## PREIMAGE

### preimage

#### Noun

- The set containing exactly every member of the domain of a function such that the member is mapped by the function onto an element of a given subset of the codomain of the function. Formally, of a subset
*B*of the codomain*Y*under a function ƒ, the subset of the domain*X*defined by- <math>f^{-1}(B) = \{x \in X : f(x) \in B\}.</math>
- For example, the preimage of {4, 9} under the squaring function is the set {−3,−2,+2,+3}.

*The above text is a snippet from Wiktionary: preimage*

and as such is available under the Creative Commons Attribution/Share-Alike License.

and as such is available under the Creative Commons Attribution/Share-Alike License.