Minimal Weierstrass equation
Minimal Weierstrass equation
Simplified equation
\(y^2+xy=x^3-x^2+40x-428\) | (homogenize, simplify) |
\(y^2z+xyz=x^3-x^2z+40xz^2-428z^3\) | (dehomogenize, simplify) |
\(y^2=x^3+637x-26754\) | (homogenize, minimize) |
Mordell-Weil group structure
\(\Z \oplus \Z\)
Infinite order Mordell-Weil generators and heights
$P$ | = | \(\left(9, 20\right)\) | \(\left(58, 412\right)\) |
$\hat{h}(P)$ | ≈ | $0.72487971357821027937983371196$ | $1.8418059803949774942195511051$ |
Integral points
\( \left(6, -2\right) \), \( \left(6, -4\right) \), \( \left(9, 20\right) \), \( \left(9, -29\right) \), \( \left(13, 40\right) \), \( \left(13, -53\right) \), \( \left(24, 106\right) \), \( \left(24, -130\right) \), \( \left(58, 412\right) \), \( \left(58, -470\right) \), \( \left(4819, 332095\right) \), \( \left(4819, -336914\right) \)
Invariants
Conductor: | \( 16562 \) | = | $2 \cdot 7^{2} \cdot 13^{2}$ | comment: Conductor
sage: E.conductor().factor()
gp: ellglobalred(E)[1]
magma: Conductor(E);
oscar: conductor(E)
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Discriminant: | $-79530724 $ | = | $-1 \cdot 2^{2} \cdot 7^{6} \cdot 13^{2} $ | comment: Discriminant
sage: E.discriminant().factor()
gp: E.disc
magma: Discriminant(E);
oscar: discriminant(E)
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j-invariant: | \( \frac{351}{4} \) | = | $2^{-2} \cdot 3^{3} \cdot 13$ | comment: j-invariant
sage: E.j_invariant().factor()
gp: E.j
magma: jInvariant(E);
oscar: j_invariant(E)
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Endomorphism ring: | $\Z$ | |||
Geometric endomorphism ring: | \(\Z\) | (no potential complex multiplication) | sage: E.has_cm()
magma: HasComplexMultiplication(E);
| |
Sato-Tate group: | $\mathrm{SU}(2)$ | |||
Faltings height: | $0.19692715976046742356538991288\dots$ | gp: ellheight(E)
magma: FaltingsHeight(E);
oscar: faltings_height(E)
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Stable Faltings height: | $-1.2035194743441120183295343658\dots$ | magma: StableFaltingsHeight(E);
oscar: stable_faltings_height(E)
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$abc$ quality: | $1.2727904629543532\dots$ | |||
Szpiro ratio: | $2.6345455931732404\dots$ |
BSD invariants
Analytic rank: | $2$ | sage: E.analytic_rank()
gp: ellanalyticrank(E)
magma: AnalyticRank(E);
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Regulator: | $1.2852721026910001328852141281\dots$ | comment: Regulator
sage: E.regulator()
G = E.gen \\ if available
magma: Regulator(E);
|
Real period: | $0.94866623649257864374575290893\dots$ | comment: Real Period
sage: E.period_lattice().omega()
gp: if(E.disc>0,2,1)*E.omega[1]
magma: (Discriminant(E) gt 0 select 2 else 1) * RealPeriod(E);
|
Tamagawa product: | $ 4 $ = $ 2\cdot2\cdot1 $ | comment: Tamagawa numbers
sage: E.tamagawa_numbers()
gp: gr=ellglobalred(E); [[gr[4][i,1],gr[5][i][4]] | i<-[1..#gr[4][,1]]]
magma: TamagawaNumbers(E);
oscar: tamagawa_numbers(E)
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Torsion order: | $1$ | comment: Torsion order
sage: E.torsion_order()
gp: elltors(E)[1]
magma: Order(TorsionSubgroup(E));
oscar: prod(torsion_structure(E)[1])
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Analytic order of Ш: | $1$ ( rounded) | comment: Order of Sha
sage: E.sha().an_numerical()
magma: MordellWeilShaInformation(E);
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Special value: | $ L^{(2)}(E,1)/2! $ ≈ $ 4.8771769941150966253100032404 $ | comment: Special L-value
r = E.rank();
gp: [r,L1r] = ellanalyticrank(E); L1r/r!
magma: Lr1 where r,Lr1 := AnalyticRank(E: Precision:=12);
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BSD formula
$\displaystyle 4.877176994 \approx L^{(2)}(E,1)/2! \overset{?}{=} \frac{\# Ш(E/\Q)\cdot \Omega_E \cdot \mathrm{Reg}(E/\Q) \cdot \prod_p c_p}{\#E(\Q)_{\rm tor}^2} \approx \frac{1 \cdot 0.948666 \cdot 1.285272 \cdot 4}{1^2} \approx 4.877176994$
Modular invariants
Modular form 16562.2.a.l
For more coefficients, see the Downloads section to the right.
Modular degree: | 3456 | comment: Modular degree
sage: E.modular_degree()
gp: ellmoddegree(E)
magma: ModularDegree(E);
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$ \Gamma_0(N) $-optimal: | yes | |
Manin constant: | 1 | comment: Manin constant
magma: ManinConstant(E);
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Local data
This elliptic curve is not semistable. There are 3 primes of bad reduction:
prime | Tamagawa number | Kodaira symbol | Reduction type | Root number | ord($N$) | ord($\Delta$) | ord$(j)_{-}$ |
---|---|---|---|---|---|---|---|
$2$ | $2$ | $I_{2}$ | Non-split multiplicative | 1 | 1 | 2 | 2 |
$7$ | $2$ | $I_0^{*}$ | Additive | -1 | 2 | 6 | 0 |
$13$ | $1$ | $II$ | Additive | 1 | 2 | 2 | 0 |
Galois representations
The $\ell$-adic Galois representation has maximal image for all primes $\ell$ except those listed in the table below.
prime $\ell$ | mod-$\ell$ image | $\ell$-adic image |
---|---|---|
$2$ | 2G | 4.8.0.2 |
$7$ | 7B | 7.8.0.1 |
The image $H:=\rho_E(\Gal(\overline{\Q}/\Q))$ of the adelic Galois representation has level \( 364 = 2^{2} \cdot 7 \cdot 13 \), index $768$, genus $21$, and generators
$\left(\begin{array}{rr} 57 & 77 \\ 329 & 106 \end{array}\right),\left(\begin{array}{rr} 363 & 336 \\ 0 & 207 \end{array}\right),\left(\begin{array}{rr} 19 & 28 \\ 280 & 59 \end{array}\right),\left(\begin{array}{rr} 1 & 0 \\ 196 & 1 \end{array}\right),\left(\begin{array}{rr} 15 & 7 \\ 336 & 169 \end{array}\right),\left(\begin{array}{rr} 169 & 168 \\ 196 & 169 \end{array}\right),\left(\begin{array}{rr} 1 & 208 \\ 336 & 1 \end{array}\right),\left(\begin{array}{rr} 197 & 0 \\ 0 & 85 \end{array}\right)$.
The torsion field $K:=\Q(E[364])$ is a degree-$6604416$ Galois extension of $\Q$ with $\Gal(K/\Q)$ isomorphic to the projection of $H$ to $\GL_2(\Z/364\Z)$.
Isogenies
This curve has non-trivial cyclic isogenies of degree $d$ for $d=$
7.
Its isogeny class 16562d
consists of 2 curves linked by isogenies of
degree 7.
Twists
The minimal quadratic twist of this elliptic curve is 338a1, its twist by $-7$.
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 $E(\Q)_{\rm tors}$ (which is trivial) are as follows:
$[K:\Q]$ | $K$ | $E(K)_{\rm tors}$ | Base change curve |
---|---|---|---|
$3$ | 3.1.676.1 | \(\Z/2\Z\) | Not in database |
$6$ | 6.0.1827904.2 | \(\Z/2\Z \oplus \Z/2\Z\) | Not in database |
$6$ | 6.2.8150623936.2 | \(\Z/4\Z\) | Not in database |
$6$ | 6.0.2037655984.2 | \(\Z/4\Z\) | Not in database |
$6$ | 6.0.127353499.1 | \(\Z/7\Z\) | Not in database |
$8$ | 8.2.405528180967728.1 | \(\Z/3\Z\) | Not in database |
$12$ | deg 12 | \(\Z/4\Z \oplus \Z/4\Z\) | Not in database |
$18$ | 18.0.8460433041959583212791803904.2 | \(\Z/28\Z\) | Not in database |
We only show fields where the torsion growth is primitive. For fields not in the database, click on the degree shown to reveal the defining polynomial.
Iwasawa invariants
$p$ | 2 | 3 | 5 | 7 | 11 | 13 | 17 | 19 | 23 | 29 | 31 | 37 | 41 | 43 | 47 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Reduction type | nonsplit | ss | ord | add | ord | add | ord | ss | ord | ord | ord | ord | ord | ord | ord |
$\lambda$-invariant(s) | 10 | 4,6 | 2 | - | 2 | - | 2 | 2,2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
$\mu$-invariant(s) | 0 | 0,0 | 0 | - | 0 | - | 0 | 0,0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
An entry - indicates that the invariants are not computed because the reduction is additive.
$p$-adic regulators
Note: $p$-adic regulator data only exists for primes $p\ge 5$ of good ordinary reduction.