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GT5. Index 2 Theorem and Dihedral Groups

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Published on Jan 13, 2012

Abstract Algebra: We state and prove the Index Two Theorem for finding normal subgroup and list several examples. These include S3, A4, and the symmetry groups for the regular n-gon, D_2n. We give several presentations of the latter groups and calculate the center.

U.Reddit course materials available at http://ureddit.com/class/23794/intro-... Master list at http://mathdoctorbob.org/UReddit.html

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