节点文献
关于丛属函数的几个不等式
SOME INEQUALITIES IN THE THEORY OF SUBORDINATION
【摘要】 <正> 1.引言.设(?)是单位圆中的正则函数,函数w=F(z)将|z|<1映照成黎曼面S_F.设函数(?)在单位圆中是正则的.假如w=f(z)的一切函数值都落在 S_F,上,那末说 f(z)丛属于 F(z),记此关系为 f(z)(?)F(z).我们知道 f(z)(?)F(z)的充要条件是存在|z|<1上的正则函数ω(z),适合|ω(z)|<1,ω(0)=0,和 f(z)≡F(ω(z)).
【Abstract】 Let(?)conformally represents |z|<1 on a Riemann surface SF.We say that f(z)subordinate to F(z) if ao=bo,and f(z)takes only values inside SF.Weexpress this relation by f(z)(?)F(z).If Sf is a schlicht part of SF,then f(z)is said to be schlicht subordinate to F(z).If t(z)(?)F(z),Rogosinski[1,2] established the inequlity(?)for n=1 and 2.In this paper,T.S.Shah proves that(?)and that the constant 21/2 is the best possible (Theorem 1).K.M.Changpoints out that the (1) holds good for n=3,if f(z) is schlicht subordinateto F(z) (Theorem 2).Finally,K.M.Chang proves that if f(z)(?)F(z),f(0)=F(O)=0,and ifF(z) is schlicht in |z|1,then the map Sf covers the circle(?)but not any larger circle(Theorem 3).
- 【文献出处】 数学学报 ,Acta Mathematica Sinica , 编辑部邮箱 ,1958年03期
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