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- W2079801130 abstract "For a finite projective plane , let denote the maximum number of classes in a partition of the point set, such that each line has at least two points in the same partition class. We prove that the best possible general estimate in terms of the order of projective planes is , which is tight apart from a multiplicative constant in the third term : (1) As holds for every projective plane of order q. (2) If q is a square, then the Galois plane of order q satisfies . Our results asymptotically solve a ten-year-old open problem in the coloring theory of mixed hypergraphs, where is termed the upper chromatic number of . Further improvements on the upper bound (1) are presented for Galois planes and their subclasses. © 2007 Wiley Periodicals, Inc. J Combin Designs 16: 221–230, 2008" @default.
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- W2079801130 date "2008-01-01" @default.
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- W2079801130 title "Upper chromatic number of finite projective planes" @default.
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- W2079801130 doi "https://doi.org/10.1002/jcd.20169" @default.
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