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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 denote the ''k''th elementary symmetric function in ''a''1, ''a''2, ..., ''a''''n''. Then the elementary symmetric means, given by : satisfy the inequality : 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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