Let $(\mathcal{M}, d)$ be a metric space.
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If $E \subseteq M$ is not compact, then no open cover of $E$ has a finite subcover.
- True
- False
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If $E \subseteq M$ is not compact, then no infinite open cover of $E$ has a finite subcover.
- True
- False
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Suppose $E \subset M$, and let $\mathcal{U}$ be an open cover of $E$.
Then $\mathcal{U}$ has a supercover which admits a finite subcover, i.e., there is an open cover $\mathcal{V}$ with $\mathcal{U} \subseteq \mathcal{V}$ so that $\mathcal{V}$ has a finite subcover.
- True
- True iff $E$ is compact
- False
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Any set with no limit points is closed.
- True
- False
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Any bounded set with no limit points is compact.
- True
- False