证明 f(n) + d(n)= O(g(n)+ h(n))

Prove f(n) + d(n)= O(g(n)+ h(n))

If f(n) is Ο(g(n)) and d(n) is Ο(h(n)), then prove that f(n) + d(n)= O(g(n)+ h(n))

我无法提出正式证明。

这是我目前的情况:

f(n)=O(g(n)) and d(n)=O(h(n)) so, O(g(n)) + O(h(n)) = O(g(n)+ h(n))

但是我不确定这个,因为它看起来很简单。

感谢任何帮助。

EDIT: i must prove this, I cant prove this by saying an example, I have to solve it as a proof by using a C constant I think or some other way..

正式地,通过使用 Big-O-Notation 的定义,它可以像 Hans Hyttel 那样完成 here

证明: