摘要
通过举反例,说明了函数在某点的方向导数与函数在该点的连续性、可偏导性、可微性等之间的关系,以及方向导数与其计算公式之间的有关问题.
Through examples, we illustrate the relationships between the directional derivative and continuity, partial derivatives, differentiability of function at some point, as well as the related issues between the directional derivative and its calculation formula.
出处
《山东师范大学学报（自然科学版）》
CAS
2015年第2期24-26,30,共4页
Journal of Shandong Normal University(Natural Science)
基金
湖北省教育科学规划“十二五”规划课题基金资助项目（20138308）.
关键词
方向导数
连续
偏导数
可微分
directional derivative
continuity
partial derivatives
differentiability
