连续函数f(x)与｛f(x)｝~n的极值

Extreme Point of f(x) and f^n(x)

讨论了连续函数f（x）与｛f（x）｝~n有相同的极值点，并说明了定理的应用．

In this paper, we prove theorem of extreme point, about function of f(x) and fn(x), some applications of theorem are given.