Atendendo a algumas respostas apreciativas e inúmeras ignorativas, aqui está......

08 abril 2011

Div, grad, curl are not dead!

Let a be a vector field on a Riemannian manifold with metric < , > and connection ∇. Then curl a is a antisymmetric 2-form defined by:

curl a (X,Y) = <∇_Y a, X> - <∇_X a, Y>

There even exists a Helmholtz decomposition of a vector field into its divergence-free and curl-free parts. So maybe Burke was wrong, and div, grad, and curl still live!
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