formula

$dz = \frac{\partial z}{\partial u}du + \frac{\partial z}{\partial v}dv$

...

$V(\Omega) = \int_{a}^{b} A(x)\,dx = \int_{a}^{b} \left( \int_{\varphi_{1}(x)}^{\varphi_{2}(x)}f(x,y)dy\right)\,dx$

$\oint_{C} Pdx + Qdy = \iint_{D} \left( \frac{\partial Q}{\partial x} - \frac{\partial P}{\partial y} \right)\,dxdy$

$\mathbb{R} \times \mathbb{R} \to \mathbb{R}$

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formula

原文：http://www.cnblogs.com/nettee/p/3599401.html