# Properties

 Label 1047.a.3141.1 Conductor $1047$ Discriminant $3141$ Mordell-Weil group $$\Z/{10}\Z$$ Sato-Tate group $\mathrm{USp}(4)$ $$\End(J_{\overline{\Q}}) \otimes \R$$ $$\R$$ $$\End(J_{\overline{\Q}}) \otimes \Q$$ $$\Q$$ $$\End(J) \otimes \Q$$ $$\Q$$ $$\overline{\Q}$$-simple yes $$\mathrm{GL}_2$$-type no

# Related objects

Show commands: SageMath / Magma

## Simplified equation

 $y^2 + (x^3 + x)y = x$ (homogenize, simplify) $y^2 + (x^3 + xz^2)y = xz^5$ (dehomogenize, simplify) $y^2 = x^6 + 2x^4 + x^2 + 4x$ (minimize, homogenize)

sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([0, 1]), R([0, 1, 0, 1]));

magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![0, 1], R![0, 1, 0, 1]);

sage: X = HyperellipticCurve(R([0, 4, 1, 0, 2, 0, 1]))

magma: X,pi:= SimplifiedModel(C);

## Invariants

 Conductor: $$N$$ $$=$$ $$1047$$ $$=$$ $$3 \cdot 349$$ magma: Conductor(LSeries(C)); Factorization($1); Discriminant: $$\Delta$$ $$=$$ $$3141$$ $$=$$ $$3^{2} \cdot 349$$ magma: Discriminant(C); Factorization(Integers()!$1);

### G2 invariants

 $$I_2$$ $$=$$ $$8$$ $$=$$ $$2^{3}$$ $$I_4$$ $$=$$ $$604$$ $$=$$ $$2^{2} \cdot 151$$ $$I_6$$ $$=$$ $$1017$$ $$=$$ $$3^{2} \cdot 113$$ $$I_{10}$$ $$=$$ $$-12564$$ $$=$$ $$- 2^{2} \cdot 3^{2} \cdot 349$$ $$J_2$$ $$=$$ $$4$$ $$=$$ $$2^{2}$$ $$J_4$$ $$=$$ $$-100$$ $$=$$ $$- 2^{2} \cdot 5^{2}$$ $$J_6$$ $$=$$ $$-1$$ $$=$$ $$-1$$ $$J_8$$ $$=$$ $$-2501$$ $$=$$ $$- 41 \cdot 61$$ $$J_{10}$$ $$=$$ $$-3141$$ $$=$$ $$- 3^{2} \cdot 349$$ $$g_1$$ $$=$$ $$-1024/3141$$ $$g_2$$ $$=$$ $$6400/3141$$ $$g_3$$ $$=$$ $$16/3141$$

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

 All points: $$(1 : 0 : 0),\, (1 : -1 : 0),\, (0 : 0 : 1),\, (-1 : 1 : 1)$$ All points: $$(1 : 0 : 0),\, (1 : -1 : 0),\, (0 : 0 : 1),\, (-1 : 1 : 1)$$ All points: $$(1 : -1 : 0),\, (1 : 1 : 0),\, (0 : 0 : 1),\, (-1 : 0 : 1)$$

magma: [C![-1,1,1],C![0,0,1],C![1,-1,0],C![1,0,0]]; // minimal model

magma: [C![-1,0,1],C![0,0,1],C![1,-1,0],C![1,1,0]]; // simplified model

Number of rational Weierstrass points: $$2$$

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: $$\Z/{10}\Z$$

magma: MordellWeilGroupGenus2(Jacobian(C));

Generator $D_0$ Height Order
$$(-1 : 1 : 1) - (1 : -1 : 0)$$ $$z (x + z)$$ $$=$$ $$0,$$ $$y$$ $$=$$ $$z^3$$ $$0$$ $$10$$
Generator $D_0$ Height Order
$$(-1 : 1 : 1) - (1 : -1 : 0)$$ $$z (x + z)$$ $$=$$ $$0,$$ $$y$$ $$=$$ $$z^3$$ $$0$$ $$10$$
Generator $D_0$ Height Order
$$(-1 : 0 : 1) - (1 : -1 : 0)$$ $$z (x + z)$$ $$=$$ $$0,$$ $$y$$ $$=$$ $$x^3 + xz^2 + 2z^3$$ $$0$$ $$10$$

## BSD invariants

 Hasse-Weil conjecture: unverified Analytic rank: $$0$$ Mordell-Weil rank: $$0$$ 2-Selmer rank: $$1$$ Regulator: $$1$$ Real period: $$17.82167$$ Tamagawa product: $$2$$ Torsion order: $$10$$ Leading coefficient: $$0.356433$$ Analytic order of Ш: $$1$$   (rounded) Order of Ш: square

## Local invariants

Prime ord($$N$$) ord($$\Delta$$) Tamagawa L-factor Cluster picture
$$3$$ $$1$$ $$2$$ $$2$$ $$( 1 - T )( 1 + T + 3 T^{2} )$$
$$349$$ $$1$$ $$1$$ $$1$$ $$( 1 - T )( 1 + 10 T + 349 T^{2} )$$

## Sato-Tate group

 $$\mathrm{ST}$$ $$\simeq$$ $\mathrm{USp}(4)$ $$\mathrm{ST}^0$$ $$\simeq$$ $$\mathrm{USp}(4)$$

## Decomposition of the Jacobian

Simple over $$\overline{\Q}$$

## 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 $$\Q$$.