# Properties

 Label 2760.k2 Conductor $2760$ Discriminant $-1.842\times 10^{14}$ j-invariant $$-\frac{3552342505518244}{179863605135}$$ CM no Rank $0$ Torsion structure $$\Z/{2}\Z$$

# Related objects

Show commands: Magma / Pari/GP / SageMath

## Simplified equation

 $$y^2=x^3+x^2-32040x+2291328$$ y^2=x^3+x^2-32040x+2291328 (homogenize, simplify) $$y^2z=x^3+x^2z-32040xz^2+2291328z^3$$ y^2z=x^3+x^2z-32040xz^2+2291328z^3 (dehomogenize, simplify) $$y^2=x^3-2595267x+1678163886$$ y^2=x^3-2595267x+1678163886 (homogenize, minimize)

sage: E = EllipticCurve([0, 1, 0, -32040, 2291328])

gp: E = ellinit([0, 1, 0, -32040, 2291328])

magma: E := EllipticCurve([0, 1, 0, -32040, 2291328]);

sage: E.short_weierstrass_model()

magma: WeierstrassModel(E);

## Mordell-Weil group structure

$$\Z/{2}\Z$$

## Torsion generators

sage: E.torsion_subgroup().gens()

gp: elltors(E)

magma: TorsionSubgroup(E);

$$\left(-208, 0\right)$$

## Integral points

sage: E.integral_points()

magma: IntegralPoints(E);

$$\left(-208, 0\right)$$

## Invariants

 sage: E.conductor().factor()  gp: ellglobalred(E)[1]  magma: Conductor(E); Conductor: $$2760$$ = $2^{3} \cdot 3 \cdot 5 \cdot 23$ sage: E.discriminant().factor()  gp: E.disc  magma: Discriminant(E); Discriminant: $-184180331658240$ = $-1 \cdot 2^{10} \cdot 3^{5} \cdot 5 \cdot 23^{6}$ sage: E.j_invariant().factor()  gp: E.j  magma: jInvariant(E); j-invariant: $$-\frac{3552342505518244}{179863605135}$$ = $-1 \cdot 2^{2} \cdot 3^{-5} \cdot 5^{-1} \cdot 19^{3} \cdot 23^{-6} \cdot 5059^{3}$ Endomorphism ring: $\Z$ Geometric endomorphism ring: $$\Z$$ (no potential complex multiplication) Sato-Tate group: $\mathrm{SU}(2)$ Faltings height: $1.4978435844512900730916331220\dots$ Stable Faltings height: $0.92022093398466898191060635412\dots$

## BSD invariants

 sage: E.rank()  magma: Rank(E); Analytic rank: $0$ sage: E.regulator()  magma: Regulator(E); Regulator: $1$ 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); Real period: $0.56215139146311533913789999232\dots$ sage: E.tamagawa_numbers()  gp: gr=ellglobalred(E); [[gr[4][i,1],gr[5][i][4]] | i<-[1..#gr[4][,1]]]  magma: TamagawaNumbers(E); Tamagawa product: $20$  = $2\cdot5\cdot1\cdot2$ sage: E.torsion_order()  gp: elltors(E)[1]  magma: Order(TorsionSubgroup(E)); Torsion order: $2$ sage: E.sha().an_numerical()  magma: MordellWeilShaInformation(E); Analytic order of Ш: $1$ (exact) sage: r = E.rank(); sage: E.lseries().dokchitser().derivative(1,r)/r.factorial()  gp: ar = ellanalyticrank(E); gp: ar[2]/factorial(ar[1])  magma: Lr1 where r,Lr1 := AnalyticRank(E: Precision:=12); Special value: $L(E,1)$ ≈ $2.8107569573155766956894999616$

## Modular invariants

sage: E.q_eigenform(20)

gp: xy = elltaniyama(E);

gp: x*deriv(xy[1])/(2*xy[2]+E.a1*xy[1]+E.a3)

magma: ModularForm(E);

$$q + q^{3} + q^{5} + q^{9} + 2 q^{11} + q^{15} + 6 q^{17} + 8 q^{19} + O(q^{20})$$

 sage: E.modular_degree()  magma: ModularDegree(E); Modular degree: 10560 $\Gamma_0(N)$-optimal: yes Manin constant: 1

## Local data

This elliptic curve is not semistable. There are 4 primes of bad reduction:

sage: E.local_data()

gp: ellglobalred(E)[5]

magma: [LocalInformation(E,p) : p in BadPrimes(E)];

prime Tamagawa number Kodaira symbol Reduction type Root number ord($N$) ord($\Delta$) ord$(j)_{-}$
$2$ $2$ $III^{*}$ Additive -1 3 10 0
$3$ $5$ $I_{5}$ Split multiplicative -1 1 5 5
$5$ $1$ $I_{1}$ Split multiplicative -1 1 1 1
$23$ $2$ $I_{6}$ Non-split multiplicative 1 1 6 6

## Galois representations

sage: rho = E.galois_representation();

sage: [rho.image_type(p) for p in rho.non_surjective()]

magma: [GaloisRepresentation(E,p): p in PrimesUpTo(20)];

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 2.3.0.1
sage: gens = [[1, 0, 4, 1], [2757, 4, 2756, 5], [922, 1, 919, 0], [3, 4, 8, 11], [1, 2, 2, 5], [1, 4, 0, 1], [1381, 4, 2, 9], [1201, 4, 2402, 9], [554, 1, 1103, 0], [1729, 1036, 344, 2415]]

sage: GL(2,Integers(2760)).subgroup(gens)

magma: Gens := [[1, 0, 4, 1], [2757, 4, 2756, 5], [922, 1, 919, 0], [3, 4, 8, 11], [1, 2, 2, 5], [1, 4, 0, 1], [1381, 4, 2, 9], [1201, 4, 2402, 9], [554, 1, 1103, 0], [1729, 1036, 344, 2415]];

magma: sub<GL(2,Integers(2760))|Gens>;

The image of the adelic Galois representation has level $2760$, index $12$, genus $0$, and generators

$\left(\begin{array}{rr} 1 & 0 \\ 4 & 1 \end{array}\right),\left(\begin{array}{rr} 2757 & 4 \\ 2756 & 5 \end{array}\right),\left(\begin{array}{rr} 922 & 1 \\ 919 & 0 \end{array}\right),\left(\begin{array}{rr} 3 & 4 \\ 8 & 11 \end{array}\right),\left(\begin{array}{rr} 1 & 2 \\ 2 & 5 \end{array}\right),\left(\begin{array}{rr} 1 & 4 \\ 0 & 1 \end{array}\right),\left(\begin{array}{rr} 1381 & 4 \\ 2 & 9 \end{array}\right),\left(\begin{array}{rr} 1201 & 4 \\ 2402 & 9 \end{array}\right),\left(\begin{array}{rr} 554 & 1 \\ 1103 & 0 \end{array}\right),\left(\begin{array}{rr} 1729 & 1036 \\ 344 & 2415 \end{array}\right)$

## $p$-adic regulators

sage: [E.padic_regulator(p) for p in primes(5,20) if E.conductor().valuation(p)<2]

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

## Iwasawa invariants

$p$ Reduction type $\lambda$-invariant(s) $\mu$-invariant(s) 2 3 5 23 add split split nonsplit - 3 3 0 - 0 0 0

All Iwasawa $\lambda$ and $\mu$-invariants for primes $p\ge 7$ 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.
Its isogeny class 2760.k consists of 2 curves linked by isogenies of degree 2.

## 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 $E(\Q)_{\rm tors}$ $\cong \Z/{2}\Z$ are as follows:

 $[K:\Q]$ $E(K)_{\rm tors}$ Base change curve $K$ $2$ $$\Q(\sqrt{-15})$$ $$\Z/2\Z \oplus \Z/2\Z$$ Not in database $4$ 4.2.507840.4 $$\Z/4\Z$$ Not in database $8$ 8.0.58027829760000.7 $$\Z/2\Z \oplus \Z/4\Z$$ Not in database $8$ 8.0.6170256000000.25 $$\Z/2\Z \oplus \Z/4\Z$$ Not in database $8$ 8.2.113374080000.2 $$\Z/6\Z$$ Not in database $16$ deg 16 $$\Z/8\Z$$ Not in database $16$ deg 16 $$\Z/2\Z \oplus \Z/6\Z$$ 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.