Base field 6.6.592661.1
Generator \(a\), with minimal polynomial \( x^{6} - x^{5} - 5 x^{4} + 4 x^{3} + 5 x^{2} - 2 x - 1 \); class number \(1\).
sage: R.<x> = PolynomialRing(QQ); K.<a> = NumberField(R([-1, -2, 5, 4, -5, -1, 1]))
gp: K = nfinit(Polrev([-1, -2, 5, 4, -5, -1, 1]));
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-1, -2, 5, 4, -5, -1, 1]);
Weierstrass equation
sage: E = EllipticCurve([K([-2,1,1,-4,0,1]),K([-3,0,5,0,-1,0]),K([-2,6,4,-9,-1,2]),K([37,13,-318,210,84,-60]),K([319,208,-2098,1214,547,-358])])
gp: E = ellinit([Polrev([-2,1,1,-4,0,1]),Polrev([-3,0,5,0,-1,0]),Polrev([-2,6,4,-9,-1,2]),Polrev([37,13,-318,210,84,-60]),Polrev([319,208,-2098,1214,547,-358])], K);
magma: E := EllipticCurve([K![-2,1,1,-4,0,1],K![-3,0,5,0,-1,0],K![-2,6,4,-9,-1,2],K![37,13,-318,210,84,-60],K![319,208,-2098,1214,547,-358]]);
This is a global minimal model.
sage: E.is_global_minimal_model()
Invariants
| Conductor: | \((a^5-a^4-4a^3+4a^2-2)\) | = | \((a^5-a^4-4a^3+4a^2-2)\) |
sage: E.conductor()
gp: ellglobalred(E)[1]
magma: Conductor(E);
| |||
| Conductor norm: | \( 47 \) | = | \(47\) |
sage: E.conductor().norm()
gp: idealnorm(ellglobalred(E)[1])
magma: Norm(Conductor(E));
| |||
| Discriminant: | \((-3a^5+12a^4+10a^3-54a^2+3a+20)\) | = | \((a^5-a^4-4a^3+4a^2-2)^{4}\) |
sage: E.discriminant()
gp: E.disc
magma: Discriminant(E);
| |||
| Discriminant norm: | \( 4879681 \) | = | \(47^{4}\) |
sage: E.discriminant().norm()
gp: norm(E.disc)
magma: Norm(Discriminant(E));
| |||
| j-invariant: | \( -\frac{239523065600391312345982}{4879681} a^{5} - \frac{92745950730456822976455}{4879681} a^{4} + \frac{1069070700534264670095929}{4879681} a^{3} + \frac{524880302626165548039899}{4879681} a^{2} - \frac{469955941031294527229375}{4879681} a - \frac{172733643671563536452835}{4879681} \) | ||
sage: E.j_invariant()
gp: E.j
magma: jInvariant(E);
| |||
| Endomorphism ring: | \(\Z\) | ||
| Geometric endomorphism ring: | \(\Z\) | (no potential complex multiplication) | |
sage: E.has_cm(), E.cm_discriminant()
magma: HasComplexMultiplication(E);
| |||
| Sato-Tate group: | $\mathrm{SU}(2)$ | ||
Mordell-Weil group
| Rank: | \(0\) |
| Torsion structure: | \(\Z/2\Z\) |
| sage: T = E.torsion_subgroup(); T.invariants()
gp: T = elltors(E); T[2]
magma: T,piT := TorsionSubgroup(E); Invariants(T);
| |
| Torsion generator: | $\left(-\frac{7}{2} a^{5} + \frac{9}{2} a^{4} + \frac{27}{2} a^{3} - \frac{73}{4} a^{2} - \frac{21}{4} a + 4 : \frac{1}{8} a^{5} + \frac{35}{8} a^{4} + \frac{23}{8} a^{3} - \frac{113}{8} a^{2} - \frac{47}{8} a + \frac{19}{4} : 1\right)$ |
| sage: T.gens()
gp: T[3]
magma: [piT(P) : P in Generators(T)];
| |
BSD invariants
| Analytic rank: | \( 0 \) | ||
|
sage: E.rank()
magma: Rank(E);
|
|||
| Mordell-Weil rank: | \(0\) | ||
| Regulator: | \( 1 \) | ||
| Period: | \( 32.655676364771596389810856523958810966 \) | ||
| Tamagawa product: | \( 2 \) | ||
| Torsion order: | \(2\) | ||
| Leading coefficient: | \( 1.35739 \) | ||
| Analytic order of Ш: | \( 64 \) (rounded) | ||
Local data at primes of bad reduction
sage: E.local_data()
magma: LocalInformation(E);
| prime | Norm | Tamagawa number | Kodaira symbol | Reduction type | Root number | ord(\(\mathfrak{N}\)) | ord(\(\mathfrak{D}\)) | ord\((j)_{-}\) |
|---|---|---|---|---|---|---|---|---|
| \((a^5-a^4-4a^3+4a^2-2)\) | \(47\) | \(2\) | \(I_{4}\) | Non-split multiplicative | \(1\) | \(1\) | \(4\) | \(4\) |
Galois Representations
The mod \( p \) Galois Representation has maximal image for all primes \( p < 1000 \) 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 and 4.
Its isogeny class
47.1-a
consists of curves linked by isogenies of
degrees dividing 4.
Base change
This elliptic curve is not a \(\Q\)-curve.
It is not the base change of an elliptic curve defined over any subfield.