# Properties

 Label 336.a.172032.1 Conductor 336 Discriminant -172032 Mordell-Weil group $$\Z/{2}\Z$$ Sato-Tate group $G_{3,3}$ $$\End(J_{\overline{\Q}}) \otimes \R$$ $$\R \times \R$$ $$\End(J_{\overline{\Q}}) \otimes \Q$$ $$\Q \times \Q$$ $$\overline{\Q}$$-simple no $$\mathrm{GL}_2$$-type yes

# Related objects

Show commands for: Magma / SageMath

## Simplified equation

magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![-56, 0, -75, 0, 15, 0, -1], R![0, 1, 0, 1]);

sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([-56, 0, -75, 0, 15, 0, -1]), R([0, 1, 0, 1]))

magma: R<x> := PolynomialRing(Rationals()); C := HyperellipticCurve(R![-56, 0, -75, 0, 15, 0, -1], R![0, 1, 0, 1]);

sage: R.<x> = PolynomialRing(QQ); C = HyperellipticCurve(R([-224, 0, -299, 0, 62, 0, -3]))

 $y^2 + (x^3 + x)y = -x^6 + 15x^4 - 75x^2 - 56$ (homogenize, simplify) $y^2 + (x^3 + xz^2)y = -x^6 + 15x^4z^2 - 75x^2z^4 - 56z^6$ (dehomogenize, simplify) $y^2 = -3x^6 + 62x^4 - 299x^2 - 224$ (minimize, homogenize)

## Invariants

 $$N$$ = $$336$$ = $$2^{4} \cdot 3 \cdot 7$$ magma: Conductor(LSeries(C: ExcFactors:=[*<2,Valuation(336,2),R![1, 1]>*])); Factorization($1); $$\Delta$$ = $$-172032$$ = $$- 2^{13} \cdot 3 \cdot 7$$ magma: Discriminant(C); Factorization(Integers()!$1);

### G2 invariants

magma: G2Invariants(C);

 $$I_2$$ = $$135328$$ = $$2^{5} \cdot 4229$$ $$I_4$$ = $$9671540800$$ = $$2^{6} \cdot 5^{2} \cdot 6044713$$ $$I_6$$ = $$119230681068032$$ = $$2^{9} \cdot 397 \cdot 586580413$$ $$I_{10}$$ = $$-704643072$$ = $$- 2^{25} \cdot 3 \cdot 7$$ $$J_2$$ = $$16916$$ = $$2^{2} \cdot 4229$$ $$J_4$$ = $$-88822256$$ = $$- 2^{4} \cdot 103 \cdot 53897$$ $$J_6$$ = $$277597802496$$ = $$2^{12} \cdot 3 \cdot 7 \cdot 3227281$$ $$J_8$$ = $$-798387183476800$$ = $$- 2^{6} \cdot 5^{2} \cdot 107 \cdot 991 \cdot 4705829$$ $$J_{10}$$ = $$-172032$$ = $$- 2^{13} \cdot 3 \cdot 7$$ $$g_1$$ = $$-1352659309173012149/168$$ $$g_2$$ = $$419870026410625699/168$$ $$g_3$$ = $$-461744933079368$$

## Automorphism group

 magma: AutomorphismGroup(C); IdentifyGroup($1); $$\mathrm{Aut}(X)$$ $$\simeq$$$C_2^2$magma: AutomorphismGroup(ChangeRing(C,AlgebraicClosure(Rationals()))); IdentifyGroup($1); $$\mathrm{Aut}(X_{\overline{\Q}})$$ $$\simeq$$ $C_2^2$

## Rational points

magma: [];

This curve has no rational points.

magma: #Roots(HyperellipticPolynomials(SimplifiedModel(C)));

Number of rational Weierstrass points: $$0$$

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 except over $\Q_{2}$.

## Mordell-Weil group of the Jacobian:

magma: MordellWeilGroupGenus2(Jacobian(C));

Group structure: $$\Z/{2}\Z$$

Generator Height Order
$$3x^2 - 32z^2$$ $$=$$ $$0,$$ $$6y$$ $$=$$ $$-35xz^2$$ $$0$$ $$2$$

## BSD invariants

 Analytic rank: $$0$$ Mordell-Weil rank: $$0$$ 2-Selmer rank: $$2$$ Regulator: $$1$$ Real period: $$0.356066$$ Tamagawa product: $$1$$ Torsion order: $$2$$ Leading coefficient: $$0.178033$$ Analytic order of Ш: $$2$$   (rounded) Order of Ш: twice a square

## Local invariants

Prime ord($$N$$) ord($$\Delta$$) Tamagawa L-factor
$$2$$ $$13$$ $$4$$ $$1$$ $$1 + T$$
$$3$$ $$1$$ $$1$$ $$1$$ $$( 1 + T )( 1 + 2 T + 3 T^{2} )$$
$$7$$ $$1$$ $$1$$ $$1$$ $$( 1 - T )( 1 + 7 T^{2} )$$

## Sato-Tate group

 $$\mathrm{ST}$$ $$\simeq$$ $G_{3,3}$ $$\mathrm{ST}^0$$ $$\simeq$$ $$\mathrm{SU}(2)\times\mathrm{SU}(2)$$

## Decomposition of the Jacobian

Splits over $$\Q$$

Decomposes up to isogeny as the product of the non-isogenous elliptic curves:
Elliptic curve 14.a1
Elliptic curve 24.a1

## Endomorphisms of the Jacobian

Of $$\GL_2$$-type over $$\Q$$

Endomorphism ring over $$\Q$$:

 $$\End (J_{})$$ $$\simeq$$ an order of index $$2$$ in $$\Z \times \Z$$ $$\End (J_{}) \otimes \Q$$ $$\simeq$$ $$\Q$$ $$\times$$ $$\Q$$ $$\End (J_{}) \otimes \R$$ $$\simeq$$ $$\R \times \R$$

All $$\overline{\Q}$$-endomorphisms of the Jacobian are defined over $$\Q$$.