Eigenvalues of graphs and spectral Moore theorems

04/20/2020

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by   Sebastian M. Cioabă, et al.

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In this paper, we describe some recent spectral Moore theorems related to determining the maximum order of a connected graph of given valency and second eigenvalue. We show how these spectral Moore theorems have applications in Alon-Boppana theorems for regular graphs and in the classical degree-diameter/Moore problem.