Normal congruence subgroups of the 𝑡×𝑡 modular group

Newman, M.

doi:10.1090/S0002-9904-1963-11000-9

Bulletin of the American Mathematical Society

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ISSN 1088-9485 (online) ISSN 0273-0979 (print)

The 2020 MCQ for Bulletin of the American Mathematical Society is 0.84.

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Normal congruence subgroups of the $t \times t$ modular group
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Bull. Amer. Math. Soc. 69 (1963), 719-720

References

Leonard Eugene Dickson, Linear groups: With an exposition of the Galois field theory, Dover Publications, Inc., New York, 1958. With an introduction by W. Magnus. MR 0104735
L. K. Hua and I. Reiner, Automorphisms of the unimodular group, Trans. Amer. Math. Soc. 71 (1951), 331–348. MR 43847, DOI 10.1090/S0002-9947-1951-0043847-X
Morris Newman, Normal congruence subgroups of the modular group, Amer. J. Math. 85 (1963), 419-427; errata, ibid. 85 (1963), 753; 86 (1963), 465. MR 0162863, DOI 10.2307/2373177

Additional Information

Journal: Bull. Amer. Math. Soc. 69 (1963), 719-720
DOI: https://doi.org/10.1090/S0002-9904-1963-11000-9
MathSciNet review: 0152580