Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + 1)y = x^5 - x^4 - 5x^3 + 4x^2 + 4x - 3$ | (homogenize, simplify) |
$y^2 + (x^3 + z^3)y = x^5z - x^4z^2 - 5x^3z^3 + 4x^2z^4 + 4xz^5 - 3z^6$ | (dehomogenize, simplify) |
$y^2 = x^6 + 4x^5 - 4x^4 - 18x^3 + 16x^2 + 16x - 11$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([-3, 4, 4, -5, -1, 1]), R([1, 0, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![-3, 4, 4, -5, -1, 1], R![1, 0, 0, 1]);
sage: X = HyperellipticCurve(R([-11, 16, 16, -18, -4, 4, 1]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(25570\) | \(=\) | \( 2 \cdot 5 \cdot 2557 \) | magma: Conductor(LSeries(C)); Factorization($1);
|
Discriminant: | \( \Delta \) | \(=\) | \(255700\) | \(=\) | \( 2^{2} \cdot 5^{2} \cdot 2557 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(4084\) | \(=\) | \( 2^{2} \cdot 1021 \) |
\( I_4 \) | \(=\) | \(60001\) | \(=\) | \( 29 \cdot 2069 \) |
\( I_6 \) | \(=\) | \(62743873\) | \(=\) | \( 62743873 \) |
\( I_{10} \) | \(=\) | \(32729600\) | \(=\) | \( 2^{9} \cdot 5^{2} \cdot 2557 \) |
\( J_2 \) | \(=\) | \(1021\) | \(=\) | \( 1021 \) |
\( J_4 \) | \(=\) | \(40935\) | \(=\) | \( 3 \cdot 5 \cdot 2729 \) |
\( J_6 \) | \(=\) | \(2301329\) | \(=\) | \( 103 \cdot 22343 \) |
\( J_8 \) | \(=\) | \(168495671\) | \(=\) | \( 8893 \cdot 18947 \) |
\( J_{10} \) | \(=\) | \(255700\) | \(=\) | \( 2^{2} \cdot 5^{2} \cdot 2557 \) |
\( g_1 \) | \(=\) | \(1109503586489101/255700\) | ||
\( g_2 \) | \(=\) | \(8713688220807/51140\) | ||
\( g_3 \) | \(=\) | \(2398999704089/255700\) |
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 | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((-1 : 0 : 1)\) | \((1 : 0 : 1)\) | \((1 : -2 : 1)\) | \((3 : -5 : 2)\) |
\((-3 : 12 : 1)\) | \((-3 : 14 : 1)\) | \((-5 : -24 : 3)\) | \((3 : -30 : 2)\) | \((-11 : -75 : 6)\) | \((-5 : 122 : 3)\) |
\((-11 : 1190 : 6)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((-1 : 0 : 1)\) | \((1 : 0 : 1)\) | \((1 : -2 : 1)\) | \((3 : -5 : 2)\) |
\((-3 : 12 : 1)\) | \((-3 : 14 : 1)\) | \((-5 : -24 : 3)\) | \((3 : -30 : 2)\) | \((-11 : -75 : 6)\) | \((-5 : 122 : 3)\) |
\((-11 : 1190 : 6)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((-1 : 0 : 1)\) | \((1 : -2 : 1)\) | \((1 : 2 : 1)\) | \((-3 : -2 : 1)\) |
\((-3 : 2 : 1)\) | \((3 : -25 : 2)\) | \((3 : 25 : 2)\) | \((-5 : -146 : 3)\) | \((-5 : 146 : 3)\) | \((-11 : -1265 : 6)\) |
\((-11 : 1265 : 6)\) |
magma: [C![-11,-75,6],C![-11,1190,6],C![-5,-24,3],C![-5,122,3],C![-3,12,1],C![-3,14,1],C![-1,0,1],C![1,-2,1],C![1,-1,0],C![1,0,0],C![1,0,1],C![3,-30,2],C![3,-5,2]]; // minimal model
magma: [C![-11,-1265,6],C![-11,1265,6],C![-5,-146,3],C![-5,146,3],C![-3,-2,1],C![-3,2,1],C![-1,0,1],C![1,-2,1],C![1,-1,0],C![1,1,0],C![1,2,1],C![3,-25,2],C![3,25,2]]; // 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: \(\Z \oplus \Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((1 : -2 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-2z^3\) | \(0.448852\) | \(\infty\) |
\((-1 : 0 : 1) - (1 : 0 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 - z^3\) | \(0.034669\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((1 : -2 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-2z^3\) | \(0.448852\) | \(\infty\) |
\((-1 : 0 : 1) - (1 : 0 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 - z^3\) | \(0.034669\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((1 : -2 : 1) - (1 : -1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(x^3 - 3z^3\) | \(0.448852\) | \(\infty\) |
\((-1 : 0 : 1) - (1 : 1 : 0)\) | \(z (x + z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 - z^3\) | \(0.034669\) | \(\infty\) |
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(2\) |
Mordell-Weil rank: | \(2\) |
2-Selmer rank: | \(2\) |
Regulator: | \( 0.015541 \) |
Real period: | \( 15.87321 \) |
Tamagawa product: | \( 4 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 0.986763 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(1\) | \(2\) | \(2\) | \(( 1 + T )( 1 - T + 2 T^{2} )\) | |
\(5\) | \(1\) | \(2\) | \(2\) | \(( 1 - T )( 1 + 4 T + 5 T^{2} )\) | |
\(2557\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 + 7 T + 2557 T^{2} )\) |
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);