The four-dimensional version of the gradient, encountered frequently in general relativity and special relativity, is del _μ = [1/c d/(dt) d/(dx) d/(dy) d/(dz)], which can be written ( del ^μ)^2 congruent square ^2, where square ^2 is the d'Alembertian.
d'Alembertian | gradient | tensor | vector
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