An error!!

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

An error!!

To: "pari-users@pari.math.u-bordeaux1.fr" <pari-users@pari.math.u-bordeaux1.fr>
Subject: An error!!
From: somayeh didari <somayeh_didari@yahoo.com>
Date: Fri, 19 Oct 2012 11:01:18 -0700 (PDT)
Delivery-date: Fri, 19 Oct 2012 20:01:27 +0200
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1350669678; bh=8f031qOS7C+aoJ4e12RYaFz8lWpdJQg1YNNjnPlKb4Q=; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type; b=Lf6e756WrUrodLrDfc8KP9DuLmBhes7hck7G2GYkURbzF67z00tyLm7pArHCObHy/LBjgdrSNzPzEuZprNiEaaDpZvnFwIBUngw9UuYn6je+Ln96TI6VLF9bCmltPVWqsTBOsAyacp+sarsy5Zb9QJo+aKR7c9toUxR52qeFeRg=
Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type; b=db/W+axED+aOdrTIrnhzJ3m2p1ZAOKRNtC2AyfAYBZyqFHmQ4LnO0/B/ypFDPPHNr4EoCboYQvDf452ymlJTytgXuJg77ImFZJ1tiymqRZqlquXh7waxpLctxELGM/iUyaJyQ1BqCpHlwAFLbkxwnaavhcGTdGsb9YqhnpCsZeE=;
References:
Reply-to: somayeh didari <somayeh_didari@yahoo.com>

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

Follow-Ups:
- Re: An error!!
  - From: Bill Allombert <Bill.Allombert@math.u-bordeaux1.fr>