Indikaatorfunktsioonid
Indikaatorfunktsioonid, also known as characteristic functions or indicator variables, are functions that map elements of a set to either 0 or 1. Specifically, for a given set S and a subset A of S, the indicator function of A, often denoted as 1_A or I_A, is defined as: 1_A(x) = 1 if x is an element of A, and 1_A(x) = 0 if x is not an element of A. This function effectively indicates whether an element belongs to a particular subset.
These functions are fundamental in various fields of mathematics, particularly in probability theory and set theory.
Indicator functions also play a role in set operations. For instance, the indicator function of the union