Strongly regular graphs with second eigenvalue 6 and =0
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J. Koolen proposed the problem of studying distance-regular graphs in which the neighborhoods of vertices are strongly regular graphs with second eigenvalue ≤ t for a given positive integer t. Earlier Koolen’s problem was solved for t ≤ 5. In this paper we consider strongly regular graphs with second eigenvalue 6 and λ=0. They are neighborhoods of vertices of distance-regular graphs satisfying the Koolen’s problem for t=6.
Strongly regular graph, eigenvalue, distance-regular graph
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IDR: 140285742
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