极值函数 meaning in English

extremal function

Estimates on the extremal sobolev - hardy functions
极值函数的估计
Determining the extreme values and extremal functions of the analytic functions on d = { z $ c : z < 1 } is very important in the principles of univalent functions . baernstein [ 2 ] gave the conclusion by using koebe function as the extremal function , glenn schober [ 6 ] studied the classes such as s , p , k , s * of h ( d ) and represented these functions with integral formulations . wang jian [ 3 ] and others investigated the integral mean values
Baernstein首先在单位圆上讨论给出了以koebe函数作为极值函数的结论， glennschober对h ( d )中一些函数子类如s 、 p 、 k 、 s ~ *等作了研究，将这些子类上的函数用积分表达出来，王键结合baernstein ~ *函数的定义及glennschober的结论，定义了对称集的概念并得出了一些函数类在其上的积分平均。