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The set containing the empty set?

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    What is S = \left\{\left\{\right\}\right\}? How is it different from the empty set?
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    (Original post by Elysǐum)
    What is S = \left\{\left\{\right\}\right\}? How is it different from the empty set?
    It has one element, the empty set has none.

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Updated: July 13, 2012
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