Abstract
This paper gives a short geometric algorithm for deciding the discreteness of most 2-generator subgroups of PSL(2,R), as well as a self-contained algorithmic approach to the complete classification.
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Partially supported by NSF Grant No. MCS-7801248
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Matelski, J.P. The classification of discrete 2-generator subgroups of PSL(2,R). Israel J. Math. 42, 309–317 (1982). https://doi.org/10.1007/BF02761412
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DOI: https://doi.org/10.1007/BF02761412