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Akbari, S.; Ghodrati, A. H.; Hosseinzadeh, M. A.; Kabanov, V. V.; Konstantinova, E. V.; Shalaginov, L. V.
Linear & multilinear algebra, 01/2022, Volume: 70, Issue: 2Journal Article
A Deza graph with parameters is a k-regular graph with n vertices such that any two of its vertices have b or a common neighbours, where . In this paper we investigate spectra of Deza graphs. In particular, using the eigenvalues of a Deza graph we determine the eigenvalues of its children. Divisible design graphs are significant cases of Deza graphs. Sufficient conditions for Deza graphs to be divisible design graphs are given, a few families of divisible design graphs are presented and their properties are studied. Our special attention goes to the invertibility of the adjacency matrices of Deza graphs.
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