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Further Remarks on Long Monochromatic Cycles in Edge-Colored Complete Graphs

Shinya Fujita1, Linda Lesniak2,3, Agnes Toth4
1Department of Integrated Design Engineering, Maebashi Institute of Technology, Maebashi 371-0816 Japan
2Department of Mathematics and Computer Science, Drew University, Madison, NJ 07940 USA
3 Department of Mathematics, Western Michigan University, Kalamazoo, MI 49008 USA
4Department of Computer Science and Information Theory, Budapest Univer- sity of Technology and Economics, 1521 Budapest, P.O. Box 91 Hungary,

Abstract

In [Discrete Math., 311 (2011), 688-689], Fujita defined f(r,n) to be the maximum integer k such that every r-edge-coloring of Kn contains a monochromatic cycle of length at least k. In this paper, we investigate the values of f(r,n) when n is linear in r. We determine the value of f(r,2r+2) for all r1 and show that f(r,sr+c)=s+1 if r is sufficiently large compared with positive integers s and c.