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Corrections for clopen subset
1. eliminate unnecessary notation by Mathprof on 2006-10-16 17:34:47 (accepted)
2. elimnate unnecessary notation by Mathprof on 2006-10-16 12:06:11 (rejected)
3. no proof! by yark on 2006-10-07 17:11:25 (accepted)
4. synonym and proof by matte on 2004-10-04 13:42:42 (accepted)
5. Wording of proof by mathcam on 2004-10-01 01:03:04 (accepted)
6. connected components need not be clopen by yark on 2004-02-18 16:43:02 (accepted)
7. page images mode is broken by yark on 2004-01-20 09:42:23 (accepted)
8. _arbitrary_ unions and intersections? by antonio on 2003-02-07 23:57:25 (accepted) (1)

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