Note on normal subgroups of the modular group

Greenberg, L.

doi:10.1090/S0002-9939-1966-0199274-4

Proceedings of the American Mathematical Society

Published by the American Mathematical Society since 1950, Proceedings of the American Mathematical Society is devoted to shorter research articles in all areas of pure and applied mathematics.

ISSN 1088-6826 (online) ISSN 0002-9939 (print)

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Note on normal subgroups of the modular group
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by L. Greenberg

Proc. Amer. Math. Soc. 17 (1966), 1195-1198

DOI: https://doi.org/10.1090/S0002-9939-1966-0199274-4

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References

Ralph H. Fox, On Fenchel’s conjecture about $F$-groups, Mat. Tidsskr. B 1952 (1952), 61–65. MR 53937
Marshall Hall Jr., The theory of groups, The Macmillan Company, New York, N.Y., 1959. MR 0103215
Morris Newman, Classification of normal subgroups of the modular group, Trans. Amer. Math. Soc. 126 (1967), 267–277. MR 204375, DOI 10.1090/S0002-9947-1967-0204375-3