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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