In mathematics, there are two different results that share the common name of the Ky Fan inequality. One is an inequality involving the geometric mean and arithmetic mean of two sets of real numbers of the unit interval. The result was published on page 5 of the book Inequalities by Edwin F. Beckenbach and Richard E. Bellman (1961), who refer to an unpublished result of Ky Fan. They mention the result in connection with the inequality of arithmetic and geometric means and Augustin Louis Cauchy's proof of this inequality by forward-backward-induction; a method which can also be used to prove the Ky Fan inequality.
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| - Ky-Fan-Ungleichung (de)
- Ky Fan inequality (en)
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| - In der Mathematik wird als Ky-Fan-Ungleichung eine von Ky Fan entdeckte und erstmals von (: Beckenbach und Bellman, 1983) publizierte Ungleichung bezeichnet. Ihre Bedeutung liegt vor allem darin, dass sie durch ihre Ähnlichkeit mit der Ungleichung vom arithmetischen und geometrischen Mittel Ausgangspunkt für weitere Verallgemeinerungen ist. (de)
- In mathematics, there are two different results that share the common name of the Ky Fan inequality. One is an inequality involving the geometric mean and arithmetic mean of two sets of real numbers of the unit interval. The result was published on page 5 of the book Inequalities by Edwin F. Beckenbach and Richard E. Bellman (1961), who refer to an unpublished result of Ky Fan. They mention the result in connection with the inequality of arithmetic and geometric means and Augustin Louis Cauchy's proof of this inequality by forward-backward-induction; a method which can also be used to prove the Ky Fan inequality. (en)
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| - In der Mathematik wird als Ky-Fan-Ungleichung eine von Ky Fan entdeckte und erstmals von (: Beckenbach und Bellman, 1983) publizierte Ungleichung bezeichnet. Ihre Bedeutung liegt vor allem darin, dass sie durch ihre Ähnlichkeit mit der Ungleichung vom arithmetischen und geometrischen Mittel Ausgangspunkt für weitere Verallgemeinerungen ist. (de)
- In mathematics, there are two different results that share the common name of the Ky Fan inequality. One is an inequality involving the geometric mean and arithmetic mean of two sets of real numbers of the unit interval. The result was published on page 5 of the book Inequalities by Edwin F. Beckenbach and Richard E. Bellman (1961), who refer to an unpublished result of Ky Fan. They mention the result in connection with the inequality of arithmetic and geometric means and Augustin Louis Cauchy's proof of this inequality by forward-backward-induction; a method which can also be used to prove the Ky Fan inequality. This Ky Fan inequality is a special case of Levinson's inequality and also the starting point for several generalizations and refinements; some of them are given in the references below. The second Ky Fan inequality is used in game theory to investigate the existence of an equilibrium. (en)
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