Chapter 16: Problem 30
If \(\delta_{j i}\) denotes the Kronecker delta symbol (16.115) and a is a vector with components \(a_{j}\) \((j=1,2,3),\) prove that \(\sum_{j} \delta_{j i} a_{j}=a_{i} .\) In the same way, show that \(\sum_{j} \delta_{j i} \partial_{j}=\partial_{i},\) a result we used in proving the important identity (16.116).
Short Answer
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Key Concepts
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