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Corrections for proof that contrapositive statement is logically equivalent to original statement
1. please fix the technicality by Wkbj79 on 2007-08-23 18:08:38 (accepted)
2. technicality by Wkbj79 on 2007-06-28 15:49:37 (rejected)
3. entry type: not a definition by Wkbj79 on 2007-06-09 23:22:02 (accepted)
4. title should be: by Mathprof on 2006-09-26 11:55:37 (accepted)
5. portability by jac on 2005-02-28 01:21:46 (accepted)
6. Better title and TeX by igor on 2003-06-19 10:07:42 (accepted)

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