If given δ_ijδ_kk what would the expansion of that be? I thought it was nine but have been told that is incorrect. I know that i=j =1 else zero so I thought that the δ_kk would equal 3 times 3 from the expansion of δ_ij but that isn't the answer(adsbygoogle = window.adsbygoogle || []).push({});

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# Kronecker delta expansion

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