Let H be a k-uniform hypergraph in which no two edges share more than t common vertices, and let D denote the maximum degree of a vertex of H. We conjecture that for every =>0, if D is sufficiently large as a function of t, k, and =, then the chromatic index of H is at most (t&1+1Ât+=) D. We prove t
Chromatic Index of Hypergraphs and Shannon’s Theorem
✍ Scribed by Tomáš Dvořák
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 85 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0195-6698
No coin nor oath required. For personal study only.
✦ Synopsis
A classical theorem of Claude Shannon states that for any multigraph G without loops, χ (G) ≤ 3 2 (G) . We suggest a generalization of Shannon's theorem to hypergraphs and prove it in case of hypergraphs without repeated edges of size 2.
📜 SIMILAR VOLUMES
For a pair of integers 1 F ␥r, the ␥-chromatic number of an r-uniform Ž . hypergraph H s V, E is the minimal k, for which there exists a partition of V into subsets < < T, . . . , T such that e l T F ␥ for every e g E. In this paper we determine the asymptotic 1 k i Ž . behavior of the ␥-chromatic n
Burr recently proved [3] that for positive integers m , , m 2 , . . , , m, and any graph G we have x(G) 5 &, if and only if G can be expressed as the edge disjoint union of subgraphs F, satisfying x(F,) 5 m,. This theorem is generalized to hypergraphs. By suitable interpretations the generalization
The aim of this paper is to unify interchange theorems and extend them to hypergraphs. To this end sufficient conditions for equality of the l 1 -distance between equivalence classes and the l 1 -distance between corresponding order-type functions are provided. The generality of this result is demon
The strong chromatic index of a graph G, denoted sq(G), is the minimum number of parts needed to partition the edges of G into induced matchings. For 0 ≤ k ≤ l ≤ m, the subset graph S m (k, l) is a bipartite graph whose vertices are the kand l-subsets of an m element ground set where two vertices ar
Let T2 be the graph obtained from the Petersen graph by first deleting a vertex and then contracting an edge incident to a vertex of degree two. We give a simple characterization of the graphs that contain no subdivision of T2. This characterization is used to show that if every planar r-graph is r-