Base field 4.4.9909.1
Generator \(a\), with minimal polynomial \( x^{4} - 6 x^{2} - 3 x + 3 \); class number \(1\).
sage: R.<x> = PolynomialRing(QQ); K.<a> = NumberField(R([3, -3, -6, 0, 1]))
gp: K = nfinit(Polrev([3, -3, -6, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![3, -3, -6, 0, 1]);
Weierstrass equation
sage: E = EllipticCurve([K([2,-3,-1,1]),K([1,-3,-1,1]),K([0,0,0,0]),K([-231,433,80,-90]),K([2070,-3693,-1180,813])])
gp: E = ellinit([Polrev([2,-3,-1,1]),Polrev([1,-3,-1,1]),Polrev([0,0,0,0]),Polrev([-231,433,80,-90]),Polrev([2070,-3693,-1180,813])], K);
magma: E := EllipticCurve([K![2,-3,-1,1],K![1,-3,-1,1],K![0,0,0,0],K![-231,433,80,-90],K![2070,-3693,-1180,813]]);
This is a global minimal model.
sage: E.is_global_minimal_model()
Invariants
Conductor: | \((a-3)\) | = | \((-a^3+a^2+4a)\cdot(a^3-a^2-4a+1)\) |
sage: E.conductor()
gp: ellglobalred(E)[1]
magma: Conductor(E);
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Conductor norm: | \( 21 \) | = | \(3\cdot7\) |
sage: E.conductor().norm()
gp: idealnorm(ellglobalred(E)[1])
magma: Norm(Conductor(E));
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Discriminant: | \((-3a^3+3a^2+12a-3)\) | = | \((-a^3+a^2+4a)^{4}\cdot(a^3-a^2-4a+1)\) |
sage: E.discriminant()
gp: E.disc
magma: Discriminant(E);
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Discriminant norm: | \( 567 \) | = | \(3^{4}\cdot7\) |
sage: E.discriminant().norm()
gp: norm(E.disc)
magma: Norm(Discriminant(E));
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j-invariant: | \( -\frac{15112197778035174188315}{7} a^{3} + \frac{85702869193556526085960}{21} a^{2} + \frac{36669851114797762306924}{7} a - \frac{71948817390117157608464}{21} \) | ||
sage: E.j_invariant()
gp: E.j
magma: jInvariant(E);
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Endomorphism ring: | \(\Z\) | ||
Geometric endomorphism ring: | \(\Z\) | (no potential complex multiplication) | |
sage: E.has_cm(), E.cm_discriminant()
magma: HasComplexMultiplication(E);
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Sato-Tate group: | $\mathrm{SU}(2)$ |
Mordell-Weil group
Rank: | \(1\) |
Generator | $\left(a^{3} + a^{2} - 7 a + 7 : -7 a^{3} + 6 a^{2} + 35 a - 13 : 1\right)$ |
Height | \(2.6449216975557590478754137693443769507\) |
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);
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Torsion generator: | $\left(-\frac{21}{4} a^{3} + \frac{9}{2} a^{2} + \frac{95}{4} a - \frac{53}{4} : \frac{73}{8} a^{3} - \frac{17}{2} a^{2} - \frac{137}{4} a + \frac{37}{2} : 1\right)$ |
sage: T.gens()
gp: T[3]
magma: [piT(P) : P in Generators(T)];
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BSD invariants
Analytic rank: | \( 1 \) | ||
sage: E.rank()
magma: Rank(E);
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Mordell-Weil rank: | \(1\) | ||
Regulator: | \( 2.6449216975557590478754137693443769507 \) | ||
Period: | \( 10.556533075503993706360732500370900998 \) | ||
Tamagawa product: | \( 2 \) = \(2\cdot1\) | ||
Torsion order: | \(2\) | ||
Leading coefficient: | \( 2.24392948350420 \) | ||
Analytic order of Ш: | \( 4 \) (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\((j)_{-}\) |
---|---|---|---|---|---|---|---|---|
\((-a^3+a^2+4a)\) | \(3\) | \(2\) | \(I_{4}\) | Non-split multiplicative | \(1\) | \(1\) | \(4\) | \(4\) |
\((a^3-a^2-4a+1)\) | \(7\) | \(1\) | \(I_{1}\) | Split multiplicative | \(-1\) | \(1\) | \(1\) | \(1\) |
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
21.1-b
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.