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Math Amateur
Feb6-12, 04:04 AM
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P: 124
Oh .... OK that explains it!

Must go back and check the example - I thought it checked out for what I thought was intuitive - D&F give a process for determining the matrices.

Just another question I am still struggling with ...

On page 842 of D&F - see attachement - we are told to make V into an FG-module by considering the action of a group ring element on an element of V.

However when we come to Example (3) on page 844 (see attachement) we find D&F talking about the action of Sn on V rather than FSn on V ... until we come to the specific example of 3-dimensional space where D&F resume talking about the group ring FS3

Are you able to clarify this