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Power Set

  1. Jan 31, 2009 #1
    Why is P(A) called the power set of A?

    I don't know what to say about this.... can you explain this to me?
  2. jcsd
  3. Feb 1, 2009 #2
    This is just a guess, but if |A| denotes the cardinality of A, then |P(A)| = 2^A, which may have led to the name 'power set'.
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