# limit superior and limit inferior

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• February 17th 2010, 06:35 PM
summerset353
limit superior and limit inferior
I dont understand limit superior and limit inferior. I know what the definitions are but I would not know how to apply it in an example since my teacher did not explain how to go about that. How would I find the limit superior and limit inferior of {(n/3)-[n/3]}?
• February 17th 2010, 07:28 PM
Drexel28
Quote:

Originally Posted by summerset353
I dont understand limit superior and limit inferior. I know what the definitions are but I would not know how to apply it in an example since my teacher did not explain how to go about that. How would I find the limit superior and limit inferior of {(n/3)-[n/3]}?

I'll show you one part. You show me another. I assume that this is $a_n=\frac{n}{3}-\left\lfloor \frac{n}{3}\right\rfloor$. Clearly, we have that $a_n\geqslant 0$ and so $\liminf\text{ }a_n\geqslant 0$ but considering that $a_{3n}=0$ we see that $\liminf\text{ }a_n=0$.