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I don't get how one goes from 3.6.17 to 3.6.18 on Page 80 (Galilean invariance) regarding the zeroing of boost generator commutators. I do get that this is a special case of the Lorentz invariance (which I understand), but this particular step eludes me.

Thanks for your help.

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# Weinberg Lectures on QM (2013 ed.), Equation 3.6.18

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