On 30 May 2014 15:57, Peter Mueller <ypf...@googlemail.com> wrote: > The lines > > sage: k.<n> = FunctionField(QQ) > sage: R.<X> = k[] > sage: l.<x> = k.extension(X^3+n-1) > sage: E = EllipticCurve(l,[0,n]) > sage: print 1 == x^3+n > True > > show that the point (x,1) lies on the elliptic curve E, which is defined > over l too. > However, E(x,1) fails with an intimidating traceback, with the last line > being > > AttributeError: 'FunctionField_polymod_with_category' object has no > attribute 'parent' > > Am I doing something wrong, or is there a bug in a very basic function?
You are not doing anything wrong, but I would call it more of a NotImplementedError than a bug. We don't have good support for function fields yet, or for elliptic curves over function fields. But still, that error message is bad. While typing I see that Nils has also answered, probably more usefully than me! John Cremona > > -- Peter Mueller > > > -- > You received this message because you are subscribed to the Google Groups > "sage-support" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-support+unsubscr...@googlegroups.com. > To post to this group, send email to sage-support@googlegroups.com. > Visit this group at http://groups.google.com/group/sage-support. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
