Math 2.0

Concept

Johnson graph

Summary

In mathematics, Johnson graphs are a special class of undirected graphs defined from systems of sets. The vertices of the Johnson graph J(n,k)J(n,k) are the kk-element subsets of an nn-element set; two vertices are adjacent when the intersection of the two vertices (subsets) contains (k−1)(k-1)-elements. Both Johnson graphs and the closely related Johnson scheme are named after Selmer M. Johnson.

Further reading

  1. Wikipedia, page 2948666, revision 1375553464, Johnson graph. adopted
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