Minimal equation
magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![1, 1, -1, -2, 0, 1], R![0, 1, 0, 1]);
sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([1, 1, -1, -2, 0, 1]), R([0, 1, 0, 1]))
$y^2 + (x^3 + x)y = x^5 - 2x^3 - x^2 + x + 1$
Invariants
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magma: Conductor(LSeries(C)); Factorization($1);
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| \( N \) | = | \( 11944 \) | = | \( 2^{3} \cdot 1493 \) | |
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magma: Discriminant(C); Factorization(Integers()!$1);
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| \( \Delta \) | = | \(-95552\) | = | \( -1 \cdot 2^{6} \cdot 1493 \) | |
Igusa-Clebsch invariants
magma: IgusaClebschInvariants(C); [Factorization(Integers()!a): a in $1];
sage: C.igusa_clebsch_invariants(); [factor(a) for a in _]
Igusa invariants
magma: IgusaInvariants(C); [Factorization(Integers()!a): a in $1];
G2 invariants
magma: G2Invariants(C);
| \( I_2 \) | = | \(160\) | = | \( 2^{5} \cdot 5 \) |
| \( I_4 \) | = | \(88576\) | = | \( 2^{9} \cdot 173 \) |
| \( I_6 \) | = | \(963328\) | = | \( 2^{8} \cdot 53 \cdot 71 \) |
| \( I_{10} \) | = | \(-391380992\) | = | \( -1 \cdot 2^{18} \cdot 1493 \) |
| \( J_2 \) | = | \(20\) | = | \( 2^{2} \cdot 5 \) |
| \( J_4 \) | = | \(-906\) | = | \( -1 \cdot 2 \cdot 3 \cdot 151 \) |
| \( J_6 \) | = | \(3472\) | = | \( 2^{4} \cdot 7 \cdot 31 \) |
| \( J_8 \) | = | \(-187849\) | = | \( -1 \cdot 37 \cdot 5077 \) |
| \( J_{10} \) | = | \(-95552\) | = | \( -1 \cdot 2^{6} \cdot 1493 \) |
| \( g_1 \) | = | \(-50000/1493\) | ||
| \( g_2 \) | = | \(113250/1493\) | ||
| \( g_3 \) | = | \(-21700/1493\) |
Automorphism group
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magma: AutomorphismGroup(C); IdentifyGroup($1);
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| \(\mathrm{Aut}(X)\) | \(\simeq\) | \(C_2 \) | (GAP id : [2,1]) | ||
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magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1);
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| \(\mathrm{Aut}(X_{\overline{\Q}})\) | \(\simeq\) | \(C_2 \) | (GAP id : [2,1]) | ||
Rational points
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);
This curve is locally solvable everywhere.
magma: [C![-3,10,1],C![-3,20,1],C![-2,3,1],C![-2,7,1],C![-1,0,1],C![-1,2,1],C![0,-1,1],C![0,1,1],C![1,-11,2],C![1,-2,1],C![1,-1,0],C![1,0,0],C![1,0,1],C![1,6,2]];
Known rational points: (-3 : 10 : 1), (-3 : 20 : 1), (-2 : 3 : 1), (-2 : 7 : 1), (-1 : 0 : 1), (-1 : 2 : 1), (0 : -1 : 1), (0 : 1 : 1), (1 : -11 : 2), (1 : -2 : 1), (1 : -1 : 0), (1 : 0 : 0), (1 : 0 : 1), (1 : 6 : 2)
magma: #Roots(HyperellipticPolynomials(SimplifiedModel(C)));
Number of rational Weierstrass points: \(0\)
Invariants of the Jacobian:
Analytic rank*: \(2\)
magma: TwoSelmerGroup(Jacobian(C)); NumberOfGenerators($1);
2-Selmer rank: \(2\)
magma: HasSquareSha(Jacobian(C));
Order of Ш*: square
Regulator: 0.00465674830447
Real period: 19.235030079544825801694536562
Tamagawa numbers: 6 (p = 2), 1 (p = 1493)
magma: TorsionSubgroup(Jacobian(SimplifiedModel(C))); AbelianInvariants($1);
Torsion: \(\mathrm{trivial}\)
Sato-Tate group
| \(\mathrm{ST}\) | \(\simeq\) | $\mathrm{USp}(4)$ |
| \(\mathrm{ST}^0\) | \(\simeq\) | \(\mathrm{USp}(4)\) |
Decomposition
Simple over \(\overline{\Q}\)
Endomorphisms
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 \(\Q\).