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Corrections for PID
1. that that by Wkbj79 on 2007-05-18 02:38:29 (accepted)
2. add a link by Wkbj79 on 2007-04-15 19:02:55 (accepted)
3. regarding subrings by Wkbj79 on 2006-10-16 06:09:15 (accepted)
4. extra symbol by Mathprof on 2006-06-19 15:30:14 (accepted)
5. The link to "ideal" from PID is incorrect by unicycle on 2005-01-30 02:47:13 (accepted)

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