Properties

Base field 4.4.2777.1
Label 4.4.2777.1-22.1-c2
Conductor \((22,2 a^{3} - 3 a^{2} - 5 a + 4)\)
Conductor norm \( 22 \)
CM no
base-change no
Q-curve no
Torsion order \( 2 \)
Rank not available

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Base field 4.4.2777.1

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

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

Weierstrass equation

\( y^2 + \left(a^{3} - 4 a - 1\right) x y + \left(a^{3} - a^{2} - 3 a + 1\right) y = x^{3} + \left(-a^{2} + 2 a + 2\right) x^{2} + \left(5 a^{3} - 46 a^{2} + 23 a + 25\right) x - 76 a^{3} + 260 a^{2} + 9 a - 124 \)
magma: E := ChangeRing(EllipticCurve([a^3 - 4*a - 1, -a^2 + 2*a + 2, a^3 - a^2 - 3*a + 1, 5*a^3 - 46*a^2 + 23*a + 25, -76*a^3 + 260*a^2 + 9*a - 124]),K);
sage: E = EllipticCurve(K, [a^3 - 4*a - 1, -a^2 + 2*a + 2, a^3 - a^2 - 3*a + 1, 5*a^3 - 46*a^2 + 23*a + 25, -76*a^3 + 260*a^2 + 9*a - 124])
gp (2.8): E = ellinit([a^3 - 4*a - 1, -a^2 + 2*a + 2, a^3 - a^2 - 3*a + 1, 5*a^3 - 46*a^2 + 23*a + 25, -76*a^3 + 260*a^2 + 9*a - 124],K)

This is a global minimal model.

sage: E.is_global_minimal_model()

Invariants

\(\mathfrak{N} \) = \((22,2 a^{3} - 3 a^{2} - 5 a + 4)\) = \( \left(-a\right) \cdot \left(-a^{3} + 2 a^{2} + 2 a - 1\right) \)
magma: Conductor(E);
sage: E.conductor()
\(N(\mathfrak{N}) \) = \( 22 \) = \( 2 \cdot 11 \)
magma: Norm(Conductor(E));
sage: E.conductor().norm()
\(\mathfrak{D}\) = \((44,a + 6,a^{3} - a^{2} - 3 a + 14,a^{2} - a + 2)\) = \( \left(-a\right)^{2} \cdot \left(-a^{3} + 2 a^{2} + 2 a - 1\right) \)
magma: Discriminant(E);
sage: E.discriminant()
gp (2.8): E.disc
\(N(\mathfrak{D})\) = \( 44 \) = \( 2^{2} \cdot 11 \)
magma: Norm(Discriminant(E));
sage: E.discriminant().norm()
gp (2.8): norm(E.disc)
\(j\) = \( \frac{85048962626261637}{44} a^{3} + \frac{115966996128885001}{44} a^{2} - \frac{33248386401040127}{22} a - \frac{72060916678769347}{44} \)
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: $\left(-\frac{3}{2} a^{3} + \frac{19}{4} a^{2} + \frac{7}{4} a - \frac{23}{4} : \frac{11}{8} a^{3} - \frac{7}{2} a^{2} - \frac{27}{8} a + \frac{13}{8} : 1\right)$
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\((j)_{-}\)
\( \left(-a\right) \) \(2\) \(2\) \(I_{2}\) Non-split multiplicative \(1\) \(1\) \(2\) \(2\)
\( \left(-a^{3} + 2 a^{2} + 2 a - 1\right) \) \(11\) \(1\) \(I_{1}\) Split multiplicative \(-1\) \(1\) \(1\) \(1\)

Galois Representations

The mod \( p \) Galois Representation has maximal image for all primes \( p \) 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, 4 and 8.
Its isogeny class 22.1-c consists of curves linked by isogenies of degrees dividing 8.

Base change

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