A Correction to “Incidence Matrices and Collineations of Finite Projective Planes” by Chat Yin Ho, Designs, Codes and Cryptography, 18 (1999), 159–162 |
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| Authors: | D. Brozovic C. Ho A. Munemasa |
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| Affiliation: | (1) Department of Mathematics, University of North Texas, P.O. Box 311430, Denton, TX, 76201-1430;(2) Department of Mathematics, University of Florida, Gainesville, FL, 32611-8105;(3) Kyushu University, 6-10-1 Hakozaki, Higashi-Ku, Fukuoka, 812-8581, Japan |
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| Abstract: | In this note we consider the set of incidence matrices of a cyclic projective planes whose set of points has cardinality a prime number p. We provide a correct proof of a result of Ho, showing that there exists an incidence matrix that possesses exactly p distinct eigenvalues. |
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| Keywords: | projective plane difference set incidence matrix Singer cycle |
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