Orders of Finite Groups of Matrices

Details Orders of Finite Groups of Matrices Orders of Finite Groups of Matrices

2005-11-08

arxiv.org/abs/math/0511191v1

Mathematics

Group Theory

Scientific paper

We present a new proof of a theorem of Schur's determining the least common multiple of the orders of all finite groups of complex $n \times n$-matrices whose elements have traces in the field of rational numbers. The basic method of proof goes back to Minkowski and proceeds by reduction to the case of finite fields. For the most part, we work over an arbitrary number field rather than the rationals. The first half of the article is expository and is intended to be accessible to graduate students and advanced undergraduates. It gives a self-contained treatment, following Schur, over the field of rational numbers.

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