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Dilation

Dilation is the act of expanding something. This term is usually used in the context of "dilating the eyes".

In mathematics, a dilation is a function f from a metric space into itself that satisfies the identity

where d(x,y) is the distance from x to y and r is some real number. A dilation of a Euclidean space is called a similarity.

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dilation".