郭潔婷
(五邑大學(xué)數(shù)學(xué)與計(jì)算科學(xué)學(xué)院,廣東江門529020)
從Zygmund型空間到α- Bloch空間的加權(quán)復(fù)合算子的緊性分析
郭潔婷
(五邑大學(xué)數(shù)學(xué)與計(jì)算科學(xué)學(xué)院,廣東江門529020)
摘要:令φ,u分別是復(fù)平面C上的單位開圓盤D中的解析自映射和解析函數(shù).加權(quán)復(fù)合算子定義為(uCφ)(f)(z)= u(z)f(φ(z),(z∈D,f∈H(D)),本文討論了該加權(quán)復(fù)合算子從Zygmund型空間到α- Bloch空間的緊性.
關(guān)鍵詞:加權(quán)復(fù)合算子;α- Bloch空間;Zygmund型空間;緊性
記D為復(fù)平面C中的開單位圓盤,H(D)表示D上解析函數(shù)全體組成的函數(shù)空間. Cφ定義為D上解析自映射φ所誘導(dǎo)的復(fù)合算子:Cφ(f)(z)= f(φ(z),z∈D,f∈H(D).我們知道:若一個(gè)線性算子它把有界集映為有緊閉包的集合,則稱它是緊的.在解析函數(shù)空間中,我們感興趣的是找出φ所誘導(dǎo)的有界算子或緊算子的函數(shù)理論特征.對于這方面的研究,相應(yīng)的結(jié)果見文獻(xiàn)[1-2].
設(shè)u是D上的解析函數(shù),定義H(D)上的加權(quán)復(fù)合算子uCφ:(uCφ)(f)(z)= u(z)f(φ(z),(z∈D,f∈H(D)),它是乘積算子和復(fù)合算子的推廣.
本文主要研究從Zygmund型空間到α-Bloch空間的加權(quán)復(fù)合算子的緊性,可看作是對文獻(xiàn)[5-6]中結(jié)果的推廣.
參考文獻(xiàn):
[1]ZHU K H . Operator Theory in Functions Spaces[M]. New York:Springer, 1990:300-348.
[2]COWEN C C, Maccluer B D. Composition Operator on Spaces of Analytic Functions[M]. Boca Rat on:CRC Press, 1995:329-380.
[3]DUREN P L . Theory of HpSpaces[M]. New York:Academic Press, 1970:268-280.
[4]LI S X , STEVIC S. Volterra Type Operators on Zygmund Space[J]. J Inequal Appl, 2007, 2007:1-10.
[5]鄒堃,譚海鷗.從Zygmund空間到Bloch-type空間的加權(quán)復(fù)合算子[J].青島理工大學(xué)學(xué)報(bào),2010,31(5):105-108.
[6]SANATPOUR A H, HASSANLOU M. Essential norms of weighted composition operators between Zygmund-type spaces and Bloch-type spaces[J]. Turkish Journal of Mathematics, 2014(38):872-882.
The Compactness of the Weighted Composition Operators from Zygmund Type Spaces to α- Bloch Spaces
GUO Jieting
(School of Mathematics and Computational Science, Wuyi University, Jiangmen 529020, China)
Abstract:Let φ be an analytic self-map and u be a fixed analytic function in the open unit disk D on the complex plane C .The weighted composition operator is defined by(uCφ)(f)(z)= u(z)f(φ(z),(z∈D,f∈H(D)). This paper studies the compactness of the weighted composition operators from Zygmund type spaces to α- Bloch spaces .
Key words:weighted composition operator;α- Bloch space;Zygmund type space;compactness
中圖分類號:O174.5
文獻(xiàn)標(biāo)識碼:A
文章編號:1008-2794(2016)02-0091-05
收稿日期:2015-04-02
通信作者:郭潔婷,碩士研究生,研究方向:復(fù)分析及其應(yīng)用,E-mail:770515028@qq.com.