indicator function
Sign in to saveAlso known as characteristic function
function that returns 1 if an element is present in a specified subset and 0 if absent; naturally isomorphic with a set's subsets
~14 min read
Article
A three-dimensional plot of an indicator function, shown over a square two-dimensional domain (set X): the "raised" portion overlays those two-dimensional points which are members of the "indicated" subset (A). In mathematics, an indicator function or a characteristic function of a subset of a set is a function that maps elements of the subset to one, and all other elements to zero. That is, if A is a subset of some set X, then the indicator function of A is the function
1
Connections
subset
Entity
Dirac delta function
Entity
mathematics
Entity
statistics
Entity
Greek alphabet
Entity
International Standard Book Number
Entity
Wikidata
Entity
function
Entity
number theory
Entity
real number
Entity
rational number
Entity
set
Entity
Kurt Gödel
Entity
digital object identifier
Entity
International Standard Serial Number
Entity
probability theory
Entity
combinatorics
Entity
random variable
Entity
variance
Entity
algebraic geometry
Entity