Line graph of Heawood graph

Number of vertices:$21$
Diameter:$3$
Intersection array:$\{4,2,2; 1,1,2\}$
Spectrum:$4^1 (1+\sqrt{2})^6 (1-\sqrt{2})^6 (-2)^8$
Automorphism group:$PGL(2,7)$
Distance-transitive:Yes
Primitive




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Last updated: 4 February 2017