TWO PROBLEMS ABOUT COMPOSITION OPERATORS ON HARDY SPACE

In this paper, two problems about composition operator on Hardy space are considered. Firstly, a new estimation of the norm of a class of composition operators is given. Secondly, the cyclic behavior of the adjoint operator of a composition operator is discussed.

作 者： WU Shuhong WANG Maofa Liu Peide   作者單位： WU Shuhong(Department of Mathematics, Huazhong Un rsity of Science and Technology, Wuhan 430074, China)

WANG Maofa,Liu Peide(School of Mathematics and Statistics, Wuhan University, Wuhan 430072, China) 

刊 名： 數學物理學報（英文版）  ISTIC SCI 英文刊名： ACTA MATHEMATICA SCIENTIA  年，卷(期)： 2005 25(3)  分類號： O41  關鍵詞： Hardy space   composition operator   numerical range   cyclic vector  

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