# Properties

 Label 37.a1 Conductor $37$ Discriminant $37$ j-invariant $\frac{110592}{37}$ CM no Rank $1$ Torsion Structure $\mathrm{Trivial}$

# Related objects

Show commands for: Magma / SageMath / Pari/GP

## Minimal Weierstrass equation

magma: E := EllipticCurve([0, 0, 1, -1, 0]); // or
magma: E := EllipticCurve("37a1");
sage: E = EllipticCurve([0, 0, 1, -1, 0]) # or
sage: E = EllipticCurve("37a1")
gp: E = ellinit([0, 0, 1, -1, 0]) \\ or
gp: E = ellinit("37a1")

$y^2 + y = x^{3} - x$

## Mordell-Weil group structure

$\Z$

### Infinite order Mordell-Weil generator and height

magma: Generators(E);
sage: E.gens()

 $P$ = $\left(0, 0\right)$ $\hat{h}(P)$ ≈ 0.05111140824

## Integral points

magma: IntegralPoints(E);
sage: E.integral_points()

$\left(-1, 0\right)$, $\left(0, 0\right)$, $\left(1, 0\right)$, $\left(2, 2\right)$, $\left(6, 14\right)$

Note: only one of each pair $\pm P$ is listed.

## Invariants

 magma: Conductor(E); sage: E.conductor().factor() gp: ellglobalred(E)[1] $N$ = $37$ = $37$ magma: Discriminant(E); sage: E.discriminant().factor() gp: E.disc $\Delta$ = $37$ = $37$ magma: jInvariant(E); sage: E.j_invariant().factor() gp: E.j $j$ = $\frac{110592}{37}$ = $2^{12} \cdot 3^{3} \cdot 37^{-1}$ $\text{End} (E)$ = $\Z$ (no Complex Multiplication) $\text{ST} (E)$ = $\mathrm{SU}(2)$

## BSD invariants

 magma: Rank(E); sage: E.rank() $r$ = $1$ magma: Regulator(E); sage: E.regulator() $\text{Reg}$ ≈ $0.05111140824$ magma: RealPeriod(E); sage: E.period_lattice().omega() gp: E.omega[1] $\Omega$ ≈ $5.98691729246$ magma: TamagawaNumbers(E); sage: E.tamagawa_numbers() gp: gr=ellglobalred(E); [[gr[4][i,1],gr[5][i][4]] | i<-[1..#gr[4][,1]]] $\prod_p c_p$ = $1$  = $1$ magma: Order(TorsionSubgroup(E)); sage: E.torsion_order() gp: elltors(E)[1] $\#E_{\text{tor}}$ = $1$ magma: MordellWeilShaInformation(E); sage: E.sha().an_numerical() Ш$_{\text{an}}$ = $1$ (exact)

## Modular invariants

### Modular form37.2.1.a

magma: ModularForm(E);
sage: E.q_eigenform(20)
gp: xy = elltaniyama(E);
gp: x*deriv(xy[1])/(2*xy[2]+E.a1*xy[1]+E.a3)

$q - 2q^{2} - 3q^{3} + 2q^{4} - 2q^{5} + 6q^{6} - q^{7} + 6q^{9} + 4q^{10} - 5q^{11} - 6q^{12} - 2q^{13} + 2q^{14} + 6q^{15} - 4q^{16} - 12q^{18} + O(q^{20})$

### Modular degree and optimality

magma: ModularDegree(E);
sage: E.modular_degree()
2 : curve is $\Gamma_0(N)$-optimal

### Special L-value attached to the curve

magma: Lr1 where r,Lr1 := AnalyticRank(E: Precision:=12);
sage: r = E.rank();
sage: E.lseries().dokchitser().derivative(1,r)/r.factorial()
gp: ar = ellanalyticrank(E);
gp: ar[2]/factorial(ar[1])

$L'(E,1)$ ≈ $0.305999773834$

## Local data

magma: [LocalInformation(E,p) : p in BadPrimes(E)];
sage: E.local_data()
gp: ellglobalred(E)[5]
prime Tamagawa number Kodaira symbol Reduction type Root number ord($N$) ord($\Delta$) ord$(j)_{-}$
$37$ $1$ $I_{1}$ Non-split multiplicative 1 1 1 1

## Galois representations

The 2-adic representation attached to this elliptic curve is surjective.

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

The mod $p$ Galois representation has maximal image $\GL(2,\F_p)$ for all primes $p$ .

## $p$-adic data

### $p$-adic regulators

sage: [E.padic_regulator(p) for p in primes(3,20) if E.conductor().valuation(p)<2]

Note: $p$-adic regulator data only exists for primes $p\ge5$ 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 ss ss ordinary ordinary ordinary ordinary ss ss ordinary ordinary ordinary nonsplit ordinary ordinary ordinary 2,1 1,5 1 1 1 3 1,3 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 0 0 0

## Isogenies

This curve has no rational isogenies. Its isogeny class 37.a consists of this curve only.

## Growth of torsion in number fields

The number fields $K$ of degree up to 7 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 3.3.148.1 $\Z/2\Z$ Not in database
6 6.6.810448.1 $\Z/2\Z \times \Z/2\Z$ Not in database

We only show fields where the torsion growth is primitive. For each field $K$ we either show its label, or a defining polynomial when $K$ is not in the database.