Preimage

The preimage of a point under a function is the set $f^(-1)(y)={x in X:f(x)=y}$ , consisting of all whose image is . The image of is . Images are elements of the range, while preimages are subsets (possibly the empty set) of the domain.

Portions of this entry contributed by Todd Rowland

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Cite this as:

Weisstein, Eric W., with contributions by Todd Rowland. "Preimage." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Preimage.html

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