Analytic function;
Normal function;
alpha-Normal function;
Extreme point;
CONVEX-FUNCTIONS;
FAMILIES;
D O I:
10.1007/s40840-020-00912-z
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
In this paper, we consider the existence of extreme points of analytic alpha-normal functions. First, in terms of alpha-normal unit-valued set, we obtain a necessary condition for a little alpha-normal function to be an extreme point of N0,1 alpha-normal functions in the unit disk; second, we prove that the alpha-normal unit-valued set of a little alpha-normal function in N0,1 alpha consists of several simple closed pairwise disjoint analytic curves and several isolated points.