Base field \(\Q(\sqrt{55}) \)
Generator \(a\), with minimal polynomial \( x^{2} - 55 \); class number \(2\).
sage: R.<x> = PolynomialRing(QQ); K.<a> = NumberField(R([-55, 0, 1]))
gp: K = nfinit(Polrev([-55, 0, 1]));
magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-55, 0, 1]);
Weierstrass equation
sage: E = EllipticCurve([K([1,0]),K([1,1]),K([1,1]),K([-954,-127]),K([-4928,-662])])
gp: E = ellinit([Polrev([1,0]),Polrev([1,1]),Polrev([1,1]),Polrev([-954,-127]),Polrev([-4928,-662])], K);
magma: E := EllipticCurve([K![1,0],K![1,1],K![1,1],K![-954,-127],K![-4928,-662]]);
This is not a global minimal model: it is minimal at all primes except \((3,a+2)\). No global minimal model exists.
sage: E.is_global_minimal_model()
Invariants
Conductor: | \((3)\) | = | \((3,a+1)\cdot(3,a+2)\) |
sage: E.conductor()
gp: ellglobalred(E)[1]
magma: Conductor(E);
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Conductor norm: | \( 9 \) | = | \(3\cdot3\) |
sage: E.conductor().norm()
gp: idealnorm(ellglobalred(E)[1])
magma: Norm(Conductor(E));
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Discriminant: | \((-21663a+239148)\) | = | \((3,a+1)^{2}\cdot(3,a+2)^{20}\) |
sage: E.discriminant()
gp: E.disc
magma: Discriminant(E);
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Discriminant norm: | \( 31381059609 \) | = | \(3^{2}\cdot3^{20}\) |
sage: E.discriminant().norm()
gp: norm(E.disc)
magma: Norm(Discriminant(E));
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Minimal discriminant: | \((9a-252)\) | = | \((3,a+1)^{2}\cdot(3,a+2)^{8}\) |
Minimal discriminant norm: | \( 59049 \) | = | \(3^{2}\cdot3^{8}\) |
j-invariant: | \( -\frac{15187448053921}{6561} a + \frac{112633140823016}{6561} \) | ||
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 | $\left(-\frac{4}{3} a - \frac{98}{9} : \frac{32}{3} a + \frac{2236}{27} : 1\right)$ |
Height | \(2.9221340518765283234813969703144941378\) |
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: | $\left(-3 a - \frac{93}{4} : a + \frac{89}{8} : 1\right)$ |
sage: T.gens()
gp: T[3]
magma: [piT(P) : P in Generators(T)];
|
BSD invariants
Analytic rank: | \( 1 \) | ||
sage: E.rank()
magma: Rank(E);
|
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Mordell-Weil rank: | \(1\) | ||
Regulator: | \( 2.9221340518765283234813969703144941378 \) | ||
Period: | \( 4.8524676122137876568135242760404296636 \) | ||
Tamagawa product: | \( 4 \) = \(2\cdot2\) | ||
Torsion order: | \(2\) | ||
Leading coefficient: | \( 1.9119715943351062664152912927928262491 \) | ||
Analytic order of Ш: | \( 1 \) (rounded) |
Local data at primes of bad reduction
sage: E.local_data()
magma: LocalInformation(E);
Primes of good reduction for the curve but which divide the
discriminant of the model above (if any) are included.
prime | Norm | Tamagawa number | Kodaira symbol | Reduction type | Root number | ord(\(\mathfrak{N}\)) | ord(\(\mathfrak{D}\)) | ord\((j)_{-}\) |
---|---|---|---|---|---|---|---|---|
\((3,a+1)\) | \(3\) | \(2\) | \(I_{2}\) | Split multiplicative | \(-1\) | \(1\) | \(2\) | \(2\) |
\((3,a+2)\) | \(3\) | \(2\) | \(I_{8}\) | Non-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 |
---|---|
\(2\) | 2B |
Isogenies and isogeny class
This curve has non-trivial cyclic isogenies of degree \(d\) for \(d=\)
2 and 4.
Its isogeny class
9.1-a
consists of curves linked by isogenies of
degrees dividing 4.
Base change
This elliptic curve is a \(\Q\)-curve.
It is not the base change of an elliptic curve defined over any subfield.