Helena Verrill
Copenhagen
Fundamental domains for congruence subgroups
Thursday 10th March, 3-4pm
Eastern Avenue Tutorial Room 404
I will give an elementary introduction to
congruence subgroups and their action on the
upper half complex plane, using a java program
to illustrate some of the ideas. I will
briefly discuss some background and motivation.
Then I will talk about the methods used for
computing fundamental domains for this action, in
particular the method of Kulkarni. I will
give a demonstration and illustration of
this method as implemented in magma, and I will
discuss problems for further work and computation.
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