Inverse function

Written by michaelcohen, et al. last updated

If a function is the inverse of a function , then undoes , and undoes . In other words, and . An inverse function takes as its domain the range of the original function, and the range of the inverse function is the domain of the original. To put that another way, if maps onto , then maps back onto . To indicate the inverse of a function , we write .

Examples

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