是否有f（n）和g（n）之类的函数？
Are there any functions such as f(n) and g(n) that both;
f(n) != O(g(n)) and g(n) != O(f(n)).是否有满足上述要求的功能？
Are there any functions that fulfills the requirements at the above?
推荐答案f(n)=n and g(n)=n^(1 + sin(x)).
f（n）不是O（g（n））并且g（n）不是O （f（n））。
f(n) is not O(g(n)) and g(n) is not O(f(n)).
引用 c2/cgi / wiki？BigOh