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.
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.
函数是连续可微分的。
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.
本文在一维情形下对拟可微函数的星核进行了讨论，证明了拟微分星-有界等价子类的存在性；
In this paper, the star-kernel of a quasi-differentiable function in one-dimensional space is studied.
含有微分函数的方程。
含有微分函数的方程。
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