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On the eigenvalues of Euclidean distance matricesKeywords: Euclidean distance matrices , eigenvalues , equitable partitions , characteristic polynomial Abstract: In this paper, the notion of equitable partitions (EP) is used to study the eigenvalues of Euclidean distance matrices (EDMs). In particular, EP is used to obtain the characteristic polynomials of regular EDMs and non-spherical centrally symmetric EDMs. The paper also presents methods for constructing cospectral EDMs and EDMs with exactly three distinct eigenvalues.
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