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Definition

Inverse of a Function Defined by Ordered Pairs

If a function f(x)f(x) is one-to-one and composed of ordered pairs (x,y)(x, y), its inverse function, denoted as f1(x)f^{-1}(x), is the set of ordered pairs formed by reversing each pair to (y,x)(y, x). For instance, take the one-to-one function ff represented by the set {(0,5),(1,6),(2,7),(3,8)}\{(0, 5), (1, 6), (2, 7), (3, 8)\}. In this function, each input xx is increased by 55 to produce its corresponding output yy. To reverse or 'undo' this addition, 55 is subtracted from each yy-value to retrieve the original xx-value. Consequently, the inverse function is f1={(5,0),(6,1),(7,2),(8,3)}f^{-1} = \{(5, 0), (6, 1), (7, 2), (8, 3)\}. This demonstrates that the ordered pairs of ff and f1f^{-1} have their xx- and yy-coordinates explicitly swapped.

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Updated 2026-05-26

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