English

Edge coloring complete uniform hypergraphs with many components

Combinatorics 2007-05-23 v1

Abstract

Let HH be a hypergraph. For a kk-edge coloring c:E(H){1,...,k}c : E(H) \to \{1,...,k\} let f(H,c)f(H,c) be the number of components in the subhypergraph induced by the color class with the least number of components. Let fk(H)f_k(H) be the maximum possible value of f(H,c)f(H,c) ranging over all kk-edge colorings of HH. If HH is the complete graph KnK_n then, trivially, f1(Kn)=f2(Kn)=1f_1(K_n)=f_2(K_n)=1. In this paper we prove that for n6n \geq 6, f3(Kn)=n/6+1f_3(K_n)=\lfloor n/6 \rfloor+1 and supply close upper and lower bounds for fk(Kn)f_k(K_n) in case k4k \geq 4. Several results concerning the value of fk(Knr)f_k(K_n^r), where KnrK_n^r is the complete rr-uniform hypergraph on nn vertices, are also established.

Keywords

Cite

@article{arxiv.math/0202231,
  title  = {Edge coloring complete uniform hypergraphs with many components},
  author = {Yair Caro and Raphael Yuster},
  journal= {arXiv preprint arXiv:math/0202231},
  year   = {2007}
}

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14 pages