Base field 6.6.300125.1
Generator \(a\), with minimal polynomial \( x^{6} - x^{5} - 7 x^{4} + 2 x^{3} + 7 x^{2} - 2 x - 1 \); class number \(1\).
sage: R.<x> = PolynomialRing(QQ); K.<a> = NumberField(R([-1, -2, 7, 2, -7, -1, 1]))
gp: K = nfinit(Polrev([-1, -2, 7, 2, -7, -1, 1]));
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-1, -2, 7, 2, -7, -1, 1]);
Weierstrass equation
sage: E = EllipticCurve([K([-4,-18,13,29,1,-4]),K([-5,-17,14,23,0,-3]),K([-5,-16,14,23,0,-3]),K([-1190,-4145,1280,7943,784,-1192]),K([-7572,-35243,-11460,88506,14083,-14256])])
gp: E = ellinit([Polrev([-4,-18,13,29,1,-4]),Polrev([-5,-17,14,23,0,-3]),Polrev([-5,-16,14,23,0,-3]),Polrev([-1190,-4145,1280,7943,784,-1192]),Polrev([-7572,-35243,-11460,88506,14083,-14256])], K);
magma: E := EllipticCurve([K![-4,-18,13,29,1,-4],K![-5,-17,14,23,0,-3],K![-5,-16,14,23,0,-3],K![-1190,-4145,1280,7943,784,-1192],K![-7572,-35243,-11460,88506,14083,-14256]]);
This is a global minimal model.
sage: E.is_global_minimal_model()
Invariants
| Conductor: | \((-2a^5+a^4+14a^3+4a^2-9a-4)\) | = | \((-2a^5+a^4+14a^3+4a^2-9a-4)\) |
sage: E.conductor()
gp: ellglobalred(E)[1]
magma: Conductor(E);
| |||
| Conductor norm: | \( 71 \) | = | \(71\) |
sage: E.conductor().norm()
gp: idealnorm(ellglobalred(E)[1])
magma: Norm(Conductor(E));
| |||
| Discriminant: | \((257a^5-48a^4-1851a^3-995a^2+1136a+414)\) | = | \((-2a^5+a^4+14a^3+4a^2-9a-4)^{6}\) |
sage: E.discriminant()
gp: E.disc
magma: Discriminant(E);
| |||
| Discriminant norm: | \( -128100283921 \) | = | \(-71^{6}\) |
sage: E.discriminant().norm()
gp: norm(E.disc)
magma: Norm(Discriminant(E));
| |||
| j-invariant: | \( \frac{13095517607526612645584064951122712336}{128100283921} a^{5} - \frac{3665528766419602968970206427128430838}{128100283921} a^{4} - \frac{1328283723625316342810710439778618405}{1804229351} a^{3} - \frac{41719587011381709944839357304641516914}{128100283921} a^{2} + \frac{61626646160707263603014646395583798619}{128100283921} a + \frac{18185873207131769963818333659583160916}{128100283921} \) | ||
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: | $\left(-\frac{69}{2} a^{5} + \frac{69}{4} a^{4} + \frac{957}{4} a^{3} + 64 a^{2} - \frac{585}{4} a - \frac{113}{4} : \frac{93}{8} a^{5} - \frac{43}{8} a^{4} - \frac{653}{8} a^{3} - \frac{45}{2} a^{2} + \frac{407}{8} a + 6 : 1\right)$ |
| 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: | \( 17.453991076494173830754514184312645251 \) | ||
| Tamagawa product: | \( 2 \) | ||
| Torsion order: | \(2\) | ||
| Leading coefficient: | \( 1.29032 \) | ||
| Analytic order of Ш: | \( 81 \) (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\((j)_{-}\) |
|---|---|---|---|---|---|---|---|---|
| \((-2a^5+a^4+14a^3+4a^2-9a-4)\) | \(71\) | \(2\) | \(I_{6}\) | Non-split multiplicative | \(1\) | \(1\) | \(6\) | \(6\) |
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 |
| \(3\) | 3B.1.2 |
Isogenies and isogeny class
This curve has non-trivial cyclic isogenies of degree \(d\) for \(d=\)
2, 3 and 6.
Its isogeny class
71.2-c
consists of curves linked by isogenies of
degrees dividing 6.
Base change
This elliptic curve is not a \(\Q\)-curve.
It is not the base change of an elliptic curve defined over any subfield.