(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

what does the expression [tex]\delta_{ii}[/tex] mean?

2. Relevant equations

[tex]\delta_{ij}=1[/tex] if i = j and 0 otherwise

3. The attempt at a solution

What i'm not sure about is if both indices are in the subscript does this mean i can only use it on a term with a subscript or can it also act on a term with a superscript? what is the difference between this and [tex]\delta^{j}_{i}[/tex]? and why can't it be used for index replacement?

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# Homework Help: Kronecker delta in index notation

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