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设函数f(x)的定义域为R,若存在常数m>0,使|f(x)|≤m|x|对一切实数x均成立,我们不妨称这类函数f(x)为F函数.这种函数有如下性质:
Let the domain of the function f(x) be R. If there is a constant m>0, let |f(x)| ≤m|x| be true for all real numbers x. Let us call this type of function f(x) as F function. This function has the following properties: