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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