Ononot — Consider a graph G defined by its adjacency matrix A. If the

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Graph Theorymedium

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Consider a graph $G$ defined by its adjacency matrix $A$ . If the eigenvalues of the adjacency matrix $A$ are $\lambda_1, \lambda_2, ..., \lambda_n$ , what is the sum of the squares of the eigenvalues $\sum_{i=1}^n \lambda_i^2$ equal to?