An upper bound for the harmonious chromatic number of a graph G is given. Three corollaries of the theorem are theorems or improvements of the theorems of Miller and Pritikin. The assignment of colors to the vertices of a graph such that each vertex has exactly one color has been studied for well o
An upper bound for the path number of a graph
β Scribed by Alan Donald
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 529 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
The path number of a graph G, denoted p(G), is the minimum number of edgeβdisjoint paths covering the edges of G. LovΓ‘sz has proved that if G has u odd vertices and g even vertices, then p(G) β€ 1/2 u + g β 1 β€ n β 1, where n is the total number of vertices of G. This paper clears up an error in LovΓ‘sz's proof of the above result and uses an extension of his construction to show that p(G) β€ 1/2 u + [3/4__g__] β€ [3/4__n__].
π SIMILAR VOLUMES
The kdomination number of a graph G, y k ( G ) , is the least cardinality of a set U of verticies such that any other vertex is adjacent to at least k vertices of U. We prove that if each vertex has degree at least k. then YAG) 5 kp/(k + 1).
## Abstract The upper bound for the harmonious chromatic number of a graph that has been given by SinβMin Lee and John Mitchem is improved.
## Abstract In this paper we consider those graphs that have maximum degree at least 1/__k__ times their order, where __k__ is a (small) positive integer. A result of Hajnal and SzemerΓ©di concerning equitable vertexβcolorings and an adaptation of the standard proof of Vizing's Theorem are used to s