Abstract
In the following, we deal with the problem of the existence of primitive strongly regular graphs with 1 in its spectrum and such that its regularity is between certain values with respect to the order of the graph. We consider the natural correspondence between the adjacency matrix of a strongly regular graph and the Euclidean Jordan algebra, \(\mathcal {B}\), generated by the natural powers of that matrix. Considering the spectrum of a constructed series of Hadamard powers an element of that Euclidean Jordan algebra \({\mathcal B}\), we establish a necessary condition for the existence of this kind of primitive strongly regular graphs.
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Acknowledgments
In this work Luís Vieira was partially supported by the Center of Research of Mathematics of University of Porto (UID/MAT/00144/2013), which is funded by FCT (Portugal) with national (MEC) and European structural funds through the programs FEDER, under the partnership agreement PT2020.
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Vieira, L.A., Mano, V.M. (2023). Power Series and Inequalities on the Parameters of a Strongly Regular Graph. In: Machado, J., et al. Innovations in Industrial Engineering II. icieng 2022. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-031-09360-9_8
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