期刊
POSITIVITY
卷 11, 期 2, 页码 239-250出版社
SPRINGER
DOI: 10.1007/s11117-006-2054-6
关键词
singular values; trace of operators; Holder and Young inequalities
类别
If A(1),..., A(m) are positive semidefinite n x n matrices, and if p(1),..., p(m) are positive real numbers such that 1/p(1) + ... + 1/p(m) = 1, then [GRAPHICS] where vertical bar X vertical bar denotes (X*X)(1/2) and tr (X) denotes the trace of X. Moreover, equality holds in either of these inequalities if and only if A p(1)(p1) = ... = A(m)(pm). This result will be shown to hold as well in unital C*-algebras that have a faithful tracial state.
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