Bulletin of the London Mathematical Society Advance Access originally published online on July 14, 2009
Bulletin of the London Mathematical Society 2009 41(4):589-598; doi:10.1112/blms/bdp061
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© 2009 London Mathematical Society
On modular forms for some noncongruence subgroups of SL2(
) II
Department of Mathematics
Iowa State University
Ames, IA 50011
USA
kurthc@iastate.edu
Received 5 September 2008. Revision received 13 March 2009.
In this paper we show every type I(A) noncongruence character group of
0(M) with M square-free satisfies the so-called unbounded denominator property.
2000 Mathematics Subject Classification 11F11.
The authors were supported in part by the NSA grant #H98230-08-1-0076.