English

Degrees in oriented hypergraphs and Ramsey p-chromatic number

Combinatorics 2011-12-15 v1

Abstract

The family D(k,m)D(k,m) of graphs having an orientation such that for every vertex vV(G)v \in V(G) either (outdegree) deg+(v)k\deg^+(v) \le k or (indegree) deg(v)m\deg^-(v) \le m have been investigated recently in several papers because of the role D(k,m)D(k,m) plays in the efforts to estimate the maximum directed cut in digraphs and the minimum cover of digraphs by directed cuts. Results concerning the chromatic number of graphs in the family D(k,m)D(k,m) have been obtained via the notion of dd-degeneracy of graphs. In this paper we consider a far reaching generalization of the family D(k,m)D(k,m), in a complementary form, into the context of rr-uniform hypergraphs, using a generalization of Hakimi's theorem to rr-uniform hypergraphs and by showing some tight connections with the well known Ramsey numbers for hypergraphs.

Keywords

Cite

@article{arxiv.1112.3302,
  title  = {Degrees in oriented hypergraphs and Ramsey p-chromatic number},
  author = {Yair Caro and Adriana Hansberg},
  journal= {arXiv preprint arXiv:1112.3302},
  year   = {2011}
}

Comments

24 pages

R2 v1 2026-06-21T19:51:23.542Z