Abstract
It is shown that the point spectrum of internal symmetries is always symmetric. It is a group provided the intersection of all local subalgebras is trivial.
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Jadczyk, A.Z. On the spectrum of internal symmetries in the algebraic quantum field theory. Commun.Math. Phys. 12, 58–63 (1969). https://doi.org/10.1007/BF01646435
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DOI: https://doi.org/10.1007/BF01646435