Higman-Sims graph

In mathematics, the Higman-Sims graph is the unique strongly regular graph with 100 vertices and valency 22, where no neighboring pair of verticies share a common neighbor and each non-neighboring pair of verticies share six common neighbors. It was constructed as a way to define the Higman-Sims group, and that group is a subgroup of index two in the group of automorphisms of the Higman-Sims graph.



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