# Properties

 Label 2.2.12.1-1024.1-m2 Base field $$\Q(\sqrt{3})$$ Conductor $$(32)$$ Conductor norm $$1024$$ CM yes ($$-4$$) Base change no Q-curve yes Torsion order $$4$$ Rank $$0$$

# Related objects

Show commands for: Magma / Pari/GP / SageMath

## Base field$$\Q(\sqrt{3})$$

Generator $$a$$, with minimal polynomial $$x^{2} - 3$$; class number $$1$$.

sage: x = polygen(QQ); K.<a> = NumberField(x^2 - 3)

gp: K = nfinit(a^2 - 3);

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-3, 0, 1]);

## Weierstrass equation

$$y^2=x^{3}+\left(2a-4\right)x$$
sage: E = EllipticCurve(K, [0, 0, 0, 2*a - 4, 0])

gp: E = ellinit([0, 0, 0, 2*a - 4, 0],K)

magma: E := ChangeRing(EllipticCurve([0, 0, 0, 2*a - 4, 0]),K);

This is a global minimal model.

sage: E.is_global_minimal_model()

## Invariants

 Conductor: $$(32)$$ = $$\left(a + 1\right)^{10}$$ sage: E.conductor()  magma: Conductor(E); Conductor norm: $$1024$$ = $$2^{10}$$ sage: E.conductor().norm()  magma: Norm(Conductor(E)); Discriminant: $$(512)$$ = $$\left(a + 1\right)^{18}$$ sage: E.discriminant()  gp: E.disc  magma: Discriminant(E); Discriminant norm: $$262144$$ = $$2^{18}$$ sage: E.discriminant().norm()  gp: norm(E.disc)  magma: Norm(Discriminant(E)); j-invariant: $$1728$$ sage: E.j_invariant()  gp: E.j  magma: jInvariant(E); Endomorphism ring: $$\Z$$ Geometric endomorphism ring: $$\Z[\sqrt{-1}]$$ (potential complex multiplication) sage: E.has_cm(), E.cm_discriminant()  magma: HasComplexMultiplication(E); Sato-Tate group: $N(\mathrm{U}(1))$

## Mordell-Weil group

 Rank: $$0$$ Torsion structure: $$\Z/2\Z\times\Z/2\Z$$ sage: T = E.torsion_subgroup(); T.invariants()  gp: T = elltors(E); T[2]  magma: T,piT := TorsionSubgroup(E); Invariants(T); Torsion generators: $\left(-a + 1 : 0 : 1\right)$ $\left(0 : 0 : 1\right)$ sage: T.gens()  gp: T[3]  magma: [piT(P) : P in Generators(T)];

## BSD invariants

 Analytic rank: $$0$$ sage: E.rank()  magma: Rank(E); Mordell-Weil rank: $$0$$ Regulator: $$1$$ Period: $$19.4459620553591$$ Tamagawa product: $$4$$ Torsion order: $$4$$ Leading coefficient: $$1.40339142841411$$ Analytic order of Ш: $$1$$ (rounded)

## Local data at primes of bad reduction

sage: E.local_data()

magma: LocalInformation(E);

prime Norm Tamagawa number Kodaira symbol Reduction type Root number ord($$\mathfrak{N}$$) ord($$\mathfrak{D}$$) ord$$(j)_{-}$$
$$\left(a + 1\right)$$ $$2$$ $$4$$ $$I_{4}^*$$ Additive $$1$$ $$10$$ $$18$$ $$0$$

## Galois Representations

The mod $$p$$ Galois Representation has maximal image for all primes $$p < 1000$$ except those listed.

prime Image of Galois Representation
$$2$$ 2Cs

For all other primes $$p$$, the image is the normalizer of a split Cartan subgroup if $$\left(\frac{ -1 }{p}\right)=+1$$ or the normalizer of a nonsplit Cartan subgroup if $$\left(\frac{ -1 }{p}\right)=-1$$.

## Isogenies and isogeny class

This curve has non-trivial cyclic isogenies of degree $$d$$ for $$d=$$ 2.
Its isogeny class 1024.1-m consists of curves linked by isogenies of degrees dividing 4.

## Base change

This curve is not the base change of an elliptic curve defined over $$\Q$$. It is a $$\Q$$-curve.