标题: function problem [打印本页] 作者: antilysin 时间: 2006-11-14 12:36 标题: function problem is there a function defined on R\{0} (the nonzero real numbers), for which f(f(x))=-1/x? show an example, or prove that there is no such function. 作者: xjzkp 时间: 2006-12-1 13:58