|Bill Allombert on Fri, 08 Jun 2012 22:44:48 +0200|
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|Re: ell from j|
On Fri, Jun 08, 2012 at 09:04:57PM +0100, John Cremona wrote: > I wrote a similar function for Sage, called EllipticCurve_from_j, but > it is not normally called directly, rather one does EllipticCurve > (j=...). Can gp use named parameters, so you could do ellinit(j=...)? No, that would just set j to the value and call ellinit(j). > The Sage function has special cases for characteristics 2 and 3, and > also over Q it gives a minimal quadratic twist. You are welcome to > reuse that code :) Where is it ? Cheers, Bill.