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Question on tensor notation in group theory 
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#1
Apr1012, 10:25 AM

P: 328

in the appendix on Group Theory in Zee's book there is a discussion of commutations for SO(3)
two questions  does [[itex]J^{ij},J^{lk}] = J^{ij}*J^{lk}J^{lk}*J^{ij}[/itex]? and there is an expression in the appendix that the commutator equals i([itex]\delta^{ik}J^{jl} ...[/itex] i don't understand the why you are multiplying the matrix by the kronecker delta with different upstairs indexes, is not it simply an identity? 


#2
May1712, 01:50 PM

P: 328

bumping this  this apparantly is some notation I don't understand, the Wiki entry on Special Unitary groups has this as well
I don't get the significance of the kronecker deltas with the different indexes 


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