Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4647925 | Discrete Mathematics | 2012 | 7 Pages |
Abstract
The first author showed that the list chromatic number of every graph with average degree dd is at least (0.5−o(1))log2d(0.5−o(1))log2d. We prove that for r≥3r≥3, every rr-uniform hypergraph in which at least half of the (r−1)(r−1)-vertex subsets are contained in at least dd edges has list chromatic number at least lnd100r3. When rr is fixed, this is sharp up to a constant factor.
Keywords
Related Topics
Physical Sciences and Engineering
Mathematics
Discrete Mathematics and Combinatorics
Authors
Noga Alon, Alexandr Kostochka,