高频公式表

名书镇贴

东西慢慢加进来好了，顺便看看公式渲染的情况。

(\nabla u)\_r = \frac{\partial u}{\partial r},\ (\nabla u)\_{\theta} = \frac 1 r \frac{\partial u}{\partial \theta},\ (\nabla u)\_z = \frac{\partial u}{\partial z}

\nabla \cdot \mathbf{A} = \frac 1 r \frac{\partial (r A_r)}{\partial r} + \frac 1 r \frac{\partial A_{\theta}}{\partial \theta} + \frac{\partial A_z}{\partial z}

\nabla \times \mathbf{A} = \frac 1 r \left[\frac{\partial A_z}{\partial \theta} - \frac{\partial (rA_{\theta})}{\partial z}\right]\mathbf{e_r} + \left[\frac{\partial A_r}{\partial z} - \frac{\partial A_z}{\partial r}\right]\mathbf{e_{\theta}} + \frac 1 r \left[\frac{\partial (rA_{\theta})}{\partial r} - \frac{\partial A_r}{\partial \theta}\right]\mathbf{e_z}

(\nabla u)\_r = \frac{\partial u}{\partial r},\ (\nabla u)\_{\theta} = \frac 1 r \frac{\partial u}{\partial \theta},\ (\nabla u)\_{\phi} = \frac{1}{r \sin \theta} \frac{\partial u}{\partial \phi}

\nabla \cdot \mathbf{A} = \frac{1}{r^2} \frac{\partial (r^2 A_r)}{\partial r} + \frac{1}{r \sin \theta} \frac{\partial (\sin \theta A_{\theta})}{\partial \theta} + \frac{1}{r \sin \theta} \frac{\partial A_{\phi}}{\partial \phi}

\nabla \times \mathbf{A} = \frac{1}{r \sin \theta} \left[\frac{\partial (\sin \theta A_{\phi})}{\partial \theta} - \frac{\partial A_{\theta}}{\partial \phi}\right]\mathbf{e_r} + \frac 1 r \left[\frac{1}{\sin \theta}\frac{\partial A_r}{\partial \phi} - \frac{\partial (r A_{\phi})}{\partial r}\right]\mathbf{e_{\theta}} + \frac 1 r \left[\frac{\partial (rA_{\theta})}{\partial r} - \frac{\partial A_r}{\partial \theta}\right]\mathbf{e_{\phi}}