I'm trying to find all of the subgroups in $\displaystyle D_{4}$ of the order 4. So far I can only get the subgroup set consist of $\displaystyle R_{0}, R_{90}, R_{180}, R_{270}$ Shouldn't there be two more?
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Originally Posted by tttcomrader I'm trying to find all of the subgroups in $\displaystyle D_{4}$ of the order 4. So far I can only get the subgroup set consist of $\displaystyle R_{0}, R_{90}, R_{180}, R_{270}$ Shouldn't there be two more? No there are only three. Look here.
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