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Laplacian Estrada and Normalized Laplacian Estrada Indices of Evolving Graphs

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  • Yilun Shang

Abstract

Large-scale time-evolving networks have been generated by many natural and technological applications, posing challenges for computation and modeling. Thus, it is of theoretical and practical significance to probe mathematical tools tailored for evolving networks. In this paper, on top of the dynamic Estrada index, we study the dynamic Laplacian Estrada index and the dynamic normalized Laplacian Estrada index of evolving graphs. Using linear algebra techniques, we established general upper and lower bounds for these graph-spectrum-based invariants through a couple of intuitive graph-theoretic measures, including the number of vertices or edges. Synthetic random evolving small-world networks are employed to show the relevance of the proposed dynamic Estrada indices. It is found that neither the static snapshot graphs nor the aggregated graph can approximate the evolving graph itself, indicating the fundamental difference between the static and dynamic Estrada indices.

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  • Yilun Shang, 2015. "Laplacian Estrada and Normalized Laplacian Estrada Indices of Evolving Graphs," PLOS ONE, Public Library of Science, vol. 10(3), pages 1-20, March.
    • Handle: RePEc:plo:pone00:0123426
    DOI: 10.1371/journal.pone.0123426
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