希望你们大致记得，这是关于多元函数及其偏导的。
Well, hopefully you kind of vaguely remember that it was about functions of several variables and their partial derivatives.
要寻找等于，减去a的偏导的函数，我们考虑。
A a function of a that looks like the sum of a minus something times the derivative, with respect to that something.
可以想到哪个函数关于x的偏导是，关于y的偏导是x吗？
y Can we think of a function whose derivative with respect to x is y, and derivative with respect to y is x?
化学势，从基本方程上说，就是A对N的偏导，因此对A取N偏导，因此化学势也能，用正则配分函数表示。
The chemical potential from the fundamental equation up here is the derivative of a with respect to the number of particles.
而一个偏微分方程就是，函数各个偏导之间的联系，看看。
And a partial differential equation is some relation between its partial derivatives. Let me see.
一次二阶矩法是目前求解结构可靠性分析的主要计算方法之一，该方法要求功能函数对随机变量的偏导运算。
Reliability analysis using First Order Second Moment (FOSM) is important for structural probability design, in which process demands the derivative operation.
一次二阶矩法是目前求解结构可靠性分析的主要计算方法之一，该方法要求功能函数对随机变量的偏导运算。
Reliability analysis using First Order Second Moment (FOSM) is important for structural probability design, in which process demands the derivative operation.
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