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How to proof this subject?

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Please see mathoverflow.net/howtoask – Yemon Choi Sep 25 '12 at 6:40
    
Also, why do you have tags related to semigroups – Yemon Choi Sep 25 '12 at 6:41
    
See page 9 of "Finite permutation groups" by H. Wielandt. – Benjamin Dickman Sep 25 '12 at 6:48

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