Congruence subgroups of Hecke groups and regular dessins
In this thesis we deal with dessins, that is tessellations of orientable surfaces, or from another point of view, two-cell embeddings of graphs on orientable surfaces. Our approach uses the connections of dessins with the Hecke groups Hq, and emphasizes the number-theoretic aspects of these connecti...
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University of Southampton
1998
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| Online Access: | https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264724 |