Concept

Domain and Range of an Inverse Function

When a one-to-one function ff and its inverse f1f^{-1} are compared, their domains and ranges are interchanged. Specifically, the domain of ff equals the range of f1f^{-1}, and the domain of f1f^{-1} equals the range of ff. For instance, if f={(0,5),(1,6),(2,7),(3,8)}f = \{(0, 5), (1, 6), (2, 7), (3, 8)\}, then the domain of ff is {0,1,2,3}\{0, 1, 2, 3\} and its range is {5,6,7,8}\{5, 6, 7, 8\}. The inverse f1={(5,0),(6,1),(7,2),(8,3)}f^{-1} = \{(5, 0), (6, 1), (7, 2), (8, 3)\} has domain {5,6,7,8}\{5, 6, 7, 8\} and range {0,1,2,3}\{0, 1, 2, 3\}. Thus, the output values of the original function become the input values of the inverse, and vice versa.

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Updated 2026-05-25

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