Base field 6.6.485125.1
Generator \(a\), with minimal polynomial \( x^{6} - 2 x^{5} - 4 x^{4} + 8 x^{3} + 2 x^{2} - 5 x + 1 \); class number \(1\).
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![1, -5, 2, 8, -4, -2, 1]);
sage: x = polygen(QQ); K.<a> = NumberField(x^6 - 2*x^5 - 4*x^4 + 8*x^3 + 2*x^2 - 5*x + 1)
gp (2.8): K = nfinit(a^6 - 2*a^5 - 4*a^4 + 8*a^3 + 2*a^2 - 5*a + 1);
Weierstrass equation
magma: E := ChangeRing(EllipticCurve([2*a^5 - 2*a^4 - 9*a^3 + 7*a^2 + 8*a - 3, -a^4 + 4*a^2 + a - 2, -a^5 + 2*a^4 + 4*a^3 - 6*a^2 - 2*a + 2, -96*a^5 + 119*a^4 + 476*a^3 - 414*a^2 - 511*a + 108, 463*a^5 - 597*a^4 - 2282*a^3 + 2083*a^2 + 2445*a - 594]),K);
sage: E = EllipticCurve(K, [2*a^5 - 2*a^4 - 9*a^3 + 7*a^2 + 8*a - 3, -a^4 + 4*a^2 + a - 2, -a^5 + 2*a^4 + 4*a^3 - 6*a^2 - 2*a + 2, -96*a^5 + 119*a^4 + 476*a^3 - 414*a^2 - 511*a + 108, 463*a^5 - 597*a^4 - 2282*a^3 + 2083*a^2 + 2445*a - 594])
gp (2.8): E = ellinit([2*a^5 - 2*a^4 - 9*a^3 + 7*a^2 + 8*a - 3, -a^4 + 4*a^2 + a - 2, -a^5 + 2*a^4 + 4*a^3 - 6*a^2 - 2*a + 2, -96*a^5 + 119*a^4 + 476*a^3 - 414*a^2 - 511*a + 108, 463*a^5 - 597*a^4 - 2282*a^3 + 2083*a^2 + 2445*a - 594],K)
This is a global minimal model.
sage: E.is_global_minimal_model()
Invariants
| \(\mathfrak{N} \) | = | \((3,-a^{2} + 2)\) | = | \( \left(a^{2} - 2\right) \) |
| magma: Conductor(E);
sage: E.conductor()
| ||||
| \(N(\mathfrak{N}) \) | = | \( 9 \) | = | \( 9 \) |
| magma: Norm(Conductor(E));
sage: E.conductor().norm()
| ||||
| \(\mathfrak{D}\) | = | \((729,729 a^{5} - 729 a^{4} - 3645 a^{3} + 2916 a^{2} + 3645 a - 1458,156 a^{5} - 155 a^{4} - 781 a^{3} + 621 a^{2} + 782 a + 134,44 a^{5} - 44 a^{4} - 219 a^{3} + 175 a^{2} + 217 a + 381,511 a^{5} - 511 a^{4} - 2555 a^{3} + 2044 a^{2} + 2556 a - 979,384 a^{5} - 384 a^{4} - 1920 a^{3} + 1537 a^{2} + 1920 a - 569)\) | = | \( \left(a^{2} - 2\right)^{6} \) |
| magma: Discriminant(E);
sage: E.discriminant()
gp (2.8): E.disc
| ||||
| \(N(\mathfrak{D})\) | = | \( 531441 \) | = | \( 9^{6} \) |
| magma: Norm(Discriminant(E));
sage: E.discriminant().norm()
gp (2.8): norm(E.disc)
| ||||
| \(j\) | = | \( \frac{28415401415371915}{729} a^{5} - \frac{83236468416132128}{729} a^{4} - \frac{36313576737257882}{729} a^{3} + \frac{261074947130156095}{729} a^{2} - \frac{185789098122198698}{729} a + \frac{10192405658194375}{243} \) | ||
| 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: | $\left(a^{5} - \frac{1}{4} a^{4} - \frac{11}{2} a^{3} - a^{2} + \frac{27}{4} a + 3 : -\frac{9}{4} a^{5} + \frac{15}{4} a^{4} + \frac{95}{8} a^{3} - \frac{117}{8} a^{2} - \frac{117}{8} a + \frac{43}{8} : 1\right)$ |
| 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\((j)_{-}\) |
|---|---|---|---|---|---|---|---|---|
| \( \left(a^{2} - 2\right) \) | \(9\) | \(2\) | \(I_{6}\) | Non-split multiplicative | \(1\) | \(1\) | \(6\) | \(6\) |
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
9.1-a
consists of curves linked by isogenies of
degrees dividing 6.