Minimal Weierstrass equation
\(y^2+y=x^3+x^2+x\)
Mordell-Weil group structure
\(\Z/{3}\Z\)
Torsion generators
\( \left(0, 0\right) \)
Integral points
\( \left(0, 0\right) \), \( \left(0, -1\right) \)
Invariants
sage: E.conductor().factor()
gp: ellglobalred(E)[1]
magma: Conductor(E);
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Conductor: | \( 19 \) | = | \(19\) |
sage: E.discriminant().factor()
gp: E.disc
magma: Discriminant(E);
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Discriminant: | \(-19 \) | = | \(-1 \cdot 19 \) |
sage: E.j_invariant().factor()
gp: E.j
magma: jInvariant(E);
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j-invariant: | \( \frac{32768}{19} \) | = | \(2^{15} \cdot 19^{-1}\) |
Endomorphism ring: | \(\Z\) | ||
Geometric endomorphism ring: | \(\Z\) | (no potential complex multiplication) | |
Sato-Tate group: | $\mathrm{SU}(2)$ | ||
Faltings height: | \(-1.0651731316767918878751503533\dots\) | ||
Stable Faltings height: | \(-1.0651731316767918878751503533\dots\) |
BSD invariants
sage: E.rank()
magma: Rank(E);
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Analytic rank: | \(0\) | ||
sage: E.regulator()
magma: Regulator(E);
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Regulator: | \(1\) | ||
sage: E.period_lattice().omega()
gp: E.omega[1]
magma: RealPeriod(E);
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Real period: | \(4.0792792004649324322095526836\dots\) | ||
sage: E.tamagawa_numbers()
gp: gr=ellglobalred(E); [[gr[4][i,1],gr[5][i][4]] | i<-[1..#gr[4][,1]]]
magma: TamagawaNumbers(E);
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Tamagawa product: | \( 1 \) | ||
sage: E.torsion_order()
gp: elltors(E)[1]
magma: Order(TorsionSubgroup(E));
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Torsion order: | \(3\) | ||
sage: E.sha().an_numerical()
magma: MordellWeilShaInformation(E);
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Analytic order of Ш: | \(1\) (exact) |
Modular invariants

For more coefficients, see the Downloads section to the right.
sage: E.modular_degree()
magma: ModularDegree(E);
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Modular degree: | 3 | ||
\( \Gamma_0(N) \)-optimal: | no | ||
Manin constant: | 3 |
Special L-value
\( L(E,1) \) ≈ \( 0.45325324449610360357883918706482153450 \)
Local data
This elliptic curve is semistable. There is only one prime of bad reduction:
prime | Tamagawa number | Kodaira symbol | Reduction type | Root number | ord(\(N\)) | ord(\(\Delta\)) | ord\((j)_{-}\) |
---|---|---|---|---|---|---|---|
\(19\) | \(1\) | \(I_{1}\) | Split multiplicative | -1 | 1 | 1 | 1 |
Galois representations
The 2-adic representation attached to this elliptic curve is surjective.
The mod \( p \) Galois representation has maximal image \(\GL(2,\F_p)\) for all primes \( p \) except those listed.
prime | Image of Galois representation |
---|---|
\(3\) | B.1.1 |
$p$-adic data
$p$-adic regulators
All \(p\)-adic regulators are identically \(1\) since the rank is \(0\).
Iwasawa invariants
$p$ | 2 | 3 | 19 |
---|---|---|---|
Reduction type | ss | ordinary | split |
$\lambda$-invariant(s) | 0,3 | 0 | 1 |
$\mu$-invariant(s) | 0,0 | 0 | 0 |
All Iwasawa $\lambda$ and $\mu$-invariants for primes $p\ge 5$ of good reduction are zero.
Isogenies
This curve has non-trivial cyclic isogenies of degree \(d\) for \(d=\)
3 and 9.
Its isogeny class 19a
consists of 3 curves linked by isogenies of
degrees dividing 9.
Growth of torsion in number fields
The number fields $K$ of degree less than 24 such that $E(K)_{\rm tors}$ is strictly larger than $E(\Q)_{\rm tors}$ $\cong \Z/{3}\Z$ are as follows:
$[K:\Q]$ | $K$ | $E(K)_{\rm tors}$ | Base change curve |
---|---|---|---|
$3$ | 3.1.76.1 | \(\Z/6\Z\) | Not in database |
$3$ | 3.3.361.1 | \(\Z/9\Z\) | 3.3.361.1-19.1-a3 |
$6$ | 6.0.109744.2 | \(\Z/2\Z \times \Z/6\Z\) | Not in database |
$6$ | 6.0.3518667.2 | \(\Z/3\Z \times \Z/3\Z\) | Not in database |
$6$ | 6.0.9747.1 | \(\Z/9\Z\) | Not in database |
$9$ | 9.3.57207791296.1 | \(\Z/18\Z\) | Not in database |
$12$ | 12.2.937292452593664.2 | \(\Z/12\Z\) | Not in database |
$18$ | 18.0.43564677551979246963.1 | \(\Z/3\Z \times \Z/9\Z\) | Not in database |
$18$ | 18.0.64417171850299425397321728.2 | \(\Z/3\Z \times \Z/6\Z\) | Not in database |
$18$ | 18.0.494296175215808851968.1 | \(\Z/18\Z\) | Not in database |
$18$ | 18.0.62181896314367173832704.1 | \(\Z/2\Z \times \Z/18\Z\) | Not in database |
We only show fields where the torsion growth is primitive.