Question

Define identity fuction?

Answer 1

Answer:

The identity function is a function which returns the same value, which was used as its argument. ... In terms of relations and functions, this function f: P → P defined by b = f (a) = a for each a ϵ P, where P is the set of real numbers

Answer 2

Answer:

In mathematics, an identity function, also called an identity relation or identity map or identity transformation, is a function that always returns the same value that was used as its argument. That is, for f being identity, the equality f(x) = x holds for all x.