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    5. The set of rational numbers, $\mathbb{Q}$

    The set of rational numbers, $\mathbb{Q}$

    Example · High school

    Terms

    TermThis exampleWhy
    paracompact ✓
    measure_zero ✓
    dense_set ✓
    countable ✓
    compact ✗
    sequentially_compact ✗
    locally_compact ✗
    nowhere_dense ✗
    uncountable ✗

    All examples · All distinctions · All definitions

    Collection: Examples

    Updated: November 4, 2026

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