Concept

Inverse Function Notation

The inverse of a function ff is denoted f1f^{-1}, read as 'ff inverse.' The notation f1(x)f^{-1}(x) represents the value of the inverse function at the input xx. It is important to understand that the superscript 1-1 in f1f^{-1} does not indicate an exponent or a reciprocal — it is a special symbol indicating the inverse function that 'undoes' the action of ff. For example, if ff adds 55 to every input, then f1f^{-1} subtracts 55 from every input to return to the original value.

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Updated 2026-05-26

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