Problems sessions 92-05-29 and 92-05-31
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R.K. Guy
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Article
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2000
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Elsevier Science
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English
โ 206 KB
PROBLEM 1. (J. R. Henderson via H. Taylor) Is there a square matrix which, by permuting rows or columns, is transposable but not symmetrizable? Find an example and characterize all examples. Henderson has proved that there are none for 2 x 2, 3 x 3, or 4 x 4, and no such (0, 1) matrices with exactly