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Generalization for Laplacian energy
Authors:Jian-ping Liu  Bo-lian Liu
Institution:[1]School of Mathematics Sciences, South China Normal University, Guangzhou 510631, China [2]College of Mathematics and Computer Science, Fuzhou University, Fuzhou 350108, China
Abstract:Let G be a simple graph with n vertices and m edges. Let λ 1, λ 2, ..., λ n , be the adjacency spectrum of G, and let μ 1, μ 2, ..., μ n be the Laplacian spectrum of G. The energy of G is $ E\left( G \right) = \sum\limits_{i = 1}^n {\left| {\lambda _i } \right|} $ E\left( G \right) = \sum\limits_{i = 1}^n {\left| {\lambda _i } \right|} , while the Laplacian energy of G is defined as $ LE\left( G \right) = \sum\limits_{i = 1}^n {\left| {\mu _i - \frac{{2m}} {n}} \right|} $ LE\left( G \right) = \sum\limits_{i = 1}^n {\left| {\mu _i - \frac{{2m}} {n}} \right|} . Let γ 1, γ 2, ..., γ n be the eigenvalues of Hermite matrix A. The energy of Hermite matrix as $ HE\left( A \right) = \sum\limits_{i = 1}^n {\left| {\gamma _i - \frac{{tr\left( A \right)}} {n}} \right|} $ HE\left( A \right) = \sum\limits_{i = 1}^n {\left| {\gamma _i - \frac{{tr\left( A \right)}} {n}} \right|} is defined and investigated in this paper. It is a natural generalization of E(G) and LE(G). Thus all properties about energy in unity can be handled by HE(A).
Keywords:energy (of matrix)  Hermite matrix  eigenvalue
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