MathOverflow is a question and answer site for professional mathematicians. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

How to proof this subject?

share|cite|improve this question
Please see – 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

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.