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Levinson's inequality : ウィキペディア英語版
Levinson's inequality
In mathematics, Levinson's inequality is the following inequality, due to Norman Levinson, involving positive numbers. Let a>0 and let f be a given function having a third derivative on the range (0,2a), and such that
:f(x)\geq 0
for all x\in (0,2a). Suppose 0 for i = 1, \ldots, n and 0. Then
: \frac-f\left(\frac\right)\le\frac-f\left(\frac\right).
The Ky Fan inequality is the special case of Levinson's inequality where
:p_i=1,\ a=\frac,
and
:f(x)=\log x. \,
==References==
*Scott Lawrence and Daniel Segalman: ''A generalization of two inequalities involving means'', Proceedings of the American Mathematical Society. Vol 35 No. 1, September 1972.
*Norman Levinson: ''Generalization of an inequality of Ky Fan'', Journal of Mathematical Analysis and Applications. Vol 8 (1964), 133–134.


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