👉 In mathematics, a discrete function is a function that assigns to each element of its domain at most one value. For example, the function f(x) = 2x - 1 on the set {0, 1, 2} is a discrete function because it assigns exactly two values to each element in the set. Discrete functions are fundamental in many areas such as computer science, signal processing, and probability theory. They are used to model real-world phenomena that have discrete or finite