I'm reading,(adsbygoogle = window.adsbygoogle || []).push({}); , by Robert M. Wald. On page 39 he has the following notation:General Relativity

[tex]

\displaystyle{

{\rm R}_{{\rm [abc]}}^{\,\,\,\,\,\,\,\,\,\,\,\,{\rm d}} = 0

}

[/tex]

and

[tex]

\displaystyle{

\nabla _{{\rm [a}} {\rm R}_{{\rm bc]d}}^{\,\,\,\,\,\,\,\,\,\,{\rm e}} = 0

}

[/tex]

What do the square brakets [ ] mean? How can the subscript of the [tex]\nabla[/tex] be included in these brakets? I've not seen this notation in the other books I have, so I could use a little help.

Thanks.

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# Notation of General Relativity

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