A note on two-colorability of nonuniform hypergraphs
Combinatorics
2021-12-17 v1 Discrete Mathematics
Data Structures and Algorithms
Abstract
For a hypergraph , let denote the expected number of monochromatic edges when the color of each vertex in is sampled uniformly at random from the set of size 2. Let denote the minimum size of an edge in . Erd\H{o}s asked in 1963 whether there exists an unbounded function such that any hypergraph with and is two colorable. Beck in 1978 answered this question in the affirmative for a function . We improve this result by showing that, for an absolute constant , a version of random greedy coloring procedure is likely to find a proper two coloring for any hypergraph with and .
Cite
@article{arxiv.1803.03060,
title = {A note on two-colorability of nonuniform hypergraphs},
author = {Lech Duraj and Grzegorz Gutowski and Jakub Kozik},
journal= {arXiv preprint arXiv:1803.03060},
year = {2021}
}