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I read in Cheng and Li's book "Gauge theory of elementary particle physics" Ch 11, specifically : Eq. (11.46) that the hypercharge commutes with the SU(2) generators, i.e.,

##[Q-T_3,T_i]=0##, I'd like to understand what that mean and how this could be proved ?

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# I Commutation relation of hypercharge and SU(2) generators

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