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The Ethereal
A note on two-colorability of nonuniform hypergraphs
March 08, 2018 ยท The Ethereal ยท ๐ International Colloquium on Automata, Languages and Programming
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Authors
Lech Duraj, Grzegorz Gutowski, Jakub Kozik
arXiv ID
1803.03060
Category
math.CO: Combinatorics
Cross-listed
cs.DM,
cs.DS
Citations
5
Venue
International Colloquium on Automata, Languages and Programming
Last Checked
6 months ago
Abstract
For a hypergraph $H$, let $q(H)$ denote the expected number of monochromatic edges when the color of each vertex in $H$ is sampled uniformly at random from the set of size 2. Let $s_{\min}(H)$ denote the minimum size of an edge in $H$. Erdลs asked in 1963 whether there exists an unbounded function $g(k)$ such that any hypergraph $H$ with $s_{\min}(H) \geq k$ and $q(H) \leq g(k)$ is two colorable. Beck in 1978 answered this question in the affirmative for a function $g(k) = ฮ(\log^* k)$. We improve this result by showing that, for an absolute constant $ฮด>0$, a version of random greedy coloring procedure is likely to find a proper two coloring for any hypergraph $H$ with $s_{\min}(H) \geq k$ and $q(H) \leq ฮด\cdot \log k$.
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