Also, on al elliptic curve over Q yo ucan use heights to avoid a generic 
discrete log computation.  Here,

sage: Q.height()/P.height()
1.00000000000000

suggests that Q-P (or (Q+P) is torsion, and indeed, 

sage: P-Q
(0 : 0 : 1)
sage: (P-Q).order()
2

John Cremona

On Saturday, May 26, 2012 10:14:07 PM UTC+1, raman wrote:
>
> Hi Dears, 
> I have the elliptic curve Y^2=X^3-36X and P=(-3,9) as the its 
> generator. Q=(12,36) is the other point on this curve. I would like to 
> solve Discrete Logarithm but I do not know. 
> Please tell me how I can find the "n" which nQ=p. 
> Best, 
> Raman 
>

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