Eigenvalues & Eigenvectorshard
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Let AA and BB be n×nn \times n Hermitian matrices. Let the eigenvalues of A,BA, B, and A+BA+B be sorted in descending order: α1α2αn\alpha_1 \ge \alpha_2 \ge \dots \ge \alpha_n, β1β2βn\beta_1 \ge \beta_2 \ge \dots \ge \beta_n, and γ1γ2γn\gamma_1 \ge \gamma_2 \ge \dots \ge \gamma_n. Which inequality is guaranteed to hold for all 1in1 \le i \le n?