The oriented chromatic number Ο o ( G) of an oriented graph G = (V, A) is the minimum number of vertices in an oriented graph H for which there exists a homomorphism of G to H. The oriented chromatic number Ο o (G) of an undirected graph G is the maximum of the oriented chromatic numbers of all the
Search and sweep numbers of finite directed acyclic graphs
β Scribed by Richard J. Nowakowski
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 719 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0166-218X
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
We propose an incremental algorithm to maintain a DFS-forest in a directed acyclic graph under a sequence of arc insertions in 0( nm) worst case total time, where n is the number of nodes and m is the number of arcs after the insertions. This compares favorably with the time required to recompute DF
## 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
We wrote many papers on these subjects, some in collaboration with Galvin, Rado, Shelah and Szemer6di, and posed many problems some of which turned out to be undecidable. In this survey we state some old and new solved and unsolved problems. Nous avons 6crit beaucoup d'articles, certains en collabo