To find all subgroups you use the fact that by Legrange theorem and subgroup will divide the order of the group, so for the dihedral group D4 our subgroups are of order 1,2, and 4. I am unsure how to tell whether or not these groups will be normal or not.(adsbygoogle = window.adsbygoogle || []).push({});

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# Subgroups of dihedral group and determining if normal

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