But, we can still ask, is there a derivative in every direction?
但我们仍想问，是否在每个方向上都有一个导数呢？
And then, what's the derivative in that direction?
那么，那个方向的导数是什么呢？
Well, it's actually the directional derivative in that direction.
它其实是那个方向的方向导数。
And,the slope is going to be the directional derivative in that direction OK, I think that's as graphicas I can get.
这个斜率就是此方向的方向导数,好了，我想我说的已经尽量图形化了。
The directional derivative in a direction that's perpendicular to the gradient is basically zero.
垂直于梯度的方向上,方向导数为零。
In this paper, with the aid of idea of defining those sets and functions, the definitions of E -convex cone, pseudo-quasi- E -convex functions, E -direction derivative are discussed.
借助于这些集合和函数的定义思想，本文定义了E-凸锥、伪拟E -凸函数、E -凸函数方向导数等几种更广义的概念。
In this paper, with the aid of idea of defining those sets and functions, the definitions of E -convex cone, pseudo-quasi- E -convex functions, E -direction derivative are discussed.
借助于这些集合和函数的定义思想，本文定义了E-凸锥、伪拟E -凸函数、E -凸函数方向导数等几种更广义的概念。
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