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- Cuiqin Lin, Guanzhang Hu, Zhongfu Zhang
- Discrete Mathematics
- 1995

It was shown (Kronk and Mitchen, 1973) that the set of vertices, edges and faces of any normal map on the sphere can be colored with seven colors. In this paper we solve a somewhat different problem: the set of edges and faces of any plane graph with A ~< 3 can be colored by six colors.

- Ronald C. Read, Guanzhang Hu
- Journal of Graph Theory
- 1987

- Huazhong Yang, Guanzhang Hu
- Science in China Series F: Information Sciences
- 2003

The spectrum of a graph is the set of all eigenvalues of the Laplacian matrix of the graph. There is a closed relationship between the Laplacian spectrum of graphs and some properties of graphs such as connectivity. In the recent years Laplacian spectrum of graphs has been widely applied in many fields. The application of Laplacian spectrum of graphs to… (More)

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