Minimal equation
Minimal equation
Simplified equation
$y^2 + (x^3 + 1)y = -x^5 + x^4 + x^2 - 7x + 6$ | (homogenize, simplify) |
$y^2 + (x^3 + z^3)y = -x^5z + x^4z^2 + x^2z^4 - 7xz^5 + 6z^6$ | (dehomogenize, simplify) |
$y^2 = x^6 - 4x^5 + 4x^4 + 2x^3 + 4x^2 - 28x + 25$ | (homogenize, minimize) |
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([6, -7, 1, 0, 1, -1]), R([1, 0, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![6, -7, 1, 0, 1, -1], R![1, 0, 0, 1]);
sage: X = HyperellipticCurve(R([25, -28, 4, 2, 4, -4, 1]))
magma: X,pi:= SimplifiedModel(C);
Invariants
Conductor: | \( N \) | \(=\) | \(83422\) | \(=\) | \( 2 \cdot 53 \cdot 787 \) | magma: Conductor(LSeries(C)); Factorization($1);
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Discriminant: | \( \Delta \) | \(=\) | \(166844\) | \(=\) | \( 2^{2} \cdot 53 \cdot 787 \) | magma: Discriminant(C); Factorization(Integers()!$1);
|
Igusa-Clebsch invariants
Igusa invariants
G2 invariants
\( I_2 \) | \(=\) | \(876\) | \(=\) | \( 2^{2} \cdot 3 \cdot 73 \) |
\( I_4 \) | \(=\) | \(12345\) | \(=\) | \( 3 \cdot 5 \cdot 823 \) |
\( I_6 \) | \(=\) | \(4168563\) | \(=\) | \( 3 \cdot 7 \cdot 198503 \) |
\( I_{10} \) | \(=\) | \(-21356032\) | \(=\) | \( - 2^{9} \cdot 53 \cdot 787 \) |
\( J_2 \) | \(=\) | \(219\) | \(=\) | \( 3 \cdot 73 \) |
\( J_4 \) | \(=\) | \(1484\) | \(=\) | \( 2^{2} \cdot 7 \cdot 53 \) |
\( J_6 \) | \(=\) | \(-2292\) | \(=\) | \( - 2^{2} \cdot 3 \cdot 191 \) |
\( J_8 \) | \(=\) | \(-676051\) | \(=\) | \( -676051 \) |
\( J_{10} \) | \(=\) | \(-166844\) | \(=\) | \( - 2^{2} \cdot 53 \cdot 787 \) |
\( g_1 \) | \(=\) | \(-503756397099/166844\) | ||
\( g_2 \) | \(=\) | \(-73524213/787\) | ||
\( g_3 \) | \(=\) | \(27481653/41711\) |
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 | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((1 : 0 : 1)\) | \((0 : 2 : 1)\) | \((1 : -2 : 1)\) | \((0 : -3 : 1)\) |
\((-1 : -4 : 1)\) | \((-1 : 4 : 1)\) | \((2 : -4 : 1)\) | \((2 : -5 : 1)\) | \((-3 : -10 : 1)\) | \((3 : -17 : 2)\) |
\((3 : -18 : 2)\) | \((-3 : 36 : 1)\) | \((7 : -142 : 3)\) | \((8 : -185 : 3)\) | \((7 : -228 : 3)\) | \((8 : -354 : 3)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : 0 : 0)\) | \((1 : -1 : 0)\) | \((1 : 0 : 1)\) | \((0 : 2 : 1)\) | \((1 : -2 : 1)\) | \((0 : -3 : 1)\) |
\((-1 : -4 : 1)\) | \((-1 : 4 : 1)\) | \((2 : -4 : 1)\) | \((2 : -5 : 1)\) | \((-3 : -10 : 1)\) | \((3 : -17 : 2)\) |
\((3 : -18 : 2)\) | \((-3 : 36 : 1)\) | \((7 : -142 : 3)\) | \((8 : -185 : 3)\) | \((7 : -228 : 3)\) | \((8 : -354 : 3)\) |
Known points | |||||
---|---|---|---|---|---|
\((1 : -1 : 0)\) | \((1 : 1 : 0)\) | \((1 : -2 : 1)\) | \((1 : 2 : 1)\) | \((2 : -1 : 1)\) | \((2 : 1 : 1)\) |
\((3 : -1 : 2)\) | \((3 : 1 : 2)\) | \((0 : -5 : 1)\) | \((0 : 5 : 1)\) | \((-1 : -8 : 1)\) | \((-1 : 8 : 1)\) |
\((-3 : -46 : 1)\) | \((-3 : 46 : 1)\) | \((7 : -86 : 3)\) | \((7 : 86 : 3)\) | \((8 : -169 : 3)\) | \((8 : 169 : 3)\) |
magma: [C![-3,-10,1],C![-3,36,1],C![-1,-4,1],C![-1,4,1],C![0,-3,1],C![0,2,1],C![1,-2,1],C![1,-1,0],C![1,0,0],C![1,0,1],C![2,-5,1],C![2,-4,1],C![3,-18,2],C![3,-17,2],C![7,-228,3],C![7,-142,3],C![8,-354,3],C![8,-185,3]]; // minimal model
magma: [C![-3,-46,1],C![-3,46,1],C![-1,-8,1],C![-1,8,1],C![0,-5,1],C![0,5,1],C![1,-2,1],C![1,-1,0],C![1,1,0],C![1,2,1],C![2,-1,1],C![2,1,1],C![3,-1,2],C![3,1,2],C![7,-86,3],C![7,86,3],C![8,-169,3],C![8,169,3]]; // 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: \(\Z \oplus \Z \oplus \Z\)
magma: MordellWeilGroupGenus2(Jacobian(C));
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((1 : 0 : 1) - (1 : 0 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 + z^3\) | \(0.363641\) | \(\infty\) |
\((2 : -5 : 1) - (1 : 0 : 0)\) | \(z (x - 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 + 3z^3\) | \(0.323642\) | \(\infty\) |
\((1 : -2 : 1) - (1 : 0 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 - z^3\) | \(0.235621\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((1 : 0 : 1) - (1 : 0 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 + z^3\) | \(0.363641\) | \(\infty\) |
\((2 : -5 : 1) - (1 : 0 : 0)\) | \(z (x - 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 + 3z^3\) | \(0.323642\) | \(\infty\) |
\((1 : -2 : 1) - (1 : 0 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 - z^3\) | \(0.235621\) | \(\infty\) |
Generator | $D_0$ | Height | Order | |||||
---|---|---|---|---|---|---|---|---|
\((1 : 2 : 1) - (1 : 1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 + 3z^3\) | \(0.363641\) | \(\infty\) |
\((2 : -1 : 1) - (1 : 1 : 0)\) | \(z (x - 2z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 + 7z^3\) | \(0.323642\) | \(\infty\) |
\((1 : -2 : 1) - (1 : 1 : 0)\) | \(z (x - z)\) | \(=\) | \(0,\) | \(y\) | \(=\) | \(-x^3 - z^3\) | \(0.235621\) | \(\infty\) |
BSD invariants
Hasse-Weil conjecture: | unverified |
Analytic rank: | \(3\) (upper bound) |
Mordell-Weil rank: | \(3\) |
2-Selmer rank: | \(3\) |
Regulator: | \( 0.025288 \) |
Real period: | \( 16.09825 \) |
Tamagawa product: | \( 2 \) |
Torsion order: | \( 1 \) |
Leading coefficient: | \( 0.814204 \) |
Analytic order of Ш: | \( 1 \) (rounded) |
Order of Ш: | square |
Local invariants
Prime | ord(\(N\)) | ord(\(\Delta\)) | Tamagawa | L-factor | Cluster picture |
---|---|---|---|---|---|
\(2\) | \(1\) | \(2\) | \(2\) | \(( 1 + T )( 1 + T + 2 T^{2} )\) | |
\(53\) | \(1\) | \(1\) | \(1\) | \(( 1 - T )( 1 + T + 53 T^{2} )\) | |
\(787\) | \(1\) | \(1\) | \(1\) | \(( 1 + T )( 1 + 43 T + 787 T^{2} )\) |
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);