I am reading texts on QFT and they place a lot of emphasis on finding irreducible representations of the Lorentz/Poincare Group. I also recall some level of discussion from non-relativistic quantum mechanics, and I've also read up a bit on them in texts on representation theory. I am wondering however why they are particularly significant to physicists. If anyone could clarify this for me it would be greatly appreciated.
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$\begingroup$ Is the question about the theory of representation, or about the irreducible representation of group theory ? $\endgroup$– FraSchelleNov 29, 2017 at 9:45
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$\begingroup$ An irreducible representation indicates that the quantum system is elementary; please see the following question: physics.stackexchange.com/questions/73593/… $\endgroup$– David Bar MosheDec 3, 2017 at 15:21
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