Properties

Base field \(\Q(\sqrt{-2}) \)
Label 2.0.8.1-13122.5-d1
Conductor \((81 a)\)
Conductor norm \( 13122 \)
CM no
base-change yes: 5184.p1,162.b1
Q-curve yes
Torsion order \( 3 \)
Rank not available

Related objects

Downloads

Learn more about

Show commands for: Magma / SageMath / Pari/GP

Base field \(\Q(\sqrt{-2}) \)

Generator \(a\), with minimal polynomial \( x^{2} + 2 \); class number \(1\).

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![2, 0, 1]);
sage: x = polygen(QQ); K.<a> = NumberField(x^2 + 2)
gp (2.8): K = nfinit(a^2 + 2);

Weierstrass equation

\( y^2 + x y = x^{3} - x^{2} - 1077 x + 13877 \)
magma: E := ChangeRing(EllipticCurve([1, -1, 0, -1077, 13877]),K);
sage: E = EllipticCurve(K, [1, -1, 0, -1077, 13877])
gp (2.8): E = ellinit([1, -1, 0, -1077, 13877],K)

This is a global minimal model.

sage: E.is_global_minimal_model()

Invariants

\(\mathfrak{N} \) = \((81 a)\) = \( \left(a\right) \cdot \left(-a - 1\right)^{4} \cdot \left(a - 1\right)^{4} \)
magma: Conductor(E);
sage: E.conductor()
\(N(\mathfrak{N}) \) = \( 13122 \) = \( 2 \cdot 3^{8} \)
magma: Norm(Conductor(E));
sage: E.conductor().norm()
\(\mathfrak{D}\) = \((93312)\) = \( \left(a\right)^{14} \cdot \left(-a - 1\right)^{6} \cdot \left(a - 1\right)^{6} \)
magma: Discriminant(E);
sage: E.discriminant()
gp (2.8): E.disc
\(N(\mathfrak{D})\) = \( 8707129344 \) = \( 2^{14} \cdot 3^{12} \)
magma: Norm(Discriminant(E));
sage: E.discriminant().norm()
gp (2.8): norm(E.disc)
\(j\) = \( -\frac{189613868625}{128} \)
magma: jInvariant(E);
sage: E.j_invariant()
gp (2.8): 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()
magma: Generators(E); // includes torsion
sage: E.gens()

Regulator: not available

magma: Regulator(Generators(E));
sage: E.regulator_of_points(E.gens())

Torsion subgroup

Structure: \(\Z/3\Z\)
magma: TorsionSubgroup(E);
sage: E.torsion_subgroup().gens()
gp (2.8): elltors(E)[2]
magma: Order(TorsionSubgroup(E));
sage: E.torsion_order()
gp (2.8): elltors(E)[1]
Generator: $\left(19 : -11 : 1\right)$
magma: [f(P): P in Generators(T)] where T,f:=TorsionSubgroup(E);
sage: E.torsion_subgroup().gens()
gp (2.8): elltors(E)[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\((j)_{-}\)
\( \left(a\right) \) \(2\) \(2\) \(I_{14}\) Non-split multiplicative \(1\) \(1\) \(14\) \(14\)
\( \left(-a - 1\right) \) \(3\) \(3\) \(IV\) Additive \(-1\) \(4\) \(6\) \(0\)
\( \left(a - 1\right) \) \(3\) \(3\) \(IV\) Additive \(-1\) \(4\) \(6\) \(0\)

Galois Representations

The mod \( p \) Galois Representation has maximal image for all primes \( p \) except those listed.

prime Image of Galois Representation
\(2\) 2Cn
\(3\) 3B.1.1
\(7\) 7B

Isogenies and isogeny class

This curve has non-trivial cyclic isogenies of degree \(d\) for \(d=\) 3, 7 and 21.
Its isogeny class 13122.5-d consists of curves linked by isogenies of degrees dividing 21.

Base change

This curve is the base-change of elliptic curves 5184.p1, 162.b1, defined over \(\Q\), so it is also a \(\Q\)-curve.