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([3,-5/2,-1/2,1/2]),K([-4,0,1,0]),K([-2,-3/2,1/2,1/2]),K([3,1/2,-3/2,-1/2]),K([2,9/2,-5/2,-3/2])])
gp: E = ellinit([Polrev([3,-5/2,-1/2,1/2]),Polrev([-4,0,1,0]),Polrev([-2,-3/2,1/2,1/2]),Polrev([3,1/2,-3/2,-1/2]),Polrev([2,9/2,-5/2,-3/2])], K);
magma: E := EllipticCurve([K![3,-5/2,-1/2,1/2],K![-4,0,1,0],K![-2,-3/2,1/2,1/2],K![3,1/2,-3/2,-1/2],K![2,9/2,-5/2,-3/2]]);
This is a global minimal model.
sage: E.is_global_minimal_model()
Invariants
| Conductor: | \((1/2a^3-1/2a^2-5/2a+1)\) | = | \((1/2a^3-1/2a^2-5/2a+1)\) |
sage: E.conductor()
gp: ellglobalred(E)[1]
magma: Conductor(E);
| |||
| Conductor norm: | \( 3 \) | = | \(3\) |
sage: E.conductor().norm()
gp: idealnorm(ellglobalred(E)[1])
magma: Norm(Conductor(E));
| |||
| Discriminant: | \((4a^2-6a-13)\) | = | \((1/2a^3-1/2a^2-5/2a+1)^{8}\) |
sage: E.discriminant()
gp: E.disc
magma: Discriminant(E);
| |||
| Discriminant norm: | \( 6561 \) | = | \(3^{8}\) |
sage: E.discriminant().norm()
gp: norm(E.disc)
magma: Norm(Discriminant(E));
| |||
| j-invariant: | \( -\frac{1432433}{13122} a^{3} + \frac{341449}{4374} a^{2} + \frac{7045667}{13122} a + \frac{12831643}{6561} \) | ||
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 | $\left(a + 1 : 0 : 1\right)$ | |
| Height | \(0.11470170991016345464116476440044602032\) | |
| Torsion structure: | \(\Z/2\Z\oplus\Z/2\Z\) | |
| sage: T = E.torsion_subgroup(); T.invariants()
gp: T = elltors(E); T[2]
magma: T,piT := TorsionSubgroup(E); Invariants(T);
| ||
| Torsion generators: | $\left(-\frac{1}{4} a^{2} : -\frac{1}{8} a^{3} - \frac{1}{4} a^{2} + \frac{1}{2} a + 1 : 1\right)$ | $\left(\frac{1}{8} a^{3} + \frac{1}{8} a^{2} - \frac{1}{8} a : -\frac{3}{8} a^{3} - \frac{1}{2} a^{2} + \frac{5}{4} a + \frac{9}{8} : 1\right)$ |
| 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: | \( 0.11470170991016345464116476440044602032 \) | ||
| Period: | \( 1379.0700360493683715292218262826953405 \) | ||
| Tamagawa product: | \( 8 \) | ||
| Torsion order: | \(4\) | ||
| Leading coefficient: | \( 2.35170540334628 \) | ||
| 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 | \(-1\) | \(1\) | \(8\) | \(8\) |
Galois Representations
The mod \( p \) Galois Representation has maximal image for all primes \( p < 1000 \) except those listed.
| prime | Image of Galois Representation |
|---|---|
| \(2\) | 2Cs |
Isogenies and isogeny class
This curve has non-trivial cyclic isogenies of degree \(d\) for \(d=\)
2 and 4.
Its isogeny class
3.1-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.