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单词 Kakutani theorem
释义

Kakutani theorem

英语百科

Kakutani fixed-point theorem

(重定向自Kakutani theorem)
Fixed points for f(x)=[1−x/2, 1−x/4]
A function without fixed points

In mathematical analysis, the Kakutani fixed-point theorem is a fixed-point theorem for set-valued functions. It provides sufficient conditions for a set-valued function defined on a convex, compact subset of a Euclidean space to have a fixed point, i.e. a point which is mapped to a set containing it. The Kakutani fixed point theorem is a generalization of Brouwer fixed point theorem. The Brouwer fixed point theorem is a fundamental result in topology which proves the existence of fixed points for continuous functions defined on compact, convex subsets of Euclidean spaces. Kakutani's theorem extends this to set-valued functions.

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更新时间:2025/6/21 5:08:42