Strongly regular graph: Difference between revisions

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===Triangle-free graphs===
The strongly regular graphs with λ = 0 are [[triangle-free graph|triangle free]]. Apart from the complete graphs on lessfewer than 3 vertices and all complete bipartite graphs, the seven listed earlier (pentagon, Petersen, Clebsch, Hoffman-Singleton, Gewirtz, Mesner-M22, and Higman-Sims) are the only known ones.
 
===Geodetic graphs===