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Question about cadinality of sets

  1. May 2, 2010 #1
    i was confused about what the cardinality of the set {1,2,2,3,3,1,1,1} is?
    is it 8 or is it 3?
  2. jcsd
  3. May 2, 2010 #2
    Every element of a set is unique, therefore {1,2,2,3,3,1,1,1} is the same as {1,2,3}.
  4. May 3, 2010 #3
    There is an alternate concept of "multi-set" if you want to take repeats into account.
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