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Monochromatic Permutation Quadruples—A Schur Thing in Sn

R. McCutcheon
The American Mathematical Monthly
Vol. 119, No. 4 (April 2012), pp. 342-343
DOI: 10.4169/amer.math.monthly.119.04.342
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Page Count: 2
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Abstract Schur proved that for any finite partition of the naturals, some cell contains two numbers and their sum. We use Ramsey’s theorem to prove a noncommutative Schur theorem for permutation quadruples {x, y, xy, yx}.

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