Properties

Base field \(\Q(\zeta_{11})^+\)
Label 5.5.14641.1-23.1-a4
Conductor \((23,-a^{4} + 3 a^{2} + 1)\)
Conductor norm \( 23 \)
CM no
base-change no
Q-curve no
Torsion order \( 2 \)
Rank not available

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Base field \(\Q(\zeta_{11})^+\)

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

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

Weierstrass equation

\( y^2 + \left(a^{4} - 3 a^{2} + a + 1\right) x y + \left(a^{4} - 3 a^{2} + 1\right) y = x^{3} + \left(a^{4} + a^{3} - 4 a^{2} - 4 a + 2\right) x^{2} + \left(-959 a^{4} - 683 a^{3} + 2238 a^{2} + 491 a - 1224\right) x - 40616 a^{4} - 34613 a^{3} + 92332 a^{2} + 42697 a - 29653 \)
magma: E := ChangeRing(EllipticCurve([a^4 - 3*a^2 + a + 1, a^4 + a^3 - 4*a^2 - 4*a + 2, a^4 - 3*a^2 + 1, -959*a^4 - 683*a^3 + 2238*a^2 + 491*a - 1224, -40616*a^4 - 34613*a^3 + 92332*a^2 + 42697*a - 29653]),K);
sage: E = EllipticCurve(K, [a^4 - 3*a^2 + a + 1, a^4 + a^3 - 4*a^2 - 4*a + 2, a^4 - 3*a^2 + 1, -959*a^4 - 683*a^3 + 2238*a^2 + 491*a - 1224, -40616*a^4 - 34613*a^3 + 92332*a^2 + 42697*a - 29653])
gp (2.8): E = ellinit([a^4 - 3*a^2 + a + 1, a^4 + a^3 - 4*a^2 - 4*a + 2, a^4 - 3*a^2 + 1, -959*a^4 - 683*a^3 + 2238*a^2 + 491*a - 1224, -40616*a^4 - 34613*a^3 + 92332*a^2 + 42697*a - 29653],K)

This is a global minimal model.

sage: E.is_global_minimal_model()

Invariants

\(\mathfrak{N} \) = \((23,-a^{4} + 3 a^{2} + 1)\) = \( \left(a^{4} - 3 a^{2} - 1\right) \)
magma: Conductor(E);
sage: E.conductor()
\(N(\mathfrak{N}) \) = \( 23 \) = \( 23 \)
magma: Norm(Conductor(E));
sage: E.conductor().norm()
\(\mathfrak{D}\) = \((529,a + 142,a^{2} + 467,a^{3} - 3 a + 443,a^{4} - 4 a^{2} + 107)\) = \( \left(a^{4} - 3 a^{2} - 1\right)^{2} \)
magma: Discriminant(E);
sage: E.discriminant()
gp (2.8): E.disc
\(N(\mathfrak{D})\) = \( 529 \) = \( 23^{2} \)
magma: Norm(Discriminant(E));
sage: E.discriminant().norm()
gp (2.8): norm(E.disc)
\(j\) = \( \frac{1812431798583025575975116650734948165}{529} a^{4} - \frac{1296559921989620389944481933388349849}{529} a^{3} - \frac{7618766625551254351602825393413091355}{529} a^{2} + \frac{3268768315434618465890517821484807321}{529} a + \frac{6367683864076909597378964320128797635}{529} \)
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: $\left(-\frac{95}{4} a^{4} + \frac{1}{4} a^{3} + \frac{303}{4} a^{2} + \frac{13}{4} a - \frac{99}{4} : \frac{137}{8} a^{4} + \frac{69}{4} a^{3} - \frac{351}{8} a^{2} - \frac{107}{4} a + \frac{157}{8} : 1\right)$
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\((j)_{-}\)
\( \left(a^{4} - 3 a^{2} - 1\right) \) \(23\) \(2\) \(I_{2}\) Split multiplicative \(-1\) \(1\) \(2\) \(2\)

Galois Representations

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

prime Image of Galois Representation
\(2\) 2B
\(5\) 5B.1.2

Isogenies and isogeny class

This curve has non-trivial cyclic isogenies of degree \(d\) for \(d=\) 2, 5 and 10.
Its isogeny class 23.1-a consists of curves linked by isogenies of degrees dividing 10.

Base change

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