Abstract Algebra: We consider the class equation for the dihedral groups D_2n. Conjugacy classes are computed, and we verify the cardinality equation using centralizers. To finish, we consider the partitions for normal subgroups. U.Reddit course materials available at http://ureddit.com/class/23794/intro-to-group-theory Master list at http://mathdoctorbob.org/UReddit.html
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