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Nov 7, 2020 at 11:19 history edited Qmechanic CC BY-SA 4.0
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Jan 30, 2018 at 16:37 comment added David Bar Moshe This is a very good question. It deserves to be up-voted rather than down-voted. It is true that we use $SU(2)$ representation matrices for the integer as well as the half integer spins. But for the integer spins (and only the integer ones), the $SU(2)$ representation matrices are unitarily equivalent to $SO(3)$ matrices, i.e.,$ M_{SU(2)} = V M_{SO(3)} V^{-1}$, where $V$ is unitary. $ M_{SO(3)}$ is a representation of $SO(3)$, in particular all of its matrix elements are real.
Jan 16, 2018 at 19:29 answer added Qmechanic timeline score: 1
Jan 16, 2018 at 19:04 history asked Lenz CC BY-SA 3.0