Ok, got it... 
Thanks!

El martes, 20 de junio de 2017, 13:07:17 (UTC+2), vdelecroix escribió:
>
> What is the problem!? "10 = -1 mod 11", no? 
>
> On 20/06/2017 12:52, Xavier Nogues wrote: 
> > Hello, 
> > I dont  know how to define elliptic curve y^2=x^3-x over finite field 
> 11. 
> > The negative  "-x" is the problem 
> > 
> > p=11 
> > E=EllipticCurve(GF(p),[0,0,0,-1,0]); 
> > 
> > 
> > 
> > Elliptic Curve defined by y^2 = x^3 + *10*x* over Finite Field of size 
> 11 
> > 
> > 
> > Thanks 
> > 
> > 
> > 
>

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