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Haag-Lopuszanski-Sohnius theorem
In theoretical physics, the Haag-Lopuszanski-Sohnius theorem shows that the possible symmetries of a consistent 4-dimensional quantum field theory do not only consist of internal symmetries and Poincaré symmetry, but can also include supersymmetry as a nontrivial extension of the Poincaré algebra. This significantly generalized the Coleman-Mandula theorem.
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