你可以看到 f > g 但 f 不 >> g 因为你可以选择 c == 0.1 然后 cf 永远不会 > > g。
但是：
f = n^2
g = 2n
您可以看到，对于足够大的 n，一开始是 g>f，但最终是 f>g，无论您的 n 有多小>c，最终 cf 将变得大于 g。因此f>>g。
An example:
f = 2n
g = n
You can see that f > g but f not >> g because you can choose c == 0.1 and then cf will never be > g.
However:
f = n^2
g = 2n
You can see that at first g>f but eventually f>g for large enough n and no matter how small you make c, eventually cf will become larger than g. Therefore f>>g.
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>可以读取大于 where>>可以读作比差值大得多的近似值，例如
，如果
a>>b则a+b是近似值与a相同，您不能判断是否只有a>b成立。>can be read greater than where>>can be read as much greater thanDifference is in approximations for instance
if
a>>bthena+bis approximetly same asa, where you can not say if onlya>bholds.一个例子：
你可以看到
f > g但f 不 >> g因为你可以选择c == 0.1然后cf 永远不会 > > g。但是：
您可以看到，对于足够大的
n，一开始是g>f，但最终是f>g，无论您的n 有多小>c，最终cf将变得大于g。因此f>>g。An example:
You can see that
f > gbutf not >> gbecause you can choosec == 0.1and thencf will never be > g.However:
You can see that at first
g>fbut eventuallyf>gfor large enoughnand no matter how small you makec, eventuallycfwill become larger thang. Thereforef>>g.