[sage-support] Re: Finding the order of points on elliptic curves

2007-08-03 Thread John Cremona
The original questioner does not say over what field his elliptic curves are defined -- which makes quite a big difference! Over Q this is easy, partly because of Lutz-Nagell, partly because of Mazur. It's harder to apply those (or their generalizations) over number fields, but at least one coul

[sage-support] Re: Finding the order of points on elliptic curves

2007-08-02 Thread William Stein
On 8/2/07, biozan <[EMAIL PROTECTED]> wrote: > > Hi, > > I'm just wondering if there is a command in sage to determine the > order of a point on an elliptic curve or do I have to define such a > function? I've looked through all the tutorials, cookbook, programming > guide etc, but I can't seem to