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Math Help - Analysis

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    Analysis

    Is there an example of a proper subset of R whose closure is R?
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  2. #2
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    Quote Originally Posted by izzydoesit View Post
    Is there an example of a proper subset of R whose closure is R?
    There are many such sets.
    In fact any dense subset of \mathbb{R} has that property.
    A set is dense if between any two points there is a point of the set.
    Does that give you a big hint.
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