# Properties

 Label 2.2.24.1-25.2-b1 Base field $$\Q(\sqrt{6})$$ Conductor $$(-2 a + 7)$$ Conductor norm $$25$$ CM no Base change no Q-curve no Torsion order $$2$$ Rank $$0$$

# Related objects

Show commands for: Magma / Pari/GP / SageMath

## Base field$$\Q(\sqrt{6})$$

Generator $$a$$, with minimal polynomial $$x^{2} - 6$$; class number $$1$$.

sage: x = polygen(QQ); K.<a> = NumberField(x^2 - 6)

gp: K = nfinit(a^2 - 6);

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-6, 0, 1]);

## Weierstrass equation

$$y^2+axy+y=x^{3}+\left(-a-1\right)x^{2}+\left(-2a+2\right)x+5$$
sage: E = EllipticCurve(K, [a, -a - 1, 1, -2*a + 2, 5])

gp: E = ellinit([a, -a - 1, 1, -2*a + 2, 5],K)

magma: E := ChangeRing(EllipticCurve([a, -a - 1, 1, -2*a + 2, 5]),K);

This is a global minimal model.

sage: E.is_global_minimal_model()

## Invariants

 Conductor: $$(-2 a + 7)$$ = $$\left(-a + 1\right)^{2}$$ sage: E.conductor()  magma: Conductor(E); Conductor norm: $$25$$ = $$5^{2}$$ sage: E.conductor().norm()  magma: Norm(Conductor(E)); Discriminant: $$(322 a + 3223)$$ = $$\left(-a + 1\right)^{10}$$ sage: E.discriminant()  gp: E.disc  magma: Discriminant(E); Discriminant norm: $$9765625$$ = $$5^{10}$$ sage: E.discriminant().norm()  gp: norm(E.disc)  magma: Norm(Discriminant(E)); j-invariant: $$-\frac{213248}{625} a + \frac{84032}{625}$$ 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: $$\Z/2\Z$$ sage: T = E.torsion_subgroup(); T.invariants()  gp: T = elltors(E); T[2]  magma: T,piT := TorsionSubgroup(E); Invariants(T); Torsion generator: $\left(-\frac{3}{2} : \frac{3}{4} a - \frac{1}{2} : 1\right)$ 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: $$11.9924292758808$$ Tamagawa product: $$4$$ Torsion order: $$2$$ Leading coefficient: $$2.44794437519357$$ 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$$(j)_{-}$$
$$\left(-a + 1\right)$$ $$5$$ $$4$$ $$I_{4}^*$$ Additive $$1$$ $$2$$ $$10$$ $$4$$

## Galois Representations

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

prime Image of Galois Representation
$$2$$ 2B

## Isogenies and isogeny class

This curve has non-trivial cyclic isogenies of degree $$d$$ for $$d=$$ 2.
Its isogeny class 25.2-b consists of curves linked by isogenies of degree 2.

## Base change

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