Inverse of a function
The inverse of a function is a function that "undoes" the action of a given function.
For example, consider the function given by the rule . The function has the property that . In this case, is called the (right) inverse function of . (Similarly, a function such that is called the left inverse function of . Typically the right and left inverses coincide on a suitable domain, and in this case we simply call the right and left inverse function the inverse function. Often the inverse of a function is denoted by .
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