4-gradient

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From the use of the Minkowski metric, converting between contravariant and covariant


xμημμxμ


Where we have already defined the covariant term,

xμ=[x0x1x2x3]

and the contravariant term

xμ=[x0x1x2x3]


Following the rules of matrix multiplication this implies that the derivative with respect to a contravariant coordinate transforms as a covariant 4-vector, and the derivative with respect to a covariant coordinate transforms as a contravariant vector.

μ=xμ


μ[txyz]=[x0x1x2x3]


μ=xμ


μxμ=[x0x1x2x3]