可以通过隐函数微分法和乘法法则得到，或者直接,把关于x，y，z的偏微分放进来。
You can get this either by implicit differentiation and the product rule, or you could get this just by putting here, here,and here the partial derivatives of this with respect to x, y, and z.
本文主要用首次积分法构造一阶拟线性偏微分方程始值问题的解。
The fist integration is mainly used tO form the initial value solution of fist order quasi-linear partial differential equation.
本文采用有限差分法求解偏微分方程(即定价模型)的数值解。
In solving partial differential equation (i. e. pricing model), the author adopted the finite difference method to get its numerical solution.
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