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Ok, I have a stupid question on pauli matrices here but it is bugging me. In a book i'm reading it gives the equation [tex][\sigma_i , \sigma_j] = 2 I \epsilon_{i,j,k} \sigma_k [/tex] , I understand how it works and everything but I do have a question, when you have k=i/j and i!=j (like 2,1,2) you get a non zero commutator and yet [tex]\epsilon[/tex] gives you 0. What am I missing here? Thanks

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