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Ordinals and transitive sets

  1. Jun 5, 2012 #1
    I continue with a questions regarding proofs in set theory.. :)

    Halmos just writes that every ordinal number is a transitive set but doesnt prove it. Is there any simple proof of this?
  2. jcsd
  3. Jun 5, 2012 #2
    Well, how did you define ordinals??
  4. Jun 5, 2012 #3
    Haha, that was enough. :) Realized my mistake.
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