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nabla=(d/dx, d/dy)

and

Ax =

( C D)

( E F),

Ay =

( G H)

( I J)

(it's a 2x2x2 cube).

Index notation:

(nabla)_i = d/dx_i

and elements of A are A_ijk

How do I contract it properly to calculate

Divergence of A (Nabla inner product A)?

Thanks a lot!!