Normal subgroups of the modular group which are not congruence subgroups
HTML articles powered by AMS MathViewer
- by Morris Newman PDF
- Proc. Amer. Math. Soc. 16 (1965), 831-832 Request permission
References
- Joseph Lehner, Discontinuous groups and automorphic functions, Mathematical Surveys, No. VIII, American Mathematical Society, Providence, R.I., 1964. MR 0164033
- Morris Newman, A complete description of the normal subgroups of genus one of the modular group, Amer. J. Math. 86 (1964), 17–24. MR 163966, DOI 10.2307/2373033
- Irving Reiner, Normal subgroups of the unimodular group, Illinois J. Math. 2 (1958), 142–144. MR 95881
- Klaus Wohlfahrt, An extension of F. Klein’s level concept, Illinois J. Math. 8 (1964), 529–535. MR 167533
Additional Information
- © Copyright 1965 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 16 (1965), 831-832
- MSC: Primary 10.21
- DOI: https://doi.org/10.1090/S0002-9939-1965-0181618-X
- MathSciNet review: 0181618