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## Main Question or Discussion Point

How can a curl of 4-vector or 6-vector be writen? Let's say that we have a 4-vector A

how can we write in details the ∇×A

Can we follow the same procedure for 6-vector?

^{4}=(a_{1},a_{2},a_{3},a_{4})how can we write in details the ∇×A

^{4}Can we follow the same procedure for 6-vector?