# Math Help - Interval Problems

1. ## Interval Problems

Can someone help me with these two problems? I can not think anything to do...

2. ## Re: Interval Problems

What difficulty are you having? These problems ask you to give examples. Do you understand what they are asking?

3. ## Re: Interval Problems

Originally Posted by ManosG
Can someone help me with these two problems? I can not think anything to do...

Let us agree that $n\in\mathbb{Z}^+$.

For #1 let ${A_n} = \left( {0,\tfrac{1}{n}} \right)$

For #2 let ${A_n} = \left( { - \tfrac{1}{n},\tfrac{1}{n}} \right)$

4. ## Re: Interval Problems

I have thought the examples Plato wrote but I have difficulty in proving that they have the stated property.