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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- Aug 28th 2007, 07:44 AMtttcomraderSubgroup of D4
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? - Aug 28th 2007, 07:55 AMThePerfectHacker
No there are only three.

Look here.