Difference between revisions of "AM-GM inequality"

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#REDIRECT [[Arithmetic Mean-Geometric Mean Inequality]]
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In [[algebra]], the '''AM-GM inequality''', shorthand for the '''inequality of arithmetic and geometric means''', states that the arithmetic mean is greater than or equal to the geometric mean of any list of nonnegative reals; furthermore, equality holds if and only if every real in the list is the same.
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In symbols, the inequality states that for any <math>x_1,  x_2, \ldots, x_n \geq 0</math>, <cmath>\frac{x_1 + x_2 + \cdots + x_n}{n} \geq \sqrt[n]{x_1 x_2 \cdots x_n},</cmath> with equality if and only if <math>x_1 = x_2 = \cdots = x_n</math>.
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'''NOTE''': This article is a work-in-progress and meant to replace the [[Arithmetic mean-geometric mean inequality]] article, which is of poor quality.
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OUTLINE:
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* Proofs
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** Links to [[Proofs of AM-GM Inequality]]
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**
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* Generalizations
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** Weighted AM-GM
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** QM-AM-GM-HM (with or without weights)
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** Power Mean (with or without weights)

Revision as of 16:23, 27 November 2021

In algebra, the AM-GM inequality, shorthand for the inequality of arithmetic and geometric means, states that the arithmetic mean is greater than or equal to the geometric mean of any list of nonnegative reals; furthermore, equality holds if and only if every real in the list is the same.

In symbols, the inequality states that for any $x_1,  x_2, \ldots, x_n \geq 0$, \[\frac{x_1 + x_2 + \cdots + x_n}{n} \geq \sqrt[n]{x_1 x_2 \cdots x_n},\] with equality if and only if $x_1 = x_2 = \cdots = x_n$.

NOTE: This article is a work-in-progress and meant to replace the Arithmetic mean-geometric mean inequality article, which is of poor quality.

OUTLINE:

  • Generalizations
    • Weighted AM-GM
    • QM-AM-GM-HM (with or without weights)
    • Power Mean (with or without weights)