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Homework Statement
div(øu) = ødivu + ugradø
Homework Equations
divergence of scalar field = f,ii
divergence of vector field = ui,i
The Attempt at a Solution
I've heard this is a simple proof, but this is my first one of 8 or so proofs I need to complete for homework, and I'm really not sure where to start. I know that div v = ∇ . v, but that's as far as I've gotten. We need to use Index Notation. Thoughts on where to start?