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Torsion-free subgroups of triangle groups

Author: R. D. Feuer
Journal: Proc. Amer. Math. Soc. 30 (1971), 235-240
MSC: Primary 20.65; Secondary 10.00
MathSciNet review: 0283093
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Abstract: Certain torsion-free subgroups of various triangle groups are considered, the proof of their existence, and in some cases their calculation outlined. There is one section which treats certain specific triangle groups, and one which treats the general case.

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Keywords: Reidemeister-Schreier method, discontinuous groups, noneuclidean geometry, Riemann surfaces
Article copyright: © Copyright 1971 American Mathematical Society