Volume 2, 2019
|Number of page(s)||19|
|Section||Mathematics - Applied Mathematics|
|Published online||02 July 2019|
Euclidean Jordan algebras and some conditions over the spectra of a strongly regular graph
Department of Cívil Engineering of University of Porto, Street Roberto Frias, 0351-4200-465 Porto, Portugal
* Corresponding author: email@example.com
Accepted: 13 May 2019
Let G be a primitive strongly regular graph G such that the regularity is less than half of the order of G and A its matrix of adjacency, and let 𝒜 be the real Euclidean Jordan algebra of real symmetric matrices of order n spanned by the identity matrix of order n and the natural powers of A with the usual Jordan product of two symmetric matrices of order n and with the inner product of two matrices being the trace of their Jordan product. Next the spectra of two Hadamard series of 𝒜 associated to A2 is analysed to establish some conditions over the spectra and over the parameters of G.
Key words: Euclidean Jordan algebras / Strongly regular graphs / Admissibility conditions
© L. Vieira, Published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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