On the Co-PI and Laplacian Co-PI eigenvalues of a graph

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Abstract

In this paper we present an equivalent definition of Co-PI index and then determine the eigenvalues of Co-PI matrices and their Laplacians of Cartesian product graphs, including bounds on the second and third Co-PI spectral moment of a graph. The explicit formulae for the Co-PI index of Cartesian product graphs are also presented. © 2012 Elsevier B.V. All rights reserved.

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Su, G., Xiong, L., & Xu, L. (2013). On the Co-PI and Laplacian Co-PI eigenvalues of a graph. Discrete Applied Mathematics, 161(1–2), 277–283. https://doi.org/10.1016/j.dam.2012.08.019

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