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I'm just reading through some vector calculus notes and it begins to assume knowledge of the notation $\delta_{ij}$ and $\epsilon_{ijk}$ in reference to tensors, but I am not familiar with this. It uses them as if they are constant and well-defined.

If someone could just explain this I would appreciate it. Thank you.

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see here: https://en.wikipedia.org/wiki/Kronecker_delta

and here: https://en.wikipedia.org/wiki/Levi-Civita_symbol

these are well known usefull shorthands.

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  • $\begingroup$ While it's unlikely that wikipedia will go down any time soon, we prefer answers on this site that are self-contained, and only use links as supplement. $\endgroup$ – Arthur Sep 22 '16 at 21:45

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