Properties

Base field 4.4.19821.1
Label 4.4.19821.1-39.1-a1
Conductor \((39,a^{3} - a^{2} - 7 a + 6)\)
Conductor norm \( 39 \)
CM no
base-change no
Q-curve no
Torsion order \( 1 \)
Rank not available

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Base field 4.4.19821.1

Generator \(a\), with minimal polynomial \( x^{4} - x^{3} - 8 x^{2} + 6 x + 3 \); class number \(1\).

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![3, 6, -8, -1, 1]);
sage: x = polygen(QQ); K.<a> = NumberField(x^4 - x^3 - 8*x^2 + 6*x + 3)
gp (2.8): K = nfinit(a^4 - a^3 - 8*a^2 + 6*a + 3);

Weierstrass equation

\( y^2 + \left(\frac{1}{3} a^{3} + \frac{1}{3} a^{2} - 2 a - 1\right) y = x^{3} - x^{2} + \left(\frac{4}{3} a^{3} - \frac{14}{3} a^{2} + 2 a + 2\right) x - \frac{4}{3} a^{3} + \frac{14}{3} a^{2} - 3 a - 2 \)
magma: E := ChangeRing(EllipticCurve([0, -1, 1/3*a^3 + 1/3*a^2 - 2*a - 1, 4/3*a^3 - 14/3*a^2 + 2*a + 2, -4/3*a^3 + 14/3*a^2 - 3*a - 2]),K);
sage: E = EllipticCurve(K, [0, -1, 1/3*a^3 + 1/3*a^2 - 2*a - 1, 4/3*a^3 - 14/3*a^2 + 2*a + 2, -4/3*a^3 + 14/3*a^2 - 3*a - 2])
gp (2.8): E = ellinit([0, -1, 1/3*a^3 + 1/3*a^2 - 2*a - 1, 4/3*a^3 - 14/3*a^2 + 2*a + 2, -4/3*a^3 + 14/3*a^2 - 3*a - 2],K)

This is a global minimal model.

sage: E.is_global_minimal_model()

Invariants

\(\mathfrak{N} \) = \((39,a^{3} - a^{2} - 7 a + 6)\) = \( \left(-\frac{1}{3} a^{3} - \frac{1}{3} a^{2} + 3 a + 2\right) \cdot \left(-\frac{2}{3} a^{3} + \frac{1}{3} a^{2} + 5 a\right) \)
magma: Conductor(E);
sage: E.conductor()
\(N(\mathfrak{N}) \) = \( 39 \) = \( 3 \cdot 13 \)
magma: Norm(Conductor(E));
sage: E.conductor().norm()
\(\mathfrak{D}\) = \((3159,81 a + 729,\frac{1}{3} a^{3} + \frac{1}{3} a^{2} + 37 a + 211,-\frac{1}{3} a^{3} + \frac{2}{3} a^{2} + 35 a + 2501)\) = \( \left(-\frac{1}{3} a^{3} - \frac{1}{3} a^{2} + 3 a + 2\right)^{9} \cdot \left(-\frac{2}{3} a^{3} + \frac{1}{3} a^{2} + 5 a\right) \)
magma: Discriminant(E);
sage: E.discriminant()
gp (2.8): E.disc
\(N(\mathfrak{D})\) = \( 255879 \) = \( 3^{9} \cdot 13 \)
magma: Norm(Discriminant(E));
sage: E.discriminant().norm()
gp (2.8): norm(E.disc)
\(j\) = \( \frac{111853568}{3159} a^{3} + \frac{12132352}{3159} a^{2} - \frac{882774016}{3159} a - \frac{100966400}{1053} \)
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: Trivial
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]

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\((j)_{-}\)
\( \left(-\frac{1}{3} a^{3} - \frac{1}{3} a^{2} + 3 a + 2\right) \) \(3\) \(1\) \(I_{9}\) Non-split multiplicative \(1\) \(1\) \(9\) \(9\)
\( \left(-\frac{2}{3} a^{3} + \frac{1}{3} a^{2} + 5 a\right) \) \(13\) \(1\) \(I_{1}\) Non-split multiplicative \(1\) \(1\) \(1\) \(1\)

Galois Representations

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

Isogenies and isogeny class

This curve has no rational isogenies. Its isogeny class 39.1-a consists of this curve only.

Base change

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