in the appendix on Group Theory in Zee's book there is a discussion of commutations for SO(3)(adsbygoogle = window.adsbygoogle || []).push({});

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?

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# Question on tensor notation in group theory

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