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Math Help - Subgroup of D4

  1. #1
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    Subgroup of D4

    I'm trying to find all of the subgroups in D_{4} of the order 4.

    So far I can only get the subgroup set consist of R_{0}, R_{90}, R_{180}, R_{270}

    Shouldn't there be two more?
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  2. #2
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    Quote Originally Posted by tttcomrader View Post
    I'm trying to find all of the subgroups in D_{4} of the order 4.

    So far I can only get the subgroup set consist of R_{0}, R_{90}, R_{180}, R_{270}

    Shouldn't there be two more?
    No there are only three.
    Look here.
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