# Properties

 Label 2.0.4.1-5625.3-c1 Base field $$\Q(\sqrt{-1})$$ Conductor $$(75)$$ Conductor norm $$5625$$ CM no Base change yes: 75.c1,1200.p1 Q-curve yes Torsion order $$1$$ Rank $$0$$

# Related objects

Show commands: Magma / Pari/GP / SageMath

## Base field$$\Q(\sqrt{-1})$$

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

sage: R.<x> = PolynomialRing(QQ); K.<a> = NumberField(R([1, 0, 1]))

gp: K = nfinit(Pol(Vecrev([1, 0, 1])));

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![1, 0, 1]);

## Weierstrass equation

$${y}^2+{y}={x}^{3}-{x}^{2}-8{x}-7$$
sage: E = EllipticCurve([K([0,0]),K([-1,0]),K([1,0]),K([-8,0]),K([-7,0])])

gp: E = ellinit([Pol(Vecrev([0,0])),Pol(Vecrev([-1,0])),Pol(Vecrev([1,0])),Pol(Vecrev([-8,0])),Pol(Vecrev([-7,0]))], K);

magma: E := EllipticCurve([K![0,0],K![-1,0],K![1,0],K![-8,0],K![-7,0]]);

This is a global minimal model.

sage: E.is_global_minimal_model()

## Invariants

 Conductor: $$(75)$$ = $$(-i-2)^{2}\cdot(2i+1)^{2}\cdot(3)$$ sage: E.conductor()  gp: ellglobalred(E)[1]  magma: Conductor(E); Conductor norm: $$5625$$ = $$5^{2}\cdot5^{2}\cdot9$$ sage: E.conductor().norm()  gp: idealnorm(ellglobalred(E)[1])  magma: Norm(Conductor(E)); Discriminant: $$(-1875)$$ = $$(-i-2)^{4}\cdot(2i+1)^{4}\cdot(3)$$ sage: E.discriminant()  gp: E.disc  magma: Discriminant(E); Discriminant norm: $$3515625$$ = $$5^{4}\cdot5^{4}\cdot9$$ sage: E.discriminant().norm()  gp: norm(E.disc)  magma: Norm(Discriminant(E)); j-invariant: $$-\frac{102400}{3}$$ 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: $$0$$ Torsion structure: trivial sage: T = E.torsion_subgroup(); T.invariants()  gp: T = elltors(E); T[2]  magma: T,piT := TorsionSubgroup(E); Invariants(T);

## BSD invariants

 Analytic rank: $$0$$ sage: E.rank()  magma: Rank(E); Mordell-Weil rank: $$0$$ Regulator: $$1$$ Period: $$3.27460309111282$$ Tamagawa product: $$1$$  =  $$1\cdot1\cdot1$$ Torsion order: $$1$$ Leading coefficient: $$3.27460309111282$$ 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$$(j)_{-}$$
$$(-i-2)$$ $$5$$ $$1$$ $$IV$$ Additive $$-1$$ $$2$$ $$4$$ $$0$$
$$(2i+1)$$ $$5$$ $$1$$ $$IV$$ Additive $$-1$$ $$2$$ $$4$$ $$0$$
$$(3)$$ $$9$$ $$1$$ $$I_{1}$$ 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
$$5$$ 5B.1.3

## Isogenies and isogeny class

This curve has non-trivial cyclic isogenies of degree $$d$$ for $$d=$$ 5.
Its isogeny class 5625.3-c consists of curves linked by isogenies of degree 5.

## Base change

This curve is the base change of 75.c1, 1200.p1, defined over $$\Q$$, so it is also a $$\Q$$-curve.