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math.CO2013
The graphs with all but two eigenvalues equal to
Sebastian M. Cioabă, Willem H. Haemers, Jason Vermette +1
We determine all graphs whose adjacency matrix has at most two eigenvalues (multiplicities included) different from and decide which of these graphs are determined by their…
math.SP2013
An Interlacing Approach for Bounding the Sum of Laplacian Eigenvalues of Graphs
A. Abiad, M. A. Fiol, W. H. Haemers +1
We apply eigenvalue interlacing techniques for obtaining lower and upper bounds for the sums of Laplacian eigenvalues of graphs, and characterize equality. This leads to generaliza…