題組內容
2 Let $U_k$ be a sequence of open bounded sets in $\mathbb{R}^n$. Prove or disprove:
a. (5) $\bigcup_{k=1}^{\infty} U_k$ is open.
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2 Let $U_k$ be a sequence of open bounded sets in $\mathbb{R}^n$. Prove or disprove:
a. (5) $\bigcup_{k=1}^{\infty} U_k$ is open.