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Reference.org
Sylvester graph
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<p>The Sylvester graph is the unique <a href="/facts/Distance_regular_graph/pGAuLWYL">distance-regular</a> graph with intersection array { 5 , 4 , 2 ; 1 , 1 , 4 } {\displaystyle \{5,4,2;1,1,4\}} . It is a subgraph of the <a href="/facts/Hoffman%25E2%2580%2593Singleton_graph/fqSQJhGw">Hoffman–Singleton graph</a>. </p>