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Corrections for proof of Zermelo's well-ordering theorem
1. Pre-image definition by mathmenot on 2007-03-08 23:14:48 (accepted)
2. Problems causing the 'proof' to fail. by cryo on 2002-09-26 19:30:30 (accepted)
3. Union of chain of well-orderings does not preserve well-ordering in general by nomad on 2002-09-14 05:12:56 (accepted)

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