Matrix norm inequalities and the relative Dixmier property |
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Authors: | Kenneth Berman Herbert Halpern Victor Kaftal Gary Weiss |
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Institution: | 1. Department of Computer Science, University of Cincinnati, 45221, Cincinnati, Ohio, USA 2. Department of Mathematical Sciences, University of Cincinnati, 45221, Cincinnati, Ohio, USA
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Abstract: | If x is a selfadjoint matrix with zero diagonal and non-negative entries, then there exists a decomposition of the identity into k diagonal orthogonal projections {pm} for which $$\parallel \sum p_m xp_m \parallel \leqslant (1/k)\parallel x\parallel $$ From this follows that all bounded matrices with non-negative entries satisfy the relative Dixmier property or, equivalently, the Kadison Singer extension property. This inequality fails for large Hadamard matrices. However a similar inequality holds for all matrices with respect to the Hilbert-Schmidt norm with constant k?1/2 and for Hadamard matrices with respect to the Schatten 4-norm with constant 21/4k?1/2. |
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