A matrix subadditivity inequality for symmetric norms
classification
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math.OA
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subadditivityando-zhanapplicationsblock-matricesbrown-kosakicartesiandecompositionextended
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Well-known subadditivity results for positive operators (of Brown-Kosaki and Rotfeld/Ando-Zhan types) are extended to Hermitian and normal ones. Applications to Cartesian decomposition and block-matrices are given.
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