Monotonicity of the matrix geometric mean
Monotonicity of the matrix geometric mean
复制标题
矩阵几何平均值的单调性
DOI:
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发表时间:
2012
期刊:
影响因子:
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通讯作者:
R. Karandikar
中科院分区:
文献类型:
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作者:
R. Bhatia;R. Karandikar
An attractive candidate for the geometric mean of m positive definite matrices A1, . . . , Am is their Riemannian barycentre G. One of its important operator theoretic properties, monotonicity in the m arguments, has been established recently by Lawson and Lim. We give an elementary proof of this property using standard matrix analysis and some counting arguments. We derive some new inequalities for G. One of these says that, for any unitarily invariant norm, ||| G ||| is not bigger than the geometric mean of |||A1|||, . . . , |||Am|||.