Small graphs with chromatic number 5: A
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Tommy Jensen; Gordon F. Royle
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Article
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1995
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John Wiley and Sons
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English
β 402 KB
## Abstract In this article we give examples of a triangleβfree graph on 22 vertices with chromatic number 5 and a __K__~4~βfree graph on 11 vertices with chromatic number 5. We very briefly describe the computer searches demonstrating that these are the smallest possible such graphs. All 5βcritica