# Properties

 Base field $$\Q(\sqrt{6})$$ Label 2.2.24.1-784.1-d3 Conductor $$(28)$$ Conductor norm $$784$$ CM no base-change yes: 112.b3,4032.bb3 Q-curve yes Torsion order $$4$$ Rank not available

# Related objects

Show commands for: Magma / SageMath / Pari/GP

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

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

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

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

gp: K = nfinit(a^2 - 6);

## Weierstrass equation

$$y^2 + a x y = x^{3} + \left(95 a - 232\right) x + 790 a - 1935$$
magma: E := ChangeRing(EllipticCurve([a, 0, 0, 95*a - 232, 790*a - 1935]),K);

sage: E = EllipticCurve(K, [a, 0, 0, 95*a - 232, 790*a - 1935])

gp: E = ellinit([a, 0, 0, 95*a - 232, 790*a - 1935],K)

This is a global minimal model.

sage: E.is_global_minimal_model()

## Invariants

 $$\mathfrak{N}$$ = $$(28)$$ = $$\left(-a + 2\right)^{4} \cdot \left(7\right)$$ magma: Conductor(E);  sage: E.conductor() $$N(\mathfrak{N})$$ = $$784$$ = $$2^{4} \cdot 49$$ magma: Norm(Conductor(E));  sage: E.conductor().norm() $$\mathfrak{D}$$ = $$(784)$$ = $$\left(-a + 2\right)^{8} \cdot \left(7\right)^{2}$$ magma: Discriminant(E);  sage: E.discriminant()  gp: E.disc $$N(\mathfrak{D})$$ = $$614656$$ = $$2^{8} \cdot 49^{2}$$ magma: Norm(Discriminant(E));  sage: E.discriminant().norm()  gp: norm(E.disc) $$j$$ = $$\frac{740772}{49}$$ magma: jInvariant(E);  sage: E.j_invariant()  gp: E.j $$\text{End} (E)$$ = $$\Z$$ (no Complex Multiplication ) magma: HasComplexMultiplication(E);  sage: E.has_cm(), E.cm_discriminant() $$\text{ST} (E)$$ = $\mathrm{SU}(2)$

## Mordell-Weil group

Rank not available.

magma: Rank(E);

sage: E.rank()

Regulator: not available

magma: gens := [P:P in Generators(E)|Order(P) eq 0]; gens;

sage: gens = E.gens(); gens

magma: Regulator(gens);

sage: E.regulator_of_points(gens)

## Torsion subgroup

Structure: $$\Z/2\Z\times\Z/2\Z$$ magma: T,piT := TorsionSubgroup(E); Invariants(T);  sage: T = E.torsion_subgroup(); T.invariants()  gp: T = elltors(E); T[2] $\left(3 a - 8 : 4 a - 9 : 1\right)$,$\left(2 a - \frac{11}{2} : \frac{11}{4} a - 6 : 1\right)$ magma: [piT(P) : P in Generators(T)];  sage: T.gens()  gp: T[3]

## Local data at primes of bad reduction

magma: LocalInformation(E);

sage: E.local_data()

prime Norm Tamagawa number Kodaira symbol Reduction type Root number ord($$\mathfrak{N}$$) ord($$\mathfrak{D}$$) ord$$(j)_{-}$$
$$\left(-a + 2\right)$$ $$2$$ $$2$$ $$I_{0}^*$$ Additive $$-1$$ $$4$$ $$8$$ $$0$$
$$\left(7\right)$$ $$49$$ $$2$$ $$I_{2}$$ Split multiplicative $$-1$$ $$1$$ $$2$$ $$2$$

## 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

## Isogenies and isogeny class

This curve has non-trivial cyclic isogenies of degree $$d$$ for $$d=$$ 2.
Its isogeny class 784.1-d consists of curves linked by isogenies of degrees dividing 4.

## Base change

This curve is the base-change of elliptic curves 112.b3, 4032.bb3, defined over $$\Q$$, so it is also a $$\Q$$-curve.