How do I simplify $\delta_{ij} \delta^{jk}$?
I know that $\delta_{ij} \delta_{jk}=\delta_{ik}$, but what do I do if the there's a Kronecker Delta symbol with upper indices and one with lower indices?
2026-03-25 16:13:30.1774455210
How do I simplify $\delta_{ij} \delta^{jk}$?
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