English

The list coloring number of uncrowded hypergraphs

Combinatorics 2026-07-06 v1

Abstract

We prove that for every fixed integer r2r\geq 2 and every ε>0\varepsilon>0, every sufficiently large finite uncrowded (r+1)(r+1)-uniform hypergraph of maximum degree Δ\Delta has list chromatic number at most (1+ε)(rΔlogΔ)1/r. (1+\varepsilon)\left(\frac{r\Delta}{\log\Delta}\right)^{1/r}. The proof is a semi-random list-coloring nibble carried out directly on the original hypergraph. We encode the remaining coloring problem by active edge-color constraints and control all residual sizes through a binomial degree bound. After the nibble reaches a sparse terminal state, the coloring is completed by a Rosenfeld-style counting argument.

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Cite

@article{arxiv.2607.05256,
  title  = {The list coloring number of uncrowded hypergraphs},
  author = {Jing Yu and Junchi Zhang},
  journal= {arXiv preprint arXiv:2607.05256},
  year   = {2026}
}

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19 pages