摘要
对现行教材中 f(x ,y)在点 p(x0 ,y0 )处可微的必要、充分性做了分析 ,给出了f(x ,y)在点p(x0 ,y0 )
This article makes an analysis on the necessary and full condition to the differential duality function of f(x,y )at the point P(x 0,y 0) and presents a necessary and full condition about it.
出处
《石家庄职业技术学院学报》
2000年第3期23-30,共2页
Journal of Shijiazhuang College of Applied Technology
关键词
充分性
必要性
充要条件
differntial
partial derivative
a full and necessary condition
