# Subgroup of D4

• August 28th 2007, 07:44 AM
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?
• August 28th 2007, 07:55 AM
ThePerfectHacker
Quote:

Originally Posted by tttcomrader
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.