## identity function

### f(x) = x

The identity function is a mathematical concept that relates to functions. An identity function, denoted as f(x) = x, is a function that simply returns the same value as its input. It preserves the identity of the input value.

In simpler terms, if you have a value x, applying the identity function to x will give you the same value x as the result. For example, if you have the identity function f(x) = x and you apply it to 5, the result will be f(5) = 5.

Mathematically, the identity function can be written as:

f: X → X

Where X represents the domain of the function, and the function f maps each element in X back to itself.

The identity function is often used as a comparison or reference point when analyzing other functions. It helps establish a baseline and can be used to find properties like symmetry or inverses of other functions. Additionally, it has applications in fields such as algebra, calculus, and linear algebra.

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