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Showing 1 to 1 of 1 for “"trivalent diagram"”.
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Algorithms related to subgroups of the modular group
Classifying subgroups of the modular group PSL_2{Z} is a fundamental problem with applications to modular forms, in addition to its group-theoretic interest. While a lot of research has been done on the congruence subgroups of PSL_2{Z}, very little is known about noncongruence subgroups. The …