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Corrections for union
1. diagram by CWoo on 2008-03-19 05:46:57 (accepted)
2. commutativity by pahio on 2008-01-16 16:00:29 (accepted)
3. union properties by kfgauss70 on 2008-01-02 09:31:51 (accepted)
4. alternative characterization, empty set, examples by Wkbj79 on 2007-10-29 18:02:51 (accepted)
5. arbitrary union by drini on 2005-05-11 00:59:08 (accepted)
6. multiple sets by matte on 2005-04-30 10:29:36 (accepted)

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