|Bill Allombert on Sat, 01 Feb 2014 20:44:19 +0100|
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|Re: Your help needed|
On Thu, Jan 30, 2014 at 07:46:36AM +0900, Kaz Kobara wrote: > Dear Bill and all, > > > Not unless you know the factorisation of the order of the elliptic curve, > > or some similar useful information > > Thank you for this information. > > That's why the manual of ellorder() > http://pari.math.u-bordeaux.fr/dochtml/html/Functions_related_to_elliptic_cu > rves.html > suggests to supply o of > > ? N = p+1-ellap(E,p); o = [N, factor(N)]; > > This solved our problem. Thank you very much. By curiosity, how did you compute factor(N) ? Cheers, Bill.