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A034257
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Maximal discrete supergroups of Gamma_0(n).
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0
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OFFSET
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1,2
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REFERENCES
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J. H. Conway, Understanding groups like Gamma_0(N), in Groups, Difference Sets and the Monster, de Gruyter, (1996), 327-343.
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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