Minimal Weierstrass equation
magma: E := EllipticCurve("6930h3");
sage: E = EllipticCurve("6930h3")
gp: E = ellinit("6930h3")
\( y^2 + x y = x^{3} - x^{2} - 810 x + 73440 \)
Mordell-Weil group structure
Torsion generators
\( \left(78, 654\right) \)
Integral points
\( \left(-48, 24\right) \), \( \left(1, 269\right) \), \( \left(78, 654\right) \)
Invariants
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magma: Conductor(E);
sage: E.conductor().factor()
gp: ellglobalred(E)[1]
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| Conductor: | \( 6930 \) | = | \(2 \cdot 3^{2} \cdot 5 \cdot 7 \cdot 11\) | ||
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magma: Discriminant(E);
sage: E.discriminant().factor()
gp: E.disc
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| Discriminant: | \(-2283094141020 \) | = | \(-1 \cdot 2^{2} \cdot 3^{6} \cdot 5 \cdot 7^{6} \cdot 11^{3} \) | ||
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magma: jInvariant(E);
sage: E.j_invariant().factor()
gp: E.j
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| j-invariant: | \( -\frac{80677568161}{3131816380} \) | = | \(-1 \cdot 2^{-2} \cdot 5^{-1} \cdot 7^{-6} \cdot 11^{-3} \cdot 29^{3} \cdot 149^{3}\) | ||
| Endomorphism ring: | \(\Z\) | (no Complex Multiplication) | |||
| Sato-Tate Group: | $\mathrm{SU}(2)$ | ||||
BSD invariants
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magma: Rank(E);
sage: E.rank()
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| Rank: | \(0\) | ||
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magma: Regulator(E);
sage: E.regulator()
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| Regulator: | \(1\) | ||
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magma: RealPeriod(E);
sage: E.period_lattice().omega()
gp: E.omega[1]
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| Real period: | \(0.682020814957\) | ||
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magma: TamagawaNumbers(E);
sage: E.tamagawa_numbers()
gp: gr=ellglobalred(E); [[gr[4][i,1],gr[5][i][4]] | i<-[1..#gr[4][,1]]]
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| Tamagawa product: | \( 72 \) = \( 2\cdot2\cdot1\cdot( 2 \cdot 3 )\cdot3 \) | ||
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magma: Order(TorsionSubgroup(E));
sage: E.torsion_order()
gp: elltors(E)[1]
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| Torsion order: | \(6\) | ||
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magma: MordellWeilShaInformation(E);
sage: E.sha().an_numerical()
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| Analytic order of Ш: | \(1\) (exact) | ||
Modular invariants
Modular form 6930.2.a.f
gp: x*deriv(xy[1])/(2*xy[2]+E.a1*xy[1]+E.a3)
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magma: ModularDegree(E);
sage: E.modular_degree()
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| Modular degree: | 13824 | ||
| \( \Gamma_0(N) \)-optimal: | no | ||
| Manin constant: | 1 | ||
Special L-value
sage: E.lseries().dokchitser().derivative(1,r)/r.factorial()
gp: ar[2]/factorial(ar[1])
\( L(E,1) \) ≈ \( 1.36404162991 \)
Local data
| prime | Tamagawa number | Kodaira symbol | Reduction type | Root number | ord(\(N\)) | ord(\(\Delta\)) | ord\((j)_{-}\) |
|---|---|---|---|---|---|---|---|
| \(2\) | \(2\) | \( I_{2} \) | Non-split multiplicative | 1 | 1 | 2 | 2 |
| \(3\) | \(2\) | \( I_0^{*} \) | Additive | -1 | 2 | 6 | 0 |
| \(5\) | \(1\) | \( I_{1} \) | Non-split multiplicative | 1 | 1 | 1 | 1 |
| \(7\) | \(6\) | \( I_{6} \) | Split multiplicative | -1 | 1 | 6 | 6 |
| \(11\) | \(3\) | \( I_{3} \) | Split multiplicative | -1 | 1 | 3 | 3 |
Galois representations
The image of the 2-adic representation attached to this elliptic curve is the subgroup of $\GL(2,\Z_2)$ with Rouse label X6.
This subgroup is the pull-back of the subgroup of $\GL(2,\Z_2/2^1\Z_2)$ generated by $\left(\begin{array}{rr} 1 & 1 \\ 0 & 1 \end{array}\right)$ and has index 3.
sage: [rho.image_type(p) for p in rho.non_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 |
|---|---|
| \(2\) | B |
| \(3\) | 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 | 5 | 7 | 11 |
|---|---|---|---|---|---|
| Reduction type | nonsplit | add | nonsplit | split | split |
| $\lambda$-invariant(s) | 4 | - | 0 | 1 | 1 |
| $\mu$-invariant(s) | 0 | - | 0 | 0 | 0 |
All Iwasawa $\lambda$ and $\mu$-invariants for primes $p\ge 5$ of good reduction are zero.
An entry - indicates that the invariants are not computed because the reduction is additive.
Isogenies
This curve has non-trivial cyclic isogenies of degree \(d\) for \(d=\)
2, 3 and 6.
Its isogeny class 6930h
consists of 4 curves linked by isogenies of
degrees dividing 6.
Growth of torsion in number fields
The number fields $K$ of degree up to 7 such that $E(K)_{\rm tors}$ is strictly larger than $E(\Q)_{\rm tors}$ $\cong \Z/{6}\Z$ are as follows:
| $[K:\Q]$ | $K$ | $E(K)_{\rm tors}$ | Base-change curve |
|---|---|---|---|
| 2 | \(\Q(\sqrt{-55}) \) | \(\Z/2\Z \times \Z/6\Z\) | Not in database |
| 4 | 4.2.1552320.1 | \(\Z/12\Z\) | Not in database |
| 6 | 6.0.21870000.2 | \(\Z/3\Z \times \Z/6\Z\) | Not in database |
We only show fields where the torsion growth is primitive. For each field $K$ we either show its label, or a defining polynomial when $K$ is not in the database.