Geodesic
On the spectrum of Cayley graphs
Algebra and discrete mathematics, Tome 30 (2020) no. 2, pp. 194-206

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The set of eigenvalues of the adjacency matrix of a graph is called the spectrum of it. In the present paper, we introduce the spectrum of Cayley graphs of order $pqr$ in terms of character table, where $p,q,r$ are prime numbers. We also, stablish some properties of Cayley graphs of non-abelian groups with a normal symmetric connected subset.
Keywords: Cayley graphs, symmetric set, semi-direct product, characteristic polynomial. 
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     author = {M. Ghorbani and M. Songhor},
     title = {On the spectrum of  {Cayley} graphs},
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M. Ghorbani; M. Songhor. On the spectrum of  Cayley graphs. Algebra and discrete mathematics, Tome 30 (2020) no. 2, pp. 194-206. http://geodesic.mathdoc.fr/item/ADM_2020_30_2_a3/