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Math Help - abelian

  1. #1
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    abelian

    may i know how do you prove that every subgroup of an abelian group is normal?

    thanks
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  2. #2
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    Quote Originally Posted by alexandrabel90 View Post
    may i know how do you prove that every subgroup of an abelian group is normal?
    Write out the definition of a normal subgroup.
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