不是每个函数都有导数。
我们说一个函数是可微的，如果这些偏导数存在。
And, we say that a function is differentiable if these things exist.
有些不是规则的函数，却有导数。
You have functions that are not regular enough to actually have a derivative.
并讨论说明了导函数的右(左)极限与右(左)导数之间的关系。
And demonstrates the relations between the right (left) limit of function and right (left) derivative.
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.
微积分中求导数为已知函数之函数的过程。
In calculus, the process of finding a function whose derivative is a given function.
将求两个函数的乘积的高阶导数的莱布尼兹公式作了多种形式的推广。
In this paper various forms for the Leibniz formula have been given.
将求两个函数的乘积的高阶导数的莱布尼兹公式作了多种形式的推广。
In this paper various forms for the Leibniz formula have been given.
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