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Dilation (metric space) : ウィキペディア英語版 | Dilation (metric space) In mathematics, a dilation is a function from a metric space into itself that satisfies the identity : for all points , where is the distance from to and is some positive real number.〔.〕 In Euclidean space, such a dilation is a similarity of the space.〔. See in particular (p. 110 ).〕 Dilations change the size but not the shape of an object or figure. Every dilation of a Euclidean space that is not a congruence has a unique fixed point〔.〕 that is called the center of dilation.〔.〕 Some congruences have fixed points and others do not.〔.〕 ==See also==
* Homothety * Dilation (operator theory)
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