## Abstract In the set of graphs of order __n__ and chromatic number __k__ the following partial order relation is defined. One says that a graph __G__ is less than a graph __H__ if __c__~__i__~(__G__) โค __c__~__i__~(__H__) holds for every __i__, __k__ โค __i__ โค __n__ and at least one inequality is
Maximal chromatic polynomials of connected planar graphs
โ Scribed by Ioan Tomescu
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 429 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0364-9024
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โฆ Synopsis
Abstract
In this paper we obtain chromatic polynomials of connected 3โ and 4โchromatic planar graphs that are maximal for positive integerโvalued arguments. We also characterize the class of connected 3โchromatic graphs having the maximum number of pโcolorings for p โฅ 3, thus extending a previous result by the author (the case p = 3).
๐ SIMILAR VOLUMES
## Abstract In this paper we obtain chromatic polynomials __P(G__; ฮป) of 2โconnected graphs of order __n__ that are maximum for positive integerโvalued arguments ฮป โง 3. The extremal graphs are cycles __C__~__n__~ and these graphs are unique for every ฮป โง 3 and __n__ โ 5. We also determine max{__P(
The concept of the star chromatic number of a graph was introduced by Vince (A. Vince, Star chromatic number, J. Graph Theory 12 (1988), 551--559), which is a natural generalization of the chromatic number of a graph. This paper calculates the star chromatic numbers of three infinite families of pla
The star-chromatic number of a graph, a parameter introduced by Vince, is a natural generalization of the chromatic number of a graph. Here we construct planar graphs with star-chromatic number r, where r is any rational number between 2 and 3, partially answering a question of Vince.
## Abstract The object of this paper is to show that 4โconnected planar graphs are uniquely determined from their collection of edgeโdeleted subgraphs.