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Math Help - Table of marks

  1. #1
    Newbie
    Joined
    Dec 2010
    Posts
    6

    Table of marks

    Hi all,

    I'm trying to figure out how the table of marks is calculated. For those of you unfarmiliar with it it is defined on the wikipedia page here (under the section marks), the important bit being:

    For each pair of subgroups H,K \le G define
    <br />
m(K, H) = \left|[G/K]^H\right| = \# \left\{ gK \in G/K \mid HgK=gK \right\}.<br />
    Then finding the groups subgroups, and then putting them into conjugacy classes of subgroups, we get a string of representative subgroups G_1, \dots, G_N where G_1 is the trivial group and G_N is the whole group. Then we can make a N x N matrix where the i,j th entry is m(G_i, G_j) .

    So for S_3:
     <br /> <br />
\begin{array}{ccccc} <br />
S_3 &1 &Z_2& Z_3& S_3\\ <br />
S_3/1 & 6 & . & . & . \\<br />
S_3/Z_2 & 3 & 1 & . & . \\<br />
S_3/Z_3 & 2 & 0 & 2 & . \\ <br />
S_3/S_3 & 1 & 1 & 1 & 1 <br />
\end{array} <br />


    I can calculate the top left entry obviously, and the bottom row, but I literally have no idea how to calculate the others. If someone could talk me through how to calculate another more difficult entry, that is a difficult m(G_i, G_j) , it would be of great help.

    Many thanks in advance for any help, and have a merry christmas everyone!
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  2. #2
    Newbie
    Joined
    Dec 2010
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    Sorry wikipedia page here: Burnside ring - Wikipedia, the free encyclopedia , didnt seem to link correctly.
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