**Identity Function**

The function*f*(*x*) = *x*. More generally, an identity function is one which does not change the domain values at all.

Note: This is called the identity function since it is the identity for composition of functions. That is, if *f*(*x*) = *x* and *g* is any function, then (*f*°*g*)(*x*) = *g*(*x*) and (*g*°*f*)(*x*) = *g*(*x*).

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