pre-image

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pre-image

[¦prē′im·ij]
(mathematics)
For a point y in the range of a function ƒ, the set of points x in the domain of ƒ for which ƒ(x) = y.
For a subset A of the range of a function ƒ, the set of points x in the domain of ƒ for which ƒ(x) is a member of A. Also known as inverse image.
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