# Covarient maxwell

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1. Feb 23, 2015

### jennyjones

can some tell me why the second line follows from the first in the attachment

thank you

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• ###### Schermafbeelding 2015-02-23 om 16.29.21.png
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2. Feb 23, 2015

### Orodruin

Staff Emeritus
It doesn't. The two sides of the equation have different free indices.

3. Feb 23, 2015

### jennyjones

thanx!

4. Feb 23, 2015

### Matterwave

For some reason they have mad a swap $\mu\leftrightarrow\nu$ in the second line...and also switch the order of the partial derivatives.