lets say we have a covariant 4-gradient ∂[itex]_{μ}[/itex] = (1/c ∂/∂t, ∇). How do I actually apply this to a function, say x^2 where x is an arbitrary 4-vector (ct,-x,-y,-z)?(adsbygoogle = window.adsbygoogle || []).push({});

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# Using the 4-gradient

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