Maximal normal subgroups of the modular group
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- by Morris Newman
- Proc. Amer. Math. Soc. 19 (1968), 1138-1144
- DOI: https://doi.org/10.1090/S0002-9939-1968-0248233-3
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References
- J. Gierster, Die Untergruppen der Galois’schen Gruppe der Modulargleichungen für den Fall eines primzahligen Transformationsgrades, Math. Ann. 18 (1881), no. 2, 319–365 (German). MR 1510106, DOI 10.1007/BF01445855 A. M. Macbeath, Fuchsian groups, Lectures at Queen’s College, Dundee.
- Morris Newman, Normal subgroups of the modular group which are not congruence subgroups, Proc. Amer. Math. Soc. 16 (1965), 831–832. MR 181618, DOI 10.1090/S0002-9939-1965-0181618-X
- 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
Bibliographic Information
- © Copyright 1968 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 19 (1968), 1138-1144
- MSC: Primary 20.65
- DOI: https://doi.org/10.1090/S0002-9939-1968-0248233-3
- MathSciNet review: 0248233