7-critical graphs of bounded genus
โ Scribed by Bojan Mohar
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 186 KB
- Volume
- 112
- Category
- Article
- ISSN
- 0012-365X
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๐ SIMILAR VOLUMES
The average orientable genus of graphs has been the subject of a considerable number of recent investigations. It is the purpose of this article to examine the extent to which the average genus of the amalgamation of graphs fails to be additive over its constituent subgraphs. This discrepancy is bou
Let G be a simple graph with n vertices and orientable genus g and non-orientable genus h. Let \(G) be the spectral radius of the adjacency matrix A of G. We obtain the following sharp bounds of \(G): (1) \(G) 1+-3n+12g&8; (2) \(G) 1+-3n+6h&8.
It is proved that every connected simplicial graph with minimum valence at least three has maximum genus at least one-quarter of its cycle rank. This follows from the technical result that every 3-regular simplicial graph except K4 has a Xuong co-tree whose odd components have only one edge each. It