Noun

(en noun)

(mathematics) 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

$f^\{-1\}(B)\; =\; \backslash \{x\; \backslash in\; X\; :\; f(x)\; \backslash in\; B\backslash \}.$

For example, the preimage of {4, 9} under the squaring function is the set {?3,?2,+2,+3}.

Noun

(en noun)

An optical or other representation of a real object; a graphic; a picture.

The Bible forbids the worship of graven images .

* {{quote-magazine, date=2012-03

, author=, title=Pixels or Perish , volume=100, issue=2, page=106, magazine=(American Scientist) citation , passage=Drawings and pictures are more than mere ornaments in scientific discourse. Blackboard sketches, geological maps, diagrams of molecular structure, astronomical photographs, MRI images , the many varieties of statistical charts and graphs: These pictorial devices are indispensable tools for presenting evidence, for explaining a theory, for telling a story.}}

A mental picture of something not real or not present.

* {{quote-magazine, date=2013-08-03, volume=408, issue=8847, magazine=(The Economist)

, title= Revenge of the nerds , passage=Think of banking today and the image is of grey-suited men in towering skyscrapers. Its future, however, is being shaped in converted warehouses and funky offices in San Francisco, New York and London, where bright young things in jeans and T-shirts huddle around laptops, sipping lattes or munching on free food.}}

(computing) A file that contains all information needed to produce a live working copy. (see disk image, executable image and image copy)

Most game console emulators do not come with any ROM images for copyright reasons.

A characteristic of a person, group or company etc., style, manner of dress, how one is, or wishes to be, perceived by others.

(mathematics) Something mapped to by a function.

The number 6 is the image of 3 under ''f'' that is defined as f(x) = 2*x.

(mathematics) The subset of a codomain comprising those elements that are images of something.

The image of this step function is the set of integers.

(obsolete) Show; appearance; cast.

* Dryden

The face of things a frightful image bears.