# Tensors: K-delta quick question

1. Nov 12, 2015

### sunrah

sorry solved

Last edited: Nov 12, 2015
2. Nov 12, 2015

### Geofleur

By $\eta$ are you referring to the Minkowski metric? Also, I assume that only indices that appear once raised and once lowered are being summed over, so that $\eta^{ii}$ is not to be summed, correct?

3. Nov 13, 2015

### sunrah

thanks, the issue was simply that sometimes I forget we are dealing with components and not whole vectors, matrices etc.

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