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So, the representation of this is simple:

$${\{x \in \mathbb R | -1 \le x \le 1/n\}}$$

But I'm not sure what I need to prove. This is all of the information that I have. In class, a different problem, we were told what the set was equal to, and had to prove/disprove that. So, should I prove $\cup_{n = 1}^\infty [-1, 1/n] = [-1, 1]$?

Or is there something else that I need to do?

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    In your simple representation ${\{x \in \mathbb R | -1 \le x \le 1/n\}}$, what is the value of $n$?2012-10-18

2 Answers 2