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Normal subgroups of the modular group which are not congruence subgroups

Author: Morris Newman
Journal: Proc. Amer. Math. Soc. 16 (1965), 831-832
MSC: Primary 10.21
MathSciNet review: 0181618
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References [Enhancements On Off] (What's this?)

  • [1] J. Lehner, Discontinuous groups and automorphic functions, Math. Surveys No. 8, Amer. Math. Soc., Providence, R.I., 1964. MR 0164033 (29:1332)
  • [2] M. Newman, A complete description of the normal subgroups of genus one of the modular group, Amer. J. Math. 86 (1964), 17-24. MR 0163966 (29:1265)
  • [3] I. Reiner, Normal subgroups of the unimodular group, Illinois J. Math. 2 (1958), 142-144. MR 0095881 (20:2379)
  • [4] K. Wohlfahrt, An extension of F. Klein's level concept, Illinois J. Math. 8 (1964), 529-535. MR 0167533 (29:4805)

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