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arXiv 1608.08671math.PR
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正随机变量均值期望的一个不等式

An inequality for expectation of means of positive random variables

Paolo Gibilisco, Frank Hansen

摘要:

设$X,Y$为正随机变量,$m$为交换均值.证明了不等式${\rm E} (m(X,Y)) \leq m({\rm E} (X), {\rm E} (Y))$成立当且仅当均值由凹函数生成.适当的变化,我们还证明了同样的不等式适用于所有的运营商手段在Kubo-Ando设置。C.R.证明了调和平均的情形。Rao和B.L.S. Prakasa Rao.

英文摘要:

Suppose that $X,Y$ are positive random variable and $m$ a numerical (commutative) mean. We prove that the inequality ${\rm E} (m(X,Y)) \leq m({\rm E} (X), {\rm E} (Y))$ holds if and only if the mean is generated by a concave function. With due changes we also prove that the same inequality holds for all operator means in the Kubo-Ando setting. The case of the harmonic mean was proved by C.R. Rao and B.L.S. Prakasa Rao.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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