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Math Help - Signature of permutation group

  1. #1
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    Signature of permutation group

    Dear masters

    Can I ask the question c?

    The answer says that it is not a subgroup as it does not have a identity ..
    But, I don't understand it..could you explain it?

    Thanks a lot.
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  2. #2
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    Re: Signature of permutation group

    The signature of identity is 1.
    Thanks from yanirose
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