somayeh didari on Fri, 19 Oct 2012 20:01:27 +0200


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An error!!

Hello
As we know (page 256 of joseph. H. Silverman The arithmetic of elliptic curves), f_2(E)<6, but using the following code:

E=ellinint([0,0,0,-15,0])
ellglobalred(E)
we have:
 N=14400
and
factor(14400)
[2 6]
[3 2]
[5 2]
what is the problem?

With all the best
Somayeh Didari