# Properties

 Label 84966.ct4 Conductor $84966$ Discriminant $-1.246\times 10^{19}$ j-invariant $$\frac{103823}{4386816}$$ CM no Rank $1$ Torsion structure $$\Z/{4}\Z$$

# Related objects

Show commands for: Magma / Pari/GP / SageMath

## Minimal Weierstrass equation

sage: E = EllipticCurve([1, 1, 1, 13866, -169807149])

gp: E = ellinit([1, 1, 1, 13866, -169807149])

magma: E := EllipticCurve([1, 1, 1, 13866, -169807149]);

$$y^2+xy+y=x^3+x^2+13866x-169807149$$

## Mordell-Weil group structure

$$\Z\times \Z/{4}\Z$$

### Infinite order Mordell-Weil generator and height

sage: E.gens()

magma: Generators(E);

 $$P$$ = $$\left(1123, 34985\right)$$ $$\hat{h}(P)$$ ≈ $3.2980095209058184688212081091$

## Torsion generators

sage: E.torsion_subgroup().gens()

gp: elltors(E)

magma: TorsionSubgroup(E);

$$\left(1497, 55895\right)$$

## Integral points

sage: E.integral_points()

magma: IntegralPoints(E);

$$\left(545, -273\right)$$, $$\left(1123, 34985\right)$$, $$\left(1123, -36109\right)$$, $$\left(1497, 55895\right)$$, $$\left(1497, -57393\right)$$, $$\left(2113, 95375\right)$$, $$\left(2113, -97489\right)$$, $$\left(58141, 13990319\right)$$, $$\left(58141, -14048461\right)$$

## Invariants

 sage: E.conductor().factor()  gp: ellglobalred(E)[1]  magma: Conductor(E); Conductor: $$84966$$ = $$2 \cdot 3 \cdot 7^{2} \cdot 17^{2}$$ sage: E.discriminant().factor()  gp: E.disc  magma: Discriminant(E); Discriminant: $$-12457508356120375296$$ = $$-1 \cdot 2^{12} \cdot 3^{2} \cdot 7^{7} \cdot 17^{7}$$ sage: E.j_invariant().factor()  gp: E.j  magma: jInvariant(E); j-invariant: $$\frac{103823}{4386816}$$ = $$2^{-12} \cdot 3^{-2} \cdot 7^{-1} \cdot 17^{-1} \cdot 47^{3}$$ Endomorphism ring: $$\Z$$ Geometric endomorphism ring: $$\Z$$ (no potential complex multiplication) Sato-Tate group: $\mathrm{SU}(2)$ Faltings height: $$2.3429644364684814467872837199\dots$$ Stable Faltings height: $$-0.046597310087283245890159960758\dots$$

## BSD invariants

 sage: E.rank()  magma: Rank(E); Analytic rank: $$1$$ sage: E.regulator()  magma: Regulator(E); Regulator: $$3.2980095209058184688212081091\dots$$ sage: E.period_lattice().omega()  gp: E.omega[1]  magma: RealPeriod(E); Real period: $$0.10368384217475700331385070627\dots$$ 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: $$384$$  = $$( 2^{2} \cdot 3 )\cdot2\cdot2^{2}\cdot2^{2}$$ sage: E.torsion_order()  gp: elltors(E)[1]  magma: Order(TorsionSubgroup(E)); Torsion order: $$4$$ sage: E.sha().an_numerical()  magma: MordellWeilShaInformation(E); Analytic order of Ш: $$1$$ (exact)

## Modular invariants

Modular form 84966.2.a.ct

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);

$$q + q^{2} - q^{3} + q^{4} - 2q^{5} - q^{6} + q^{8} + q^{9} - 2q^{10} - q^{12} + 6q^{13} + 2q^{15} + q^{16} + q^{18} + O(q^{20})$$

 sage: E.modular_degree()  magma: ModularDegree(E); Modular degree: 2654208 $$\Gamma_0(N)$$-optimal: yes Manin constant: 1

#### Special L-value

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);

$$L'(E,1)$$ ≈ $$8.2068071677546761546237447869645054846$$

## 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$$(j)_{-}$$
$$2$$ $$12$$ $$I_{12}$$ Split multiplicative -1 1 12 12
$$3$$ $$2$$ $$I_{2}$$ Non-split multiplicative 1 1 2 2
$$7$$ $$4$$ $$I_1^{*}$$ Additive -1 2 7 1
$$17$$ $$4$$ $$I_1^{*}$$ Additive 1 2 7 1

## 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 X34a.

This subgroup is the pull-back of the subgroup of $\GL(2,\Z_2/2^3\Z_2)$ generated by $\left(\begin{array}{rr} 3 & 3 \\ 4 & 5 \end{array}\right),\left(\begin{array}{rr} 1 & 1 \\ 4 & 5 \end{array}\right),\left(\begin{array}{rr} 3 & 3 \\ 0 & 5 \end{array}\right)$ and has index 24.

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 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

## $p$-adic data

### $p$-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 split nonsplit ordinary add ss ordinary add ss ordinary ordinary ordinary ordinary ordinary ordinary ss 11 1 1 - 1,1 1 - 1,1 1 1 1 1 1 1 1,1 0 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 and 4.
Its isogeny class 84966.ct consists of 4 curves linked by isogenies of degrees dividing 4.

## 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 $E(\Q)_{\rm tors}$ $\cong \Z/{4}\Z$ are as follows:

 $[K:\Q]$ $E(K)_{\rm tors}$ Base change curve $K$ $2$ $$\Q(\sqrt{-119})$$ $$\Z/2\Z \times \Z/4\Z$$ Not in database $4$ 4.2.107850176.2 $$\Z/8\Z$$ Not in database $8$ 8.0.11631660463230976.2 $$\Z/2\Z \times \Z/8\Z$$ Not in database $8$ 8.0.66532342173696.5 $$\Z/2\Z \times \Z/8\Z$$ Not in database $8$ 8.0.58885281095106816.10 $$\Z/4\Z \times \Z/4\Z$$ Not in database $8$ Deg 8 $$\Z/12\Z$$ Not in database $16$ Deg 16 $$\Z/16\Z$$ Not in database $16$ Deg 16 $$\Z/2\Z \times \Z/12\Z$$ 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.