Sylvester graph explained

Sylvester graph
Vertices:36
Edges:90
Automorphisms:1440
Radius:3
Diameter:3
Girth:5
Chromatic Number:4
Chromatic Index:5
Properties:Distance regular
Hamiltonian

The Sylvester graph is the unique distance-regular graphwith intersection array

\{5,4,2;1,1,4\}

.It is a subgraph of the Hoffman–Singleton graph.

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