I have a question regarding the attached file. How do you get those indicies when you multiply the kronecker deltas with A, B, and C? For instance, C - subscript(adsbygoogle = window.adsbygoogle || []).push({}); mremains the same on the left side of the expression, but then becomes C subscription the right side.

How does this logically work out? What are the rules for these operations?

Thanks.

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# Question on Elementary Index Notation

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