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_{[tex]\beta[/tex]}D

^{[tex]\alpha[/tex]}

mean? I came across it in General Relativity, so I think it's the set of all partial derivatives of the vector function, i.e.

[tex]\partial[/tex]

_{0}D

^{1}, [tex]\partial[/tex]

_{0}D

^{[tex]2[/tex]}

and so on... but I'm not entirely sure.