) |
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? |
---|---|---|
\(2\) | 2.15.1 | yes |
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);