这个微分方程的，解法是什么呢？
我们不再讨论微分方程序。
这是一个，由电场e确定的偏微分方程。
It is a partial differential equation satisfied by the electric field e.
顺便说一下，也可以从微分的角度来考虑。
By the way, we can also think of it in terms of differentials.
因此可以马上写下，这个微分方程的，解法。
So you can write down immediately the solution to this differential equation.
我只需要取它的对数，对温度微分。
I just need to take log of it, take its derivative with respect to temperature.
得到一个微分方程。
让我们首先，对分母做温度的微分。
So let's take the derivative with respect to the temperature on the bottom first.
我们已经讲了微分。
建立了在该状态下的运动微分方程。
Motion differential equation is established in this condition.
其运动方程是一个非线性微分方程。
我们来看g的微分。
下面我会就这三者稍微分别谈论一下。
所以我们就消掉了G的微分。
所以你要做的第一件事是你写下，你的微分方程。
So the first thing you do is your write down your differential equations.
只是在用微分的语言表达，来看先前提到的例子。
Just in the language of differentials. The example that I promised.
哪里是友谊和爱情的细微分野？
Where is the fine demarcation line between Love and Friendship?
这是个微分方程。
常微分方程是大自然的语言。
The Ordinary differential equation is the language of the nature.
为什么我们偏爱偏微分呢？
这是研究正倒向随机微分方程的基础。
This work is a foundation of the study of forward-backward equations.
该控制微分方程求解简便。
The solution of the governing differential equations is very easy.
这是一个我们先前不了解的精密复杂的微分信号系统。
This is a sophisticated differential signaling system that we haven't previously known about.
常微分方程中经典的存在性定理不能使用。
Often the existence axioms of classic in the differential calculus square distance can't use.
有其它的方式来得到的，从这里开始求微分。
But we have another way to find it, which is starting from this and differentiating.
使用椅子的扶手或者站立时双脚稍微分开。
Use the arms on the chair, or stand with your feet a bit apart.
例如，这个解决方案的微分方程是一个功能。
For example, the solution of a differential equation is a function.
积分上限函数是一元函数微分学的基本概念。
Integral upper limit function is a basic concept in function differential calculus.
当对下面做微分的时候，这里的负号就消失了。
The minus sign here disappears when you take the derivative on the bottom.
这些量不是全微分。
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