In this paper, we shall first prove that for a Halin graph G, 4 Β°xT (G) Β°6, where x T (G) is the vertex-face total chromatic number of G. Second, we shall establish a sufficient condition for a Halin graph to have a vertex-face total chromatic number of 6. Finally, we shall give a necessary and suff
Edge-face chromatic number of Halin-graphs
β Scribed by Zhongfu Zhang; Xinzhong Lu; Linzhong Liu; Jianfang Wang; Tongxin Gu
- Publisher
- Springer
- Year
- 1999
- Tongue
- English
- Weight
- 50 KB
- Volume
- 44
- Category
- Article
- ISSN
- 1001-6538
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π SIMILAR VOLUMES
## Abstract Given a simple plane graph __G__, an edgeβface __k__βcoloring of __G__ is a function Ο : __E__(__G__) βͺ __F__(G)βββ {1,β¦,__k__} such that, for any two adjacent or incident elements __a__, __b__ β __E__(__G__) βͺ __F__(__G__), Ο(__a__)ββ βΟ(__b__). Let Ο~e~(__G__), Ο~ef~(__G__), and Ξ(__G_
For any simple graph G, Vizing's Theorem [5] implies that A (G)~)((G)<~ A(G)+ 1, where A (G) is the maximum degree of a vertex in G and x(G) is the edge chromatic number. It is of course possible to add edges to G without changing its edge chromatic number. Any graph G is a spanning subgraph of an e
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