Mathematics – Combinatorics
Scientific paper
2009-01-20
Mathematics
Combinatorics
4 pages; minor revisions, with updated references
Scientific paper
A classical result from graph theory is that every graph with chromatic number \chi > t contains a subgraph with all degrees at least t, and therefore contains a copy of every t-edge tree. Bohman, Frieze, and Mubayi recently posed this problem for r-uniform hypergraphs. An r-tree is an r-uniform hypergraph with no pair of edges intersecting in more than one vertex, and no sequence of distinct vertices and edges (v_1, e_1, ..., v_k, e_k) with all e_i \ni {v_i, v_{i+1}}, where we take v_{k+1} to be v_1. Bohman, Frieze, and Mubayi proved that \chi > 2rt is sufficient to embed every r-tree with t edges, and asked whether the dependence on r was necessary. In this note, we completely solve their problem, proving the tight result that \chi > t is sufficient to embed any r-tree with t edges.
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