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).
