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Homework Help: Permutation group conjugates

  1. Mar 11, 2012 #1

    I just have a small question regarding the conjugation of permutation groups.

    Two permutations are conjugates iff they have the same cycle structure.

    However the conjugation permutation, which i'll call s can be any cycle structure. (s-1 a s = b) where a, b and conjugate permutations by s

    My question is, how can you find out how many conjugation permutations (s) are within a group which also conjugate a and b.

    So for example (1 4 2)(3 5) conjugates to (1 2 4)(3 5) under s = (2 4), how could you find the number of alternate s's in the group of permutations with 5 objects?

    Would it be like

    (1 4 2) (3 5) is the same as (2 1 4) (35) which gives a different conjugation permutation,
    another is

    (4 1 2)(3 5), then these two with (5 3) instead of ( 3 5),

    so that gives 6 different arrangements, and similarly (1 2 4) (35) has 6 different arrangements,

    and each arrangement would produce a different conjugation permutation (s)

    so altogether there would be 6x6=36 permutations have the property that
    s-1 a s = b ?

    Thanks in advance
  2. jcsd
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