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Corrections for minus one times an element is the additive inverse in a ring
1. unity by pahio on 2005-11-12 12:29:32 (accepted)
2. Contains own proof by pbruin on 2004-03-25 11:06:47 (accepted)
3. show also a(-1) is -a by archibal on 2004-03-09 14:53:33 (accepted)

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