# characteristic function

## Contents

## EnglishEdit

### NounEdit

**characteristic function** (*plural* **characteristic functions**)

- (analysis) A function which is equal to 1 for all points in its domain which belong to a given set, and is equal to 0 for all points in the domain which do not belong to that given set.
- (mathematics, probability theory) A complex function completely defining the probability distribution of a real-valued random variable

#### Usage notesEdit

- The characteristic function of a set
*A*is often represented as χ_{A}.

#### SynonymsEdit

- (function equal to 1 on elements of a given set): indicator function

#### HypernymsEdit

#### HyponymsEdit

#### TranslationsEdit

function equal to one on elements of a given set —

*see*indicator functiona complex function completely defining a probability distribution