Representations of the Lorentz group

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Can anyone recommend some litterature on representations of the Lorentz group. I'm reading about the dirac equation and there the spinor representation is used, but I would very much like to get a deeper understanding on what is going on.
 
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This is a very broad subeject and even whole books have been written about it. Indeed, Sam gave there a brilliant summary of results and if you're interested in more without delving into hard mathematics, then the book by Wu Ki Tung on group theory with applications in physics would be an appropriate choice.
 

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