Properties

Base field 6.6.434581.1
Label 6.6.434581.1-71.1-a2
Conductor \((71,2 a^{5} - 6 a^{4} - 4 a^{3} + 17 a^{2} - a - 6)\)
Conductor norm \( 71 \)
CM no
base-change no
Q-curve no
Torsion order \( 2 \)
Rank not available

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Base field 6.6.434581.1

Generator \(a\), with minimal polynomial \( x^{6} - 2 x^{5} - 4 x^{4} + 5 x^{3} + 4 x^{2} - 2 x - 1 \); class number \(1\).

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-1, -2, 4, 5, -4, -2, 1]);
sage: x = polygen(QQ); K.<a> = NumberField(x^6 - 2*x^5 - 4*x^4 + 5*x^3 + 4*x^2 - 2*x - 1)
gp (2.8): K = nfinit(a^6 - 2*a^5 - 4*a^4 + 5*a^3 + 4*a^2 - 2*a - 1);

Weierstrass equation

\( y^2 + \left(a^{5} - 2 a^{4} - 4 a^{3} + 5 a^{2} + 4 a - 1\right) x y = x^{3} + \left(-a^{5} + 6 a^{3} + 4 a^{2} - 3 a - 2\right) x^{2} + \left(-4 a^{5} + 3 a^{4} + 19 a^{3} + 5 a^{2} - 7 a - 2\right) x \)
magma: E := ChangeRing(EllipticCurve([a^5 - 2*a^4 - 4*a^3 + 5*a^2 + 4*a - 1, -a^5 + 6*a^3 + 4*a^2 - 3*a - 2, 0, -4*a^5 + 3*a^4 + 19*a^3 + 5*a^2 - 7*a - 2, 0]),K);
sage: E = EllipticCurve(K, [a^5 - 2*a^4 - 4*a^3 + 5*a^2 + 4*a - 1, -a^5 + 6*a^3 + 4*a^2 - 3*a - 2, 0, -4*a^5 + 3*a^4 + 19*a^3 + 5*a^2 - 7*a - 2, 0])
gp (2.8): E = ellinit([a^5 - 2*a^4 - 4*a^3 + 5*a^2 + 4*a - 1, -a^5 + 6*a^3 + 4*a^2 - 3*a - 2, 0, -4*a^5 + 3*a^4 + 19*a^3 + 5*a^2 - 7*a - 2, 0],K)

This is a global minimal model.

sage: E.is_global_minimal_model()

Invariants

\(\mathfrak{N} \) = \((71,2 a^{5} - 6 a^{4} - 4 a^{3} + 17 a^{2} - a - 6)\) = \( \left(2 a^{5} - 6 a^{4} - 4 a^{3} + 17 a^{2} - a - 6\right) \)
magma: Conductor(E);
sage: E.conductor()
\(N(\mathfrak{N}) \) = \( 71 \) = \( 71 \)
magma: Norm(Conductor(E));
sage: E.conductor().norm()
\(\mathfrak{D}\) = \((357911,a^{4} - 2 a^{3} - 3 a^{2} + 3 a + 261300,a^{5} - 3 a^{4} - 2 a^{3} + 8 a^{2} + 82424,a + 279766,a^{5} - 2 a^{4} - 3 a^{3} + 3 a^{2} + a + 29894,a^{5} - 2 a^{4} - 3 a^{3} + 4 a^{2} + 144496)\) = \( \left(2 a^{5} - 6 a^{4} - 4 a^{3} + 17 a^{2} - a - 6\right)^{3} \)
magma: Discriminant(E);
sage: E.discriminant()
gp (2.8): E.disc
\(N(\mathfrak{D})\) = \( 357911 \) = \( 71^{3} \)
magma: Norm(Discriminant(E));
sage: E.discriminant().norm()
gp (2.8): norm(E.disc)
\(j\) = \( -\frac{191935393}{357911} a^{5} - \frac{580390420}{357911} a^{4} + \frac{436997224}{357911} a^{3} + \frac{785354329}{357911} a^{2} - \frac{527031693}{357911} a + \frac{334971338}{357911} \)
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: \(\Z/2\Z\)
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: $\left(0 : 0 : 1\right)$
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\((j)_{-}\)
\( \left(2 a^{5} - 6 a^{4} - 4 a^{3} + 17 a^{2} - a - 6\right) \) \(71\) \(1\) \(I_{3}\) Non-split multiplicative \(1\) \(1\) \(3\) \(3\)

Galois Representations

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

prime Image of Galois Representation
\(2\) 2B
\(3\) 3B

Isogenies and isogeny class

This curve has non-trivial cyclic isogenies of degree \(d\) for \(d=\) 2, 3 and 6.
Its isogeny class 71.1-a consists of curves linked by isogenies of degrees dividing 6.

Base change

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