Why do we like partial derivatives?
为什么我们偏爱偏微分呢？
We are trying to understand partial derivatives.
我们还要试图理解偏导数。
It has only partial derivatives for each variable.
它只有关于每个变量的偏导数。
Suppose and have continuous partial derivatives on.
设，在上有连续的偏导数。
So, we have to figure out what we mean by partial derivatives again.
因此，我们应该重新理解偏导数的含义。
And a partial differential equation is some relation between its partial derivatives. Let me see.
而一个偏微分方程就是，函数各个偏导之间的联系，看看。
A partial differential equation is an equation that involves the partial derivatives of a function.
偏微分方程就是，跟函数各个偏导数有关的方程。
A partial differential equation is an equation that involves the partial derivatives of a function.
偏微分方程就是，跟函数各个偏导数有关的方程。
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