Classification of normal subgroups of the modular group
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- by Morris Newman PDF
- Trans. Amer. Math. Soc. 126 (1967), 267-277 Request permission
References
- H. S. M. Coxeter and W. O. J. Moser, Generators and relations for discrete groups, 2nd ed., Ergebnisse der Mathematik und ihrer Grenzgebiete, (N.F.), Band 14, Springer-Verlag, Berlin-Göttingen-New York, 1965. MR 0174618
- I. M. S. Dey, Schreier systems in free products, Proc. Glasgow Math. Assoc. 7 (1965), 61–79 (1965). MR 188279
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- M. I. Knopp and M. Newman, Congruence subgroups of positive genus of the modular group, Illinois J. Math. 9 (1965), 577–583. MR 181675
- 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
- Morris Newman, Free subgroups and normal subgroups of the modular group, Illinois J. Math. 8 (1964), 262–265. MR 159865
Additional Information
- © Copyright 1967 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 126 (1967), 267-277
- MSC: Primary 10.21
- DOI: https://doi.org/10.1090/S0002-9947-1967-0204375-3
- MathSciNet review: 0204375