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There Are Only 9 Finite Groups of Fractional Linear Transformations with Integer Coefficients

by Gregory P. Dresden (Washington & Lee University)

This article originally appeared in:
Mathematics Magazine
June, 2004

Subject classification(s): Algebra and Number Theory | Abstract Algebra | Groups | Analysis | Complex Analysis
Applicable Course(s): 4.2 Mod Algebra I & II | 4.19 Complex Variables

The material in the article should be accessible to undergraduates. Some open question are posed.

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