Inverse function

A function f and its inverse f −1. Because f maps a to 3, the inverse f −1 maps 3 back to a.

If f maps X to Y, then f −1 maps Y back to X.

The graphs of y = f(x) and y = f −1(x). The dotted line is y = x.

In mathematics, if a function $f(x)=y$ is injective, exactly one function $g(y)$ will exist such that $g(y)=x$ , otherwise no such function will exist. The function $g(y)$ is called the inverse function of $f(x)$ because it "reverses" $f(x)$ ; that is to say $g(f(x)) = x$ .

单词	Inverse process
释义	Inverse process 英语百科 Inverse function In mathematics, if a function $f(x)=y$ is injective, exactly one function $g(y)$ will exist such that $g(y)=x$ , otherwise no such function will exist. The function $g(y)$ is called the inverse function of $f(x)$ because it "reverses" $f(x)$ ; that is to say $g(f(x)) = x$ .
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Inverse process

Inverse function