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Newton's inequalities : ウィキペディア英語版
Newton's inequalities
In mathematics, the Newton inequalities are named after Isaac Newton. Suppose ''a''1, ''a''2, ..., ''a''''n'' are real numbers and let \sigma_k denote the ''k''th elementary symmetric function in ''a''1, ''a''2, ..., ''a''''n''. Then the elementary symmetric means, given by
:S_k = \frac}
satisfy the inequality
:S_S_\le S_k^2
with equality if and only if all the numbers ''a''''i'' are equal. Note that ''S''1 is the arithmetic mean, and ''S''n is the ''n''-th power of the geometric mean.
==See also==

* Maclaurin's inequality

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