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Corrections for subsets of countable sets are countable
1. subsets of countable sets are countable by zaslav on 2009-12-24 03:06:45 (pending)
2. minor issues by Wkbj79 on 2007-04-15 04:35:18 (accepted)
3. title by mathcam on 2006-03-14 09:16:34 (accepted)

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