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1st Isomorphism thm for dihedral gps
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[QUOTE="fresh_42, post: 6062738, member: 572553"] We have ##S^2=1## so no higher powers as ##1## are possible for ##S##. Then we have ##SRS=R^{-1}## which is ##SR=R^{-1}S^{-1}=R^{-1}S## so we can always change the order such that ##S## will end up on one side of ##R## to the expense of powers of ##R##, which we are not interested in. We can allow integers, so it doesn't matter if it changes. [/QUOTE]
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1st Isomorphism thm for dihedral gps
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