摘要
讨论了一类实解析函数在极小(大)值点附近存在凸(凹)性区间的条件,得到了如下主要结果:若非常值函数y=f(x)在x0处取得极小(大)值,且在x0的某一邻域G内实解析的,则存在x0的一小邻域G*G,使得原函数在G*上为凸(凹)的。
In this paper, under what conditions there is a domain is discussed in which the given real analytic function near the minimum (maximum) point is convex (concave). A main result is gained as follows, if the non-constant function of one variable y= f(x) gets minimum (maximum) at point x0, and is real analytic in some neighborhood G of x0, then there exists a smaller neighborhood G^* belong to G of x0 such that the given function is convex (concave).
出处
《湛江海洋大学学报》
CAS
2006年第3期64-67,共4页
Journal of Zhanjiang Ocean University
关键词
极值点
凸函数
实解析
extreme point
convex function
real analysis