Date of Original Version

9-8-2011

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Article

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Abstract or Description

Let K(k)n be the complete k-uniform hypergraph, k≥3, and let ℓ be an integer such that 1≤ℓ≤k−1 and k−ℓ divides n. An ℓ-overlapping Hamilton cycle in K(k)n is a spanning subhypergraph C of K(k)n with n/(k−ℓ) edges and such that for some cyclic ordering of the vertices each edge of C consists of k consecutive vertices and every pair of adjacent edges in Cintersects in precisely ℓ vertices.
We show that, for some constant c=c(k,ℓ) and sufficiently large n, for every coloring (partition) of the edges of K(k)n which uses arbitrarily many colors but no color appears more than cnk−ℓ times, there exists a rainbow ℓ-overlapping Hamilton cycle C, that is every edge of C receives a different color. We also prove that, for some constant c′=c′(k,ℓ) and sufficiently large n, for every coloring of the edges of K(k)n in which the maximum degree of the subhypergraph induced by any single color is bounded by c′nk−ℓ, there exists a properly colored ℓ-overlapping Hamilton cycle C, that is every two adjacent edges receive different colors. For ℓ=1, both results are (trivially) best possible up to the constants. It is an open question if our results are also optimal for 2≤ℓ≤k−1.
The proofs rely on a version of the Lovász Local Lemma and incorporate some ideas from Albert, Frieze, and Reed.

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Published In

Electronic Journal of Combinatorics, 19, 1, #P46.