Abstract
A two-coloring is said to be equitable if, on the one hand, there are no monochromatic edges (the coloring is regular) and, on the other hand, the cardinalities of color classes differ from one another by at most 1. It is proved that, for the existence of an equitable two-coloring, it suffices that the number of edges satisfy an estimate of the same order as that for a regular coloring. This result strengthens the previously known Radhakrishnan-Srinivasan theorem.
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References
P. Erdős and A. Hajnal, “On a property of families of sets,” Acta Math. Acad. Sci. Hungar. 12 (1-2), 87–123 (1961).
J. Radhakrishnan and A. Srinivasan, “Improved bounds and algorithms for hypergraph 2-coloring,” Random Structures Algorithms 16(1), 4–32 (2000).
P. Erdős, “On a combinatorial problem. II,” Acta Math. Acad. Sci. Hungar. 15 (3-4), 445–447 (1964).
A. M. Raigorodskii and D. A. Shabanov, “The Erdős-Hajnal problem of hypergraph colouring, its generalizations, and related problems,” Uspekhi Mat. Nauk 66 (5(401)), 109–182 (2011) [Russian Math. Surveys 66 (5), 933–1002 (2011)].
A. Hajnal and E. Szemerédi, “Proof of a conjecture of P. Erdős,” in Combinatorial Theory and Its Applications, II (North-Holland, Amsterdam, 1970), pp. 601–623.
P. Erdős, “Extremal problems in graph theory,” in Theory of Graphs and its Applications (Publ. House Czechoslovak Acad. Sci., Prague, 1964), pp. 29–36.
H. A. Kierstead and A. V. Kostochka, “A short proof of the Hajnal-Szemerédi theorem on equitable colouring,” Combin. Probab. Comput. 17 (2), 265–270 (2008).
H. A. Kierstead, A. V. Kostochka, M. Mydlarz, and E. Szemerédi, “A fast algorithm for equitable coloring,” Combinatorica 30 (2), 217–224 (2010).
D. A. Shabanov, “Equitable two-colorings of uniform hypergraphs,” European J. Combin. 43, 185–203 (2015).
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Russian Text © The Author(s), 2019, published in Matematicheskie Zametki, 2019, Vol. 106, No. 3, pp. 323–332.
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Akhmejanova, M. On Equitable Colorings of Hypergraphs. Math Notes 106, 319–326 (2019). https://doi.org/10.1134/S0001434619090013
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DOI: https://doi.org/10.1134/S0001434619090013