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Retkes identities : ウィキペディア英語版
Retkes identities

In mathematics, the Retkes Identities, named after Zoltán Retkes, are one of the most efficient applications of the Retkes inequality, when f(u)=u^, 0\leq u <\infty , and 0\leq\alpha. In this special setting, one can have for the iterated integrals
: F^(s)=\frac.
The notation is explained at Hermite–Hadamard inequality.
== Particular cases ==
Since f is strictly convex if \alpha >1, strictly concave if 0<\alpha<1, linear if \alpha=0,1, the following inequalities and identities hold:
* 1<\alpha\quad\quad\quad\quad\frac\sum_^n\frac<\frac\sum_^n x_i^
* \alpha=1\quad\quad\quad\quad\sum_^n\frac=\sum_^n x_i
* 0<\alpha<1\quad\quad\frac \sum_^n\frac>\frac\sum_^n x_i^
* \alpha=0\quad\quad\quad\quad\sum_^n\frac=1.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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