I am studying fluid mechanics from Landau and Lifshitz and I'm trying to prove the equation $\begin{align*}\\ -\oint \; p\,df = -\int\, grad\,p\,dV\end{align*}\\$ (topic on Euler's equation page 2) which I am running into trouble proving, I was requesting if someone can provide a hint or proof for this equation
2026-03-25 09:33:44.1774431224
Euler's equation
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