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For $\{A_n\}$ a nested collection of open intervals $(a_n,b_n)$, must $\bigcap_{n=1}^\infty A_n$ be nonempty? [closed]

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Let $\{A_n\}$ be a nested collection of open intervals $(a_n,b_n)$. Must the intersection $\bigcap_{n=1}^\infty A_n$ be nonempty?

Briefly explain why is nonempty, or give an example where it is empty.


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