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How is the divergence in curvilinear coordinates of a second order mixed tensor defined? I mean, shall I contract the covariant or the contravariant index?? And for both cases which is the physical meaning?

[tex]\nabla_i N^i_j[/tex] or [tex]\nabla_j N^i_j [/tex]?

Thanks a lot,

Enzo

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# Divergence of mixed II-order tensors

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