Fake Congruence Modular Curves and Subgr
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Gabriel Berger
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Article
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1999
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Elsevier Science
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English
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We construct a special class of noncongruence modular subgroups and curves, analogous in some ways to the usual congruence ones. The subgroups are obtained via the Burau representation, and the associated quotient curves have a natural moduli space interpretation. In fact, they are reduced Hurwitz s