HALP! Question is in the picture. My problem is: I am not sure about j as in, will that have values 1 to 3 also? I think all I have to do is do all with i,j, and k having values 1,2 and 3. Can you give me one example for i=1, j=2 and k=3?

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what class is this from?

Theoretical mechanics. It's the vectors and scalars section in the beginning.

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