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Math Help - Cardinality of a Set

  1. #1
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    Cardinality of a Set

    Im looking for the cardinality of a Set where X is an element of the Real Numbers such that lxl = -1..... what's this mean ?!
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  2. #2
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    HINT: There is no real number such that |x|=-1
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  3. #3
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    Quote Originally Posted by Plato View Post
    HINT: There is no real number such that |x|=-1


    So, Would it just be the empty Set ?
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  4. #4
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    Well, YES.
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