Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + x + 1)y = x^5 - x^4 - 5x^3 + 9x + 6$ | (homogenize, simplify) |
$y^2 + (x^3 + xz^2 + z^3)y = x^5z - x^4z^2 - 5x^3z^3 + 9xz^5 + 6z^6$ | (dehomogenize, simplify) |
$y^2 = x^6 + 4x^5 - 2x^4 - 18x^3 + x^2 + 38x + 25$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([6, 9, 0, -5, -1, 1]), R([1, 1, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![6, 9, 0, -5, -1, 1], R![1, 1, 0, 1]);
sage: X = HyperellipticCurve(R([25, 38, 1, -18, -2, 4, 1]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(440509\) | \(=\) | \( 440509 \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(440509\) | \(=\) | \( 440509 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(1028\) | \(=\) | \( 2^{2} \cdot 257 \) |
\( I_4 \) | \(=\) | \(71593\) | \(=\) | \( 71593 \) |
\( I_6 \) | \(=\) | \(17110373\) | \(=\) | \( 7 \cdot 79 \cdot 30941 \) |
\( I_{10} \) | \(=\) | \(56385152\) | \(=\) | \( 2^{7} \cdot 440509 \) |
\( J_2 \) | \(=\) | \(257\) | \(=\) | \( 257 \) |
\( J_4 \) | \(=\) | \(-231\) | \(=\) | \( - 3 \cdot 7 \cdot 11 \) |
\( J_6 \) | \(=\) | \(14605\) | \(=\) | \( 5 \cdot 23 \cdot 127 \) |
\( J_8 \) | \(=\) | \(925031\) | \(=\) | \( 173 \cdot 5347 \) |
\( J_{10} \) | \(=\) | \(440509\) | \(=\) | \( 440509 \) |
\( g_1 \) | \(=\) | \(1121154893057/440509\) | ||
\( g_2 \) | \(=\) | \(-3921130983/440509\) | ||
\( g_3 \) | \(=\) | \(964645645/440509\) |
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 | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((-1 : 0 : 1)\) | \((-1 : 1 : 1)\) | \((0 : 2 : 1)\) | \((2 : 0 : 1)\) |
\((1 : 2 : 1)\) | \((0 : -3 : 1)\) | \((-2 : 4 : 1)\) | \((1 : -5 : 1)\) | \((-2 : 5 : 1)\) | \((7 : 5 : 3)\) |
\((-1 : 10 : 2)\) | \((-3 : 10 : 2)\) | \((2 : -11 : 1)\) | \((-1 : -13 : 2)\) | \((-3 : 14 : 1)\) | \((-3 : 15 : 1)\) |
\((-3 : 21 : 2)\) | \((-4 : 22 : 1)\) | \((-4 : 45 : 1)\) | \((-7 : 94 : 6)\) | \((-7 : 285 : 6)\) | \((7 : -438 : 3)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((-1 : 0 : 1)\) | \((-1 : 1 : 1)\) | \((0 : 2 : 1)\) | \((2 : 0 : 1)\) |
\((1 : 2 : 1)\) | \((0 : -3 : 1)\) | \((-2 : 4 : 1)\) | \((1 : -5 : 1)\) | \((-2 : 5 : 1)\) | \((7 : 5 : 3)\) |
\((-1 : 10 : 2)\) | \((-3 : 10 : 2)\) | \((2 : -11 : 1)\) | \((-1 : -13 : 2)\) | \((-3 : 14 : 1)\) | \((-3 : 15 : 1)\) |
\((-3 : 21 : 2)\) | \((-4 : 22 : 1)\) | \((-4 : 45 : 1)\) | \((-7 : 94 : 6)\) | \((-7 : 285 : 6)\) | \((7 : -438 : 3)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((-1 : -1 : 1)\) | \((-1 : 1 : 1)\) | \((-2 : -1 : 1)\) | \((-2 : 1 : 1)\) |
\((-3 : -1 : 1)\) | \((-3 : 1 : 1)\) | \((0 : -5 : 1)\) | \((0 : 5 : 1)\) | \((1 : -7 : 1)\) | \((1 : 7 : 1)\) |
\((2 : -11 : 1)\) | \((2 : 11 : 1)\) | \((-3 : -11 : 2)\) | \((-3 : 11 : 2)\) | \((-1 : -23 : 2)\) | \((-1 : 23 : 2)\) |
\((-4 : -23 : 1)\) | \((-4 : 23 : 1)\) | \((-7 : -191 : 6)\) | \((-7 : 191 : 6)\) | \((7 : -443 : 3)\) | \((7 : 443 : 3)\) |
magma: [C![-7,94,6],C![-7,285,6],C![-4,22,1],C![-4,45,1],C![-3,10,2],C![-3,14,1],C![-3,15,1],C![-3,21,2],C![-2,4,1],C![-2,5,1],C![-1,-13,2],C![-1,0,1],C![-1,1,1],C![-1,10,2],C![0,-3,1],C![0,2,1],C![1,-5,1],C![1,-1,0],C![1,0,0],C![1,2,1],C![2,-11,1],C![2,0,1],C![7,-438,3],C![7,5,3]]; // minimal model
magma: [C![-7,-191,6],C![-7,191,6],C![-4,-23,1],C![-4,23,1],C![-3,-11,2],C![-3,-1,1],C![-3,1,1],C![-3,11,2],C![-2,-1,1],C![-2,1,1],C![-1,-23,2],C![-1,-1,1],C![-1,1,1],C![-1,23,2],C![0,-5,1],C![0,5,1],C![1,-7,1],C![1,-1,0],C![1,1,0],C![1,7,1],C![2,-11,1],C![2,11,1],C![7,-443,3],C![7,443,3]]; // 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: \(\Z \oplus \Z \oplus \Z \oplus \Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x^2 - 2z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(z^3\) | \(1.072693\) | \(\infty\) |
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^2z\) | \(0.404197\) | \(\infty\) |
\((-2 : 4 : 1) - (1 : 0 : 0)\) | \(z (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 - 4z^3\) | \(0.548892\) | \(\infty\) |
\((-1 : 0 : 1) - (1 : -1 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.333349\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - (1 : -1 : 0) - (1 : 0 : 0)\) | \(x^2 - 2z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(z^3\) | \(1.072693\) | \(\infty\) |
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^2z\) | \(0.404197\) | \(\infty\) |
\((-2 : 4 : 1) - (1 : 0 : 0)\) | \(z (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 - 4z^3\) | \(0.548892\) | \(\infty\) |
\((-1 : 0 : 1) - (1 : -1 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(0\) | \(0.333349\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\(D_0 - (1 : -1 : 0) - (1 : 1 : 0)\) | \(x^2 - 2z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + xz^2 + 3z^3\) | \(1.072693\) | \(\infty\) |
\(D_0 - 2 \cdot(1 : -1 : 0)\) | \(z^2\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + 2x^2z + xz^2 + z^3\) | \(0.404197\) | \(\infty\) |
\((-2 : -1 : 1) - (1 : 1 : 0)\) | \(z (x + 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 + xz^2 - 7z^3\) | \(0.548892\) | \(\infty\) |
\((-1 : -1 : 1) - (1 : -1 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 + xz^2 + z^3\) | \(0.333349\) | \(\infty\) |
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(4\) (upper bound) |
Mordell-Weil rank: | \(4\) |
2-Selmer rank: | \(4\) |
Regulator: | \( 0.062575 \) |
Real period: | \( 17.94863 \) |
Tamagawa product: | \( 1 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 1.123153 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(440509\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 - 372 T + 440509 T^{2} )\) |
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);
Additional information
The conductor $440509$ of the Jacobian of this curve is the smallest known for a genus $2$ curve with analytic rank $4$.