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Properties

Label 438702e1
Conductor $438702$
Discriminant $1.232\times 10^{25}$
j-invariant \( \frac{88662205431445681329212953}{510492729707237376} \)
CM no
Rank $0$
Torsion structure \(\Z/{2}\Z\)

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Show commands: Magma / Oscar / PariGP / SageMath

Minimal Weierstrass equation

Minimal Weierstrass equation

Simplified equation

\(y^2+xy=x^3+x^2-2684743391x-53543801206395\) Copy content Toggle raw display (homogenize, simplify)
\(y^2z+xyz=x^3+x^2z-2684743391xz^2-53543801206395z^3\) Copy content Toggle raw display (dehomogenize, simplify)
\(y^2=x^3-3479427435411x-2498087397674037330\) Copy content Toggle raw display (homogenize, minimize)

comment: Define the curve
 
sage: E = EllipticCurve([1, 1, 0, -2684743391, -53543801206395])
 
gp: E = ellinit([1, 1, 0, -2684743391, -53543801206395])
 
magma: E := EllipticCurve([1, 1, 0, -2684743391, -53543801206395]);
 
oscar: E = elliptic_curve([1, 1, 0, -2684743391, -53543801206395])
 
sage: E.short_weierstrass_model()
 
magma: WeierstrassModel(E);
 
oscar: short_weierstrass_model(E)
 

Mordell-Weil group structure

\(\Z/{2}\Z\)

magma: MordellWeilGroup(E);
 

Torsion generators

\( \left(-29970, 14985\right) \) Copy content Toggle raw display

comment: Torsion subgroup
 
sage: E.torsion_subgroup().gens()
 
gp: elltors(E)
 
magma: TorsionSubgroup(E);
 
oscar: torsion_structure(E)
 

Integral points

\( \left(-29970, 14985\right) \) Copy content Toggle raw display

comment: Integral points
 
sage: E.integral_points()
 
magma: IntegralPoints(E);
 

Invariants

Conductor: \( 438702 \)  =  $2 \cdot 3 \cdot 11 \cdot 17^{2} \cdot 23$
comment: Conductor
 
sage: E.conductor().factor()
 
gp: ellglobalred(E)[1]
 
magma: Conductor(E);
 
oscar: conductor(E)
 
Discriminant: $12322053487306791962578944 $  =  $2^{12} \cdot 3^{9} \cdot 11^{3} \cdot 17^{7} \cdot 23^{4} $
comment: Discriminant
 
sage: E.discriminant().factor()
 
gp: E.disc
 
magma: Discriminant(E);
 
oscar: discriminant(E)
 
j-invariant: \( \frac{88662205431445681329212953}{510492729707237376} \)  =  $2^{-12} \cdot 3^{-9} \cdot 11^{-3} \cdot 17^{-1} \cdot 23^{-4} \cdot 193^{3} \cdot 673^{3} \cdot 3433^{3}$
comment: j-invariant
 
sage: E.j_invariant().factor()
 
gp: E.j
 
magma: jInvariant(E);
 
oscar: j_invariant(E)
 
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: $4.0050730723880937833773467437\dots$
gp: ellheight(E)
 
magma: FaltingsHeight(E);
 
oscar: faltings_height(E)
 
Stable Faltings height: $2.5884664003599857432525794348\dots$
magma: StableFaltingsHeight(E);
 
oscar: stable_faltings_height(E)
 
$abc$ quality: $0.9966546572100022\dots$
Szpiro ratio: $5.907378603732872\dots$

BSD invariants

Analytic rank: $0$
sage: E.analytic_rank()
 
gp: ellanalyticrank(E)
 
magma: AnalyticRank(E);
 
Regulator: $1$
comment: Regulator
 
sage: E.regulator()
 
G = E.gen \\ if available
 
matdet(ellheightmatrix(E,G))
 
magma: Regulator(E);
 
Real period: $0.020973649652687497852823269451\dots$
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: $ 16 $  = $ 2\cdot1\cdot1\cdot2\cdot2^{2} $
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)
 
Torsion order: $2$
comment: Torsion order
 
sage: E.torsion_order()
 
gp: elltors(E)[1]
 
magma: Order(TorsionSubgroup(E));
 
oscar: prod(torsion_structure(E)[1])
 
Analytic order of Ш: $1$ ( exact)
comment: Order of Sha
 
sage: E.sha().an_numerical()
 
magma: MordellWeilShaInformation(E);
 
Special value: $ L(E,1) $ ≈ $ 0.083894598610749991411293077804 $
comment: Special L-value
 
r = E.rank();
 
E.lseries().dokchitser().derivative(1,r)/r.factorial()
 
gp: [r,L1r] = ellanalyticrank(E); L1r/r!
 
magma: Lr1 where r,Lr1 := AnalyticRank(E: Precision:=12);
 

BSD formula

$\displaystyle 0.083894599 \approx L(E,1) = \frac{\# Ш(E/\Q)\cdot \Omega_E \cdot \mathrm{Reg}(E/\Q) \cdot \prod_p c_p}{\#E(\Q)_{\rm tor}^2} \approx \frac{1 \cdot 0.020974 \cdot 1.000000 \cdot 16}{2^2} \approx 0.083894599$

# self-contained SageMath code snippet for the BSD formula (checks rank, computes analytic sha)
 
E = EllipticCurve(%s); r = E.rank(); ar = E.analytic_rank(); assert r == ar;
 
Lr1 = E.lseries().dokchitser().derivative(1,r)/r.factorial(); sha = E.sha().an_numerical();
 
omega = E.period_lattice().omega(); reg = E.regulator(); tam = E.tamagawa_product(); tor = E.torsion_order();
 
assert r == ar; print("analytic sha: " + str(RR(Lr1) * tor^2 / (omega * reg * tam)))
 
/* self-contained Magma code snippet for the BSD formula (checks rank, computes analytic sha) */
 
E := EllipticCurve(%s); r := Rank(E); ar,Lr1 := AnalyticRank(E: Precision := 12); assert r eq ar;
 
sha := MordellWeilShaInformation(E); omega := RealPeriod(E) * (Discriminant(E) gt 0 select 2 else 1);
 
reg := Regulator(E); tam := &*TamagawaNumbers(E); tor := #TorsionSubgroup(E);
 
assert r eq ar; print "analytic sha:", Lr1 * tor^2 / (omega * reg * tam);
 

Modular invariants

Modular form 438702.2.a.e

\( q - q^{2} - q^{3} + q^{4} - 2 q^{5} + q^{6} - q^{8} + q^{9} + 2 q^{10} - q^{11} - q^{12} - 6 q^{13} + 2 q^{15} + q^{16} - q^{18} + O(q^{20}) \) Copy content Toggle raw display

comment: q-expansion of modular form
 
sage: E.q_eigenform(20)
 
\\ actual modular form, use for small N
 
[mf,F] = mffromell(E)
 
Ser(mfcoefs(mf,20),q)
 
\\ or just the series
 
Ser(ellan(E,20),q)*q
 
magma: ModularForm(E);
 

For more coefficients, see the Downloads section to the right.

Modular degree: 292626432
comment: Modular degree
 
sage: E.modular_degree()
 
gp: ellmoddegree(E)
 
magma: ModularDegree(E);
 
$ \Gamma_0(N) $-optimal: not computed* (one of 3 curves in this isogeny class which might be optimal)
Manin constant: 1 (conditional*)
comment: Manin constant
 
magma: ManinConstant(E);
 
* The optimal curve in each isogeny class has not been determined in all cases for conductors over 400000. The Manin constant is correct provided that this curve is optimal.

Local data

This elliptic curve is not semistable. There are 5 primes $p$ of bad reduction:

$p$ Tamagawa number Kodaira symbol Reduction type Root number $v_p(N)$ $v_p(\Delta)$ $v_p(\mathrm{den}(j))$
$2$ $2$ $I_{12}$ nonsplit multiplicative 1 1 12 12
$3$ $1$ $I_{9}$ nonsplit multiplicative 1 1 9 9
$11$ $1$ $I_{3}$ nonsplit multiplicative 1 1 3 3
$17$ $2$ $I_{1}^{*}$ additive 1 2 7 1
$23$ $4$ $I_{4}$ split multiplicative -1 1 4 4

comment: Local data
 
sage: E.local_data()
 
gp: ellglobalred(E)[5]
 
magma: [LocalInformation(E,p) : p in BadPrimes(E)];
 
oscar: [(p,tamagawa_number(E,p), kodaira_symbol(E,p), reduction_type(E,p)) for p in bad_primes(E)]
 

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
$2$ 2B 4.6.0.1

comment: mod p Galois image
 
sage: rho = E.galois_representation(); [rho.image_type(p) for p in rho.non_surjective()]
 
magma: [GaloisRepresentation(E,p): p in PrimesUpTo(20)];
 

gens = [[64523, 64518, 38714, 90323], [103217, 8, 103216, 9], [1, 0, 8, 1], [1, 8, 0, 1], [34412, 1, 68839, 6], [1, 4, 4, 17], [40393, 8, 58348, 33], [75080, 3, 46925, 2], [90329, 90324, 90326, 38711], [36424, 103221, 48571, 103222], [7, 6, 103218, 103219]]
 
GL(2,Integers(103224)).subgroup(gens)
 
Gens := [[64523, 64518, 38714, 90323], [103217, 8, 103216, 9], [1, 0, 8, 1], [1, 8, 0, 1], [34412, 1, 68839, 6], [1, 4, 4, 17], [40393, 8, 58348, 33], [75080, 3, 46925, 2], [90329, 90324, 90326, 38711], [36424, 103221, 48571, 103222], [7, 6, 103218, 103219]];
 
sub<GL(2,Integers(103224))|Gens>;
 

The image $H:=\rho_E(\Gal(\overline{\Q}/\Q))$ of the adelic Galois representation has level \( 103224 = 2^{3} \cdot 3 \cdot 11 \cdot 17 \cdot 23 \), index $48$, genus $0$, and generators

$\left(\begin{array}{rr} 64523 & 64518 \\ 38714 & 90323 \end{array}\right),\left(\begin{array}{rr} 103217 & 8 \\ 103216 & 9 \end{array}\right),\left(\begin{array}{rr} 1 & 0 \\ 8 & 1 \end{array}\right),\left(\begin{array}{rr} 1 & 8 \\ 0 & 1 \end{array}\right),\left(\begin{array}{rr} 34412 & 1 \\ 68839 & 6 \end{array}\right),\left(\begin{array}{rr} 1 & 4 \\ 4 & 17 \end{array}\right),\left(\begin{array}{rr} 40393 & 8 \\ 58348 & 33 \end{array}\right),\left(\begin{array}{rr} 75080 & 3 \\ 46925 & 2 \end{array}\right),\left(\begin{array}{rr} 90329 & 90324 \\ 90326 & 38711 \end{array}\right),\left(\begin{array}{rr} 36424 & 103221 \\ 48571 & 103222 \end{array}\right),\left(\begin{array}{rr} 7 & 6 \\ 103218 & 103219 \end{array}\right)$.

Input positive integer $m$ to see the generators of the reduction of $H$ to $\mathrm{GL}_2(\Z/m\Z)$:

The torsion field $K:=\Q(E[103224])$ is a degree-$424337074657689600$ Galois extension of $\Q$ with $\Gal(K/\Q)$ isomorphic to the projection of $H$ to $\GL_2(\Z/103224\Z)$.

The table below list all primes $\ell$ for which the Serre invariants associated to the mod-$\ell$ Galois representation are exceptional.

$\ell$ Reduction type Serre weight Serre conductor
$2$ nonsplit multiplicative $4$ \( 9537 = 3 \cdot 11 \cdot 17^{2} \)
$3$ nonsplit multiplicative $4$ \( 6647 = 17^{2} \cdot 23 \)
$11$ nonsplit multiplicative $12$ \( 39882 = 2 \cdot 3 \cdot 17^{2} \cdot 23 \)
$17$ additive $162$ \( 1518 = 2 \cdot 3 \cdot 11 \cdot 23 \)
$23$ split multiplicative $24$ \( 19074 = 2 \cdot 3 \cdot 11 \cdot 17^{2} \)

Isogenies

gp: ellisomat(E)
 

This curve has non-trivial cyclic isogenies of degree $d$ for $d=$ 2 and 4.
Its isogeny class 438702e consists of 4 curves linked by isogenies of degrees dividing 4.

Twists

The minimal quadratic twist of this elliptic curve is 25806g1, its twist by $17$.

Iwasawa invariants

No Iwasawa invariant data is available for this curve.

$p$-adic regulators

All $p$-adic regulators are identically $1$ since the rank is $0$.