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The number $S_k(G):=\\sum_{i=1}^{n}\\lambda_i^k(G)\\,(k=0, 1, ..., n-1)$ is called the $k$th spectral moment of $G$. Let $S(G)=(S_0(G), S_1(G),..., S_{n-1}(G))$ be the sequence of spectral moments of $G$. 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For a graph $G$ with $n$ vertices, let $A(G)$ be its adjacency matrix with eigenvalues $\\lambda_1(G), \\lambda_2(G), ..., \\lambda_n(G)$ in non-increasing order. The number $S_k(G):=\\sum_{i=1}^{n}\\lambda_i^k(G)\\,(k=0, 1, ..., n-1)$ is called the $k$th spectral moment of $G$. Let $S(G)=(S_0(G), S_1(G),..., S_{n-1}(G))$ be the sequence of spectral moments of $G$. 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