For a pair of integers 1 F β₯r, the β₯-chromatic number of an r-uniform Ε½ . 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 β₯ for every e g E. In this paper we determine the asymptotic 1 k i Ε½ . behavior of the β₯-chromatic n
Random hypergraph coloring algorithms and the weak chromatic number
β Scribed by Jeanette Schmidt-Pruzan; Eli Shamir; Eli Upfal
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 610 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
β¦ Synopsis
We present a hypergraph coloring algorithm and analyze its performance in spaces of random hypergraphs. In these spaces the number of colors used by our algorithm is almost surely within a small constant factor (less than 2) of the weak chromatic number of the hypergraph. This also establishes new upper and lower bounds for the weak chromatic number of uniform hypergra p hs.
π SIMILAR VOLUMES
In the Post lattice of the families of closed systems (r.e. sets CT ooolean functions closed with respect to composition) the particular systems of mionotonic functions are closely related to the classitication of hypergraphs by their weak chromatic numbers. It is shown also that ffor k r 3, the k-c
## Abstract Star chromatic number, introduced by A. Vince, is a natural generalization of chromatic number. We consider the question, βWhen is Ο\* < Ο?β We show that Ο\* < Ο if and only if a particular digraph is acyclic and that the decisioin problem associated with this question is probably not i
## Abstract Most upper bounds for the chromatic index of a graph come from algorithms that produce edge colorings. One such algorithm was invented by Vizing [Diskret Analiz 3 (1964), 25β30] in 1964. Vizing's algorithm colors the edges of a graph one at a time and never uses more than Ξ+Β΅ colors, wh