On Tue, May 20, 2008 at 6:02 PM, Dan Shumow <[EMAIL PROTECTED]> wrote:
>
> Ok, what I really want to do is determine if there is a torsion point
> of order q (a prime) on an elliptic curve over a number field.
>
> Is there a better way to do this in sage besides looking for roots of
> the qth divi
Ok, what I really want to do is determine if there is a torsion point
of order q (a prime) on an elliptic curve over a number field.
Is there a better way to do this in sage besides looking for roots of
the qth division polynomial?
Thanks,
Dan
On May 19, 6:32 pm, "William Stein" <[EMAIL PROTEC
I thought it would be cool to see a vector field plot with the real
and imaginary parts, but for some reason it doesn't work. Anyone know
why not?
i=CDF.0
tau=i
Om=pari([1,tau])
var('x,y')
def g(a,b):
q = CDF(Om.ellwp(a+b*i))
return (float(q.real()),float(q.imag()))
plot_vector_field(g(x
If you force a cast to real type like RDF it works, for example:
sage: def f(a,b): return RDF(abs(Om.ellwp(a+b*i)))
instead of what you have. This may not be the optimal solution but it
works.
-M. Hampton
On May 20, 1:19 am, Kai <[EMAIL PROTECTED]> wrote:
> Hi there,
> i'm having yet another
