Base field 4.4.18097.1
Generator \(a\), with minimal polynomial \( x^{4} - x^{3} - 7 x^{2} + 6 x + 4 \); class number \(1\).
sage: R.<x> = PolynomialRing(QQ); K.<a> = NumberField(R([4, 6, -7, -1, 1]))
gp: K = nfinit(Polrev([4, 6, -7, -1, 1]));
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![4, 6, -7, -1, 1]);
Weierstrass equation
sage: E = EllipticCurve([K([-1,-5/2,1/2,1/2]),K([1,-5/2,-1/2,1/2]),K([1,0,0,0]),K([163,687/2,-105/2,-81/2]),K([480,1913/2,-537/2,-135/2])])
gp: E = ellinit([Polrev([-1,-5/2,1/2,1/2]),Polrev([1,-5/2,-1/2,1/2]),Polrev([1,0,0,0]),Polrev([163,687/2,-105/2,-81/2]),Polrev([480,1913/2,-537/2,-135/2])], K);
magma: E := EllipticCurve([K![-1,-5/2,1/2,1/2],K![1,-5/2,-1/2,1/2],K![1,0,0,0],K![163,687/2,-105/2,-81/2],K![480,1913/2,-537/2,-135/2]]);
This is a global minimal model.
sage: E.is_global_minimal_model()
Invariants
| Conductor: | \((-a-2)\) | = | \((1/2a^3-1/2a^2-5/2a+1)\cdot(a)\) |
sage: E.conductor()
gp: ellglobalred(E)[1]
magma: Conductor(E);
| |||
| Conductor norm: | \( 12 \) | = | \(3\cdot4\) |
sage: E.conductor().norm()
gp: idealnorm(ellglobalred(E)[1])
magma: Norm(Conductor(E));
| |||
| Discriminant: | \((-5a^3+a^2+24a-8)\) | = | \((1/2a^3-1/2a^2-5/2a+1)^{8}\cdot(a)^{2}\) |
sage: E.discriminant()
gp: E.disc
magma: Discriminant(E);
| |||
| Discriminant norm: | \( -104976 \) | = | \(-3^{8}\cdot4^{2}\) |
sage: E.discriminant().norm()
gp: norm(E.disc)
magma: Norm(Discriminant(E));
| |||
| j-invariant: | \( \frac{2757970737714201205}{52488} a^{3} - \frac{1334205989042635679}{17496} a^{2} - \frac{17499449907519419455}{52488} a + \frac{12222583887443291953}{26244} \) | ||
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: | \(1\) |
| Generator | $\left(-a^{2} + 2 a + 1 : 5 a^{3} + 2 a^{2} - 32 a - 15 : 1\right)$ |
| Height | \(0.72148893907722958388155153276691542837\) |
| 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: | $\left(\frac{3}{8} a^{3} - \frac{7}{8} a^{2} - \frac{5}{8} a - 1 : \frac{1}{2} a^{3} + \frac{3}{4} a^{2} - 3 a - \frac{15}{8} : 1\right)$ |
| sage: T.gens()
gp: T[3]
magma: [piT(P) : P in Generators(T)];
| |
BSD invariants
| Analytic rank: | \( 1 \) | ||
|
sage: E.rank()
magma: Rank(E);
|
|||
| Mordell-Weil rank: | \(1\) | ||
| Regulator: | \( 0.72148893907722958388155153276691542837 \) | ||
| Period: | \( 40.231299171930987209164867418554371713 \) | ||
| Tamagawa product: | \( 16 \) = \(2^{3}\cdot2\) | ||
| Torsion order: | \(2\) | ||
| Leading coefficient: | \( 3.45231507116428 \) | ||
| Analytic order of Ш: | \( 1 \) (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\((j)_{-}\) |
|---|---|---|---|---|---|---|---|---|
| \((1/2a^3-1/2a^2-5/2a+1)\) | \(3\) | \(8\) | \(I_{8}\) | Split multiplicative | \(-1\) | \(1\) | \(8\) | \(8\) |
| \((a)\) | \(4\) | \(2\) | \(I_{2}\) | Non-split multiplicative | \(1\) | \(1\) | \(2\) | \(2\) |
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, 4 and 8.
Its isogeny class
12.1-b
consists of curves linked by isogenies of
degrees dividing 8.
Base change
This elliptic curve is not a \(\Q\)-curve.
It is not the base change of an elliptic curve defined over any subfield.