如果f = O(g),e ^ f = O(e ^ g)? [英] If f = O(g), is e^f = O(e^g)?

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问题描述

如果f = O(g)e^f = O(e^g)?

我很难弄清楚上述问题.一个例子将是受欢迎的.另外,如果您使用l'Hôpital法则,请展示如何进行微分.

I'm having difficultly figuring out the above question. An example would be welcome. Also, if you use l'Hôpital's rule, please show how you do differentiation.

推荐答案

该语句是错误的,例如2n = O(n),但是exp(2n)!= O(exp(n)). (对于n足够大,后者意味着exp(2n)<= C exp(n),即exp(n)<= C,这是不正确的.)

This statement is wrong, for example 2n = O(n), but exp(2n) != O(exp(n)). (The latter would mean exp(2n) <= C exp(n) for sufficiently large n, i.e. exp(n) <= C which is not true.)

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