Abstract
Let σ1(X)≤ · ≤ σN(X)≤0 denote the ordered singular values ofan n × n matrix X and let α1 (X) ≤ α2(X)≤ · ≤ αn(X) denote its ordered main diagonal entries (assuming that they are real). Let B be any complex n × n skew-symmetric matrix and ||.|| any unitarily invariant norm. It is shown that for any rea positive semidefinite n × n matrix A.

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