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Corrections for the kernel of a group homomorphism is a normal subgroup
1. contains own proof by CWoo on 2007-07-27 15:13:01 (accepted)
2. group operation by Wkbj79 on 2007-06-29 22:09:19 (accepted)
3. Linking by rm50 on 2007-06-29 19:51:56 (accepted)

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