Circular chromatic number of subgraphs
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Hossein Hajiabolhassan; Xuding Zhu
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Article
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2003
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John Wiley and Sons
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English
β 107 KB
## Abstract This paper proves that every (__n__β+β)βchromatic graph contains a subgraph __H__ with $\chi \_c (H) = n$. This provides an easy method for constructing sparse graphs __G__ with $\chi\_c (G) = \chi ( G) = n$. It is also proved that for any Ξ΅β>β0, for any fraction __k/d__β>β2, there exis