Tiago Mendes on Tue, 05 Nov 2019 16:15:07 +0100

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Finding Y coordinate

Good afternoon,

I am writing a file in C using the PARI C Library  and need some help. This is what i want to do:

- Given 

—— a prime p,  and

—— the coordinate X  

i want to obtain the value of Y coordinate from the curve Y^2 = X^3 + 7 (mod p) , knowing for example that Y is positive. 

os meus cumprimentos

Tiago Mendes