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I have a doubt because I don't find the general definition of the nabla operator in order to solve my matter.

I am working with dyadic analysis and I have to prove that

[tex]\nabla^{2}F = \nabla \nabla \bullet F[/tex]

where F is a symmetric dyadic function.

My problem is when I have to get [tex]\nabla^{2}F[/tex]

because I don't know how to calculate the gradient of a dyadic. I know the definition of the gradient of a vector what results in a dyadic, but no idea about the general definition of the gradient in cartesian coordinates for whatever order of cartesian tensors.

I 'd be very thankful for a little of help.

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# About tensorial calculus

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