Identity function
In mathematics, a function that always returns the same value that was used as its argument / From Wikipedia, the free encyclopedia
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Not to be confused with Null function or Empty function.
In mathematics, an identity function, also called an identity relation, identity map or identity transformation, is a function that always returns the value that was used as its argument, unchanged. That is, when f is the identity function, the equality f(x) = x is true for all values of x to which f can be applied.