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## Main Question or Discussion Point

How exactly do you derive it without using tensors? You use Newton's frictional law on a 3d block of fluid, instead of just on fluid surfaces, but I can't 100% visualize how. So is there any simple derivation, or at least explanation?

[tex]\mu \nabla ^2 \vec{V}[/tex]

[tex]\mu \nabla ^2 \vec{V}[/tex]

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