Divergence and Gradient Theorems
$ \int_0^1\int_0^4\int_{-1}^7\nabla\phi {dV} = \frac{\partial u}{\partial x}\hat{e}_x $
$ \int\int\int_{\partial \Omega} {\mathbb R} $
$ \int_0^1\int_0^4\int_{-1}^7\nabla\phi {dV} = \frac{\partial u}{\partial x}\hat{e}_x $
$ \int\int\int_{\partial \Omega} {\mathbb R} $