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## Main Question or Discussion Point

What is meant by things like:

[tex]R_{[abc]}[/tex]

and also things like:

[tex]\nabla_{[a\nabla_b]}[/tex]

Where you have square brackets in the subscript? Thx

[tex]R_{[abc]}[/tex]

and also things like:

[tex]\nabla_{[a\nabla_b]}[/tex]

Where you have square brackets in the subscript? Thx