Hi there, I need a help on one of the commutation proof,(adsbygoogle = window.adsbygoogle || []).push({});

the question is, show that [Lx,L^2]=0 cyclic where L=l1+l2

The expression simplifies to [Lx,l1l2]+[Lx,l2l1] but I'm not sure if they are 0.

Thanks for your help :D

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# Commutation proof

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