# Properties

 Label 2.0.7.1-2916.2-a3 Base field $$\Q(\sqrt{-7})$$ Conductor $$(54)$$ Conductor norm $$2916$$ CM no Base change yes: 54.a3,2646.a3 Q-curve yes Torsion order $$3$$ Rank $$0$$

# Related objects

Show commands for: Magma / Pari/GP / SageMath

## Base field$$\Q(\sqrt{-7})$$

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

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

gp: K = nfinit(a^2 - a + 2);

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![2, -1, 1]);

## Weierstrass equation

$$y^2+xy=x^{3}-x^{2}+12x+8$$
sage: E = EllipticCurve(K, [1, -1, 0, 12, 8])

gp: E = ellinit([1, -1, 0, 12, 8],K)

magma: E := ChangeRing(EllipticCurve([1, -1, 0, 12, 8]),K);

This is a global minimal model.

sage: E.is_global_minimal_model()

## Invariants

 Conductor: $$(54)$$ = $$\left(a\right) \cdot \left(-a + 1\right) \cdot \left(3\right)^{3}$$ sage: E.conductor()  magma: Conductor(E); Conductor norm: $$2916$$ = $$2^{2} \cdot 9^{3}$$ sage: E.conductor().norm()  magma: Norm(Conductor(E)); Discriminant: $$(157464)$$ = $$\left(a\right)^{3} \cdot \left(-a + 1\right)^{3} \cdot \left(3\right)^{9}$$ sage: E.discriminant()  gp: E.disc  magma: Discriminant(E); Discriminant norm: $$24794911296$$ = $$2^{6} \cdot 9^{9}$$ sage: E.discriminant().norm()  gp: norm(E.disc)  magma: Norm(Discriminant(E)); j-invariant: $$\frac{9261}{8}$$ sage: E.j_invariant()  gp: E.j  magma: jInvariant(E); Endomorphism ring: $$\Z$$ Geometric endomorphism ring: $$\Z$$ (no potential complex multiplication) sage: E.has_cm(), E.cm_discriminant()  magma: HasComplexMultiplication(E); Sato-Tate group: $\mathrm{SU}(2)$

## Mordell-Weil group

 Rank: $$0$$ Torsion structure: $$\Z/3\Z$$ sage: T = E.torsion_subgroup(); T.invariants()  gp: T = elltors(E); T[2]  magma: T,piT := TorsionSubgroup(E); Invariants(T); Torsion generator: $\left(1 : -5 : 1\right)$ 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: $$1.87837840894579$$ Tamagawa product: $$3$$  =  $$1\cdot1\cdot3$$ Torsion order: $$3$$ Leading coefficient: $$0.473306870299405$$ 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$$(j)_{-}$$
$$\left(a\right)$$ $$2$$ $$1$$ $$I_{3}$$ Non-split multiplicative $$1$$ $$1$$ $$3$$ $$3$$
$$\left(-a + 1\right)$$ $$2$$ $$1$$ $$I_{3}$$ Non-split multiplicative $$1$$ $$1$$ $$3$$ $$3$$
$$\left(3\right)$$ $$9$$ $$3$$ $$IV^*$$ Additive $$-1$$ $$3$$ $$9$$ $$0$$

## Galois Representations

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

prime Image of Galois Representation
$$3$$ 3Cs.1.1

## Isogenies and isogeny class

This curve has non-trivial cyclic isogenies of degree $$d$$ for $$d=$$ 3.
Its isogeny class 2916.2-a consists of curves linked by isogenies of degrees dividing 9.

## Base change

This curve is the base change of elliptic curves 54.a3, 2646.a3, defined over $$\Q$$, so it is also a $$\Q$$-curve.