55 citations · 99 across the 10 of their papers we have counts for
Showing 2014 · math.COShow all
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math.CO2014★ 8 cited
Graphs with many valencies and few eigenvalues
Edwin R. van Dam, Jack H. Koolen, Zheng-jiang Xia
Dom de Caen posed the question whether connected graphs with three distinct eigenvalues have at most three distinct valencies. We do not answer this question, but instead construct…
math.CO2014★ 5 cited
The Laplacian spectral excess theorem for distance-regular graphs
Edwin R. van Dam, Miquel Angel Fiol
The spectral excess theorem states that, in a regular graph G, the average excess, which is the mean of the numbers of vertices at maximum distance from a vertex, is bounded above…