antilysin 发表于 2006-11-14 12:36

function problem

is there a function defined on R\{0} (the nonzero real numbers), for which f(f(x))=-1/x?<br/>show an example, or prove that there is no such function.<br/>

xjzkp 发表于 2006-12-1 13:58

<p>什么东西啊</p>

qazxcv11 发表于 2007-1-10 22:45

<p>什么东西啊</p>
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