# Properties

 Label 2800.g5 Conductor $2800$ Discriminant $-1792000000$ j-invariant $$-\frac{15625}{28}$$ CM no Rank $1$ Torsion structure $$\Z/{2}\Z$$

# Related objects

Show commands: Magma / Pari/GP / SageMath

## Minimal Weierstrass equation

sage: E = EllipticCurve([0, 1, 0, -208, -2412])

gp: E = ellinit([0, 1, 0, -208, -2412])

magma: E := EllipticCurve([0, 1, 0, -208, -2412]);

## Simplified equation

 $$y^2=x^3+x^2-208x-2412$$ y^2=x^3+x^2-208x-2412 (homogenize, simplify) $$y^2z=x^3+x^2z-208xz^2-2412z^3$$ y^2z=x^3+x^2z-208xz^2-2412z^3 (dehomogenize, simplify) $$y^2=x^3-16875x-1707750$$ y^2=x^3-16875x-1707750 (homogenize, minimize)

## Mordell-Weil group structure

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

### Infinite order Mordell-Weil generator and height

sage: E.gens()

magma: Generators(E);

 $P$ = $$\left(34, 176\right)$$ (34, 176) $\hat{h}(P)$ ≈ $2.0545412119477143566181317359$

## Torsion generators

sage: E.torsion_subgroup().gens()

gp: elltors(E)

magma: TorsionSubgroup(E);

$$\left(18, 0\right)$$

## Integral points

sage: E.integral_points()

magma: IntegralPoints(E);

$$\left(18, 0\right)$$, $$(34,\pm 176)$$, $$(68,\pm 550)$$

## Invariants

 sage: E.conductor().factor()  gp: ellglobalred(E)[1]  magma: Conductor(E); Conductor: $$2800$$ = $2^{4} \cdot 5^{2} \cdot 7$ sage: E.discriminant().factor()  gp: E.disc  magma: Discriminant(E); Discriminant: $-1792000000$ = $-1 \cdot 2^{14} \cdot 5^{6} \cdot 7$ sage: E.j_invariant().factor()  gp: E.j  magma: jInvariant(E); j-invariant: $$-\frac{15625}{28}$$ = $-1 \cdot 2^{-2} \cdot 5^{6} \cdot 7^{-1}$ Endomorphism ring: $\Z$ Geometric endomorphism ring: $$\Z$$ (no potential complex multiplication) Sato-Tate group: $\mathrm{SU}(2)$ Faltings height: $0.46578123825199760819453284526\dots$ Stable Faltings height: $-1.0320848985249978885230789428\dots$

## BSD invariants

 sage: E.rank()  magma: Rank(E); Analytic rank: $1$ sage: E.regulator()  magma: Regulator(E); Regulator: $2.0545412119477143566181317359\dots$ sage: E.period_lattice().omega()  gp: E.omega[1]  magma: RealPeriod(E); Real period: $0.59277770310210141078525885237\dots$ 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: $8$  = $2^{2}\cdot2\cdot1$ 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: $L'(E,1)$ ≈ $2.4357724410939476573450722698$

## 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);

$$q - 2 q^{3} + q^{7} + q^{9} + 4 q^{13} - 6 q^{17} - 2 q^{19} + O(q^{20})$$

 sage: E.modular_degree()  magma: ModularDegree(E); Modular degree: 1152 $\Gamma_0(N)$-optimal: yes Manin constant: 1

## Local data

This elliptic curve is not semistable. There are 3 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$(j)_{-}$
$2$ $4$ $I_{6}^{*}$ Additive -1 4 14 2
$5$ $2$ $I_0^{*}$ Additive 1 2 6 0
$7$ $1$ $I_{1}$ Split multiplicative -1 1 1 1

## 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 8.6.0.1
$3$ 3B 9.12.0.1

## $p$-adic regulators

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

Note: $p$-adic regulator data only exists for primes $p\ge 5$ of good ordinary reduction.

## Iwasawa invariants

 $p$ Reduction type $\lambda$-invariant(s) $\mu$-invariant(s) 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 add ord add split ss ord ord ord ss ord ord ord ord ord ord - 3 - 2 1,1 1 1 1 1,1 3 1 1 1 1 1 - 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.

## Isogenies

This curve has non-trivial cyclic isogenies of degree $d$ for $d=$ 2, 3, 6, 9 and 18.
Its isogeny class 2800.g consists of 6 curves linked by isogenies of degrees dividing 18.

## 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 $K$ $2$ $$\Q(\sqrt{-7})$$ $$\Z/2\Z \oplus \Z/2\Z$$ Not in database $2$ $$\Q(\sqrt{-5})$$ $$\Z/6\Z$$ Not in database $4$ 4.2.44800.1 $$\Z/4\Z$$ Not in database $4$ $$\Q(\sqrt{-5}, \sqrt{-7})$$ $$\Z/2\Z \oplus \Z/6\Z$$ Not in database $6$ 6.2.2074464000.8 $$\Z/6\Z$$ Not in database $6$ 6.0.19208000.1 $$\Z/18\Z$$ Not in database $8$ 8.0.18823840000.5 $$\Z/2\Z \oplus \Z/4\Z$$ Not in database $8$ 8.0.98344960000.15 $$\Z/2\Z \oplus \Z/4\Z$$ Not in database $8$ 8.0.2007040000.5 $$\Z/12\Z$$ Not in database $12$ Deg 12 $$\Z/3\Z \oplus \Z/6\Z$$ Not in database $12$ Deg 12 $$\Z/18\Z$$ Not in database $12$ Deg 12 $$\Z/2\Z \oplus \Z/6\Z$$ Not in database $12$ 12.0.18078415936000000.3 $$\Z/2\Z \oplus \Z/18\Z$$ Not in database $16$ Deg 16 $$\Z/8\Z$$ Not in database $16$ Deg 16 $$\Z/2\Z \oplus \Z/12\Z$$ Not in database $16$ Deg 16 $$\Z/2\Z \oplus \Z/12\Z$$ 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.