Properties

 Label 2.0.7.1-10404.2-a2 Base field $$\Q(\sqrt{-7})$$ Conductor norm $$10404$$ CM no Base change yes Q-curve yes Torsion order $$2$$ Rank $$1$$

Related objects

Show commands: Magma / PariGP / SageMath

Base field$$\Q(\sqrt{-7})$$

Generator $$a$$, with minimal polynomial $$x^{2} - x + 2$$; class number $$1$$.

sage: R.<x> = PolynomialRing(QQ); K.<a> = NumberField(R([2, -1, 1]))

gp: K = nfinit(Polrev([2, -1, 1]));

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![2, -1, 1]);

Weierstrass equation

$${y}^2+{x}{y}={x}^{3}+{x}^{2}-2{x}$$
sage: E = EllipticCurve([K([1,0]),K([1,0]),K([0,0]),K([-2,0]),K([0,0])])

gp: E = ellinit([Polrev([1,0]),Polrev([1,0]),Polrev([0,0]),Polrev([-2,0]),Polrev([0,0])], K);

magma: E := EllipticCurve([K![1,0],K![1,0],K![0,0],K![-2,0],K![0,0]]);

This is a global minimal model.

sage: E.is_global_minimal_model()

Invariants

 Conductor: $$(102)$$ = $$(a)\cdot(-a+1)\cdot(3)\cdot(17)$$ sage: E.conductor()  gp: ellglobalred(E)[1]  magma: Conductor(E); Conductor norm: $$10404$$ = $$2\cdot2\cdot9\cdot289$$ sage: E.conductor().norm()  gp: idealnorm(ellglobalred(E)[1])  magma: Norm(Conductor(E)); Discriminant: $$(612)$$ = $$(a)^{2}\cdot(-a+1)^{2}\cdot(3)^{2}\cdot(17)$$ sage: E.discriminant()  gp: E.disc  magma: Discriminant(E); Discriminant norm: $$374544$$ = $$2^{2}\cdot2^{2}\cdot9^{2}\cdot289$$ sage: E.discriminant().norm()  gp: norm(E.disc)  magma: Norm(Discriminant(E)); j-invariant: $$\frac{1771561}{612}$$ sage: E.j_invariant()  gp: E.j  magma: jInvariant(E); Endomorphism ring: $$\Z$$ Geometric endomorphism ring: $$\Z$$ (no potential complex multiplication) sage: E.has_cm(), E.cm_discriminant()  magma: HasComplexMultiplication(E); Sato-Tate group: $\mathrm{SU}(2)$

Mordell-Weil group

 Rank: $$1$$ Generator $\left(2 : 2 : 1\right)$ Height $$0.14325389294088007147627441303182771997$$ Torsion structure: $$\Z/2\Z$$ sage: T = E.torsion_subgroup(); T.invariants()  gp: T = elltors(E); T[2]  magma: T,piT := TorsionSubgroup(E); Invariants(T); Torsion generator: $\left(0 : 0 : 1\right)$ sage: T.gens()  gp: T[3]  magma: [piT(P) : P in Generators(T)];

BSD invariants

 Analytic rank: $$1$$ sage: E.rank()  magma: Rank(E); Mordell-Weil rank: $$1$$ Regulator: $$0.14325389294088007147627441303182771997$$ Period: $$4.6046026582753952593756186044457011424$$ Tamagawa product: $$8$$  =  $$2\cdot2\cdot2\cdot1$$ Torsion order: $$2$$ Leading coefficient: $$1.9945253463099104124252419311765476026$$ Analytic order of Ш: $$1$$ (rounded)

Local data at primes of bad reduction

sage: E.local_data()

magma: LocalInformation(E);

prime Norm Tamagawa number Kodaira symbol Reduction type Root number ord($$\mathfrak{N}$$) ord($$\mathfrak{D}$$) ord$$(j)_{-}$$
$$(a)$$ $$2$$ $$2$$ $$I_{2}$$ Non-split multiplicative $$1$$ $$1$$ $$2$$ $$2$$
$$(-a+1)$$ $$2$$ $$2$$ $$I_{2}$$ Non-split multiplicative $$1$$ $$1$$ $$2$$ $$2$$
$$(3)$$ $$9$$ $$2$$ $$I_{2}$$ Split multiplicative $$-1$$ $$1$$ $$2$$ $$2$$
$$(17)$$ $$289$$ $$1$$ $$I_{1}$$ Split multiplicative $$-1$$ $$1$$ $$1$$ $$1$$

Galois Representations

The mod $$p$$ Galois Representation has maximal image for all primes $$p < 1000$$ except those listed.

prime Image of Galois Representation
$$2$$ 2B

Isogenies and isogeny class

This curve has non-trivial cyclic isogenies of degree $$d$$ for $$d=$$ 2.
Its isogeny class 10404.2-a consists of curves linked by isogenies of degree 2.

Base change

This elliptic curve is a $$\Q$$-curve. It is the base change of the following 2 elliptic curves:

Base field Curve
$$\Q$$ 102.a1
$$\Q$$ 4998.x1