The wikipedia article on Electromagnetic tensor has:(adsbygoogle = window.adsbygoogle || []).push({});

With the electromagnetic tensor, the equations for magnetism reduce to

[tex]F_{ \alpha \beta , \gamma } + F_{ \beta \gamma , \alpha } + F_{ \gamma \alpha , \beta } = 0. \,[/tex]

Can somebody point me to an online reference that explains the comma notation please (or explain directly if not time consuming).

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# Comma notation in tensor expression?

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