Using the commutation relation for spin, namely that [Sx, Sy] = iSz (and cyclic permutations), prove that [Ŝ . X, Ŝ) = iŝ x X, (1.75) where X is a vector.
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Using the commutation relation for spin, namely that [Sx,Sy]=iSz (and cyclic premutations), prove that [S.X , S]=iS×X , where X is a vector.
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