PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 63 (77), pp. 3746 (1998) 

On formal products and the Seidel spectrum of graphsMirko Lepovi\'cPrirodnomatemati\v cki fakultet, Kragujevac, YugoslaviaAbstract: In Lepovi\'c [2] using the formal product and the socalled formal generating functions, we proved some results concerning cospectral graphs. In this paper, we define the Seidel formal product and investigate some properties of the Seidel spectrum. In particular, for any two overgraphs $G_{S_1}$ and $G_{S_2}$ of $G$ we give necessary and sufficient conditions under which $G_{S_1}$ and $G_{S_2}$ have the same Seidel spectrum. Classification (MSC2000): 05C50 Full text of the article:
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