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I am currently studying representation theory and am struggling with the concepts which relate modules and representations. The specific question I am looking at right now is this:

FS_4 Representation

but while specific help would obviously be greatly appreciated, I could really do with Idiot's Help to start me off getting my head around the general theory. I'm currently feeling very stupid.

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    Are you familiar with irreducible representations (aka simple $FS_4$-module in this case), and that you can use characters to check that something is irreducible?2012-11-11

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