Choosability with separation of complete multipartite graphs and hypergraphs

preprint2011arXivOpen access

Abstract

For a hypergraph G and a positive integer s, let χ_{\ell} (G,s) be the minimum value of l such that G is L-colorable from every list L with |L(v)|=l for each v\in V(G) and |L(u)\cap L(v)|\leq s for all u, v\in e\in E(G). This parameter was studied by Kratochvíl, Tuza and Voigt for various kinds of graphs. Using randomized constructions we find the asymptotics of χ_{\ell} (G,s) for balanced complete multipartite graphs and for complete k-partite k-uniform hypergraphs.

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