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2006-11-04 21:46 David Eppstein 256×256×0 (1992 bytes) The [[Paley graph]] of order 9, colored with three colors and showing a clique of three vertices. In this graph and each of its subgraphs the [[chromatic number]] equals the [[clique number]], so it is a [[perfect graph]].
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{{Information |Description=The Paley graph of order 9, colored with three colors and showing a clique of three vertices. In this graph and each of its subgraphs the chromatic number equals the [[:en:clique numb