Incidence graph of $(11,6,3)$-design

This is the incidence graph of the complementary design of the biplane on 11 points, and thus the distance-3 graph of its incidence graph.

Number of vertices:$22$
Diameter:$3$
Intersection array:$\{6,5,3;1,3,6\}$
Spectrum:$6^1 (\sqrt{3})^{10} (-\sqrt{3})^{10} (-6)^1$
Automorphism group:$ PGL(2,11)$
Distance-transitive:Yes
Bipartite




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Last updated: 31 March 2019