Angular momentum, spin etc — UPSC Physics Optional IFoS 2017 Paper II
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(i) \hat{L} \times \hat{L} = i \hbar \hat{L}
(ii) [\hat{L}_+, \hat{L}_-] = 2\hbar \hat{L}_z
(iii) \hat{\sigma}_x \hat{\sigma}_y \hat{\sigma}_z = -i
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