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Subgroup structure of dihedral groups

5 bytes added, 13:41, 2 September 2009
The subgroup \langle a \rangle
* [[Commutator subgroup centralizes cyclic normal subgroup]]: In particular, the cyclic part in a dihedral group is contained in the [[centralizer of commutator subgroup]] for all <math>n</math>. The cases <math>n = 2,4</math> need to be excluded because these are the only cases where the centralizer of commutator subgroup is ''bigger'', i.e., the whole group.
* [[Abelian subgroup equals centralizer of commutator subgroup in generalized dihedral group unless it is a 2-group of rank exponent at most twofour]]
===Odd versus even <math>n</math>===
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