A direction derivative method for the analysis of the effects of asymmetric stores on flutter speed is presented.

提出了一种分析不对称外挂对飞机颤振影响的方向导数法。

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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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And then, what's the derivative in that direction?

那么，那个方向的导数是什么呢？

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