Hi
See HeckeTriangleGroup(3).get_FD()
(from sage.modular.modform_hecketriangle.hecke_triangle_groups).
For documentation, also see:
http://www.sagemath.org/doc/reference/modfrm_hecketriangle
Best
Jonas
On Monday, January 26, 2015 at 12:19:53 PM UTC+1, Jeroen Demeyer wrote:
> Hello,
>
> Is there any way in Sage to compute with the action of SL(2,Z) (or
> similar groups) on the upper half plane? The group SL2Z exists in Sage,
> but I couldn't find how to make it act on stuff with the rule
> g(x) = (a*x + b)/(c*x + d).
>
> Another obvious question is how to reduce elements to the usual
> fundamental domain.
>
> Is this functionality simply missing from Sage or am I missing how to do it?
>
> Jeroen.
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