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Normalizers of modular groups. (English) Zbl 0372.20036


MSC:

20H05 Unimodular groups, congruence subgroups (group-theoretic aspects)
15B36 Matrices of integers
30F35 Fuchsian groups and automorphic functions (aspects of compact Riemann surfaces and uniformization)

References:

[1] Lehner, J., Newman, M.: Weierstrass points of ?0(n). Ann. of Math.79, 360-368 (1964) · Zbl 0124.29203 · doi:10.2307/1970550
[2] Mennicke, J.L.: Finite factor groups of the unimodular group. Ann. of Math.81, 31-37 (1965) · Zbl 0135.06504 · doi:10.2307/1970380
[3] Newman, M.: Integral matrices. New York: Academic Press 1972 · Zbl 0254.15009
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