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Math Help - Show H is not normal in A_4

  1. #1
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    Question Show H is not normal in A_4

    Let H={(1), (12)(34)} in A_4. Show H is not normal in A_4
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  2. #2
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    Sep 2008
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    Show that xH does not equal Hx for some x in A_4.

    Example, (123)H does not equal H(123)
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