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math.CO2017
Edge-regular graphs with regular cliques
Gary R. W. Greaves, Jack H. Koolen
We exhibit infinitely many examples of edge-regular graphs that have regular cliques and that are not strongly regular. This answers a question of Neumaier from 1981.
math.CO2017
On a lower bound for the Laplacian eigenvalues of a graph
Gary R. W. Greaves, Akihiro Munemasa, Anni Peng
If and denote, respectively, the -th largest Laplacian eigenvalue and the -th largest vertex degree of a graph, then . This inequality was…