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Showing 1 to 1 of 1 for “"farey symbol"”.
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Algorithms related to subgroups of the modular group
… modular group PSL_2{Z}. We use the concept of Farey symbol to describe the subgroups of PSL_2{Z}. The first part contains results concerning the geometry of subgroups of PSL_2{Z}. The second part describes a graph-theoretical approach to finding all subgroups of a given index. In the third part …