Weighted Composition Operators fromα-Bloch Spaces to H~∞

The article not only presents the boundedness and compactness of the weighted composition operator from α-Bloch spaces（or little α-Bloch spaces） to H^∞, but also gives some estimates for the norm of the weighted composition operator.

COMPOSITION TYPE OPERATORS FROM HARDY SPACES TO μ-BLOCH SPACES ON THE UNIT BALL

Let φ be a holomorphic self-map of Bn and ψ ∈ H（Hn）. A composition type operator is defined by Tψ,φ（f） = ψf o φ for f ∈ H（Bn）, which is a generalization of the multiplication operator and the composition operator. In this article, the necessary and sufficient conditions are given for the composition type operator Tψ,φ to be bounded or compact from Hardy space HP（Bn） to μ-Bloch space Bμ（Bn）. The conditions are some supremums concerned with ψ,φ, their derivatives and Bergman metric of Bn. At the same time, two corollaries are obtained.

ON DIRICHLET TYPE SPACES AND α-BLOCH SPACES IN THE UNIT BALL OF C^n

In this paper, the authors study the inclusion relations between Dirichlet type spaces DΥT and α-Bloch spaces βα by means of higher radial derivative. The strictness and the best possibility of the inclusion relations are shown with constructive methods. Furthermore, they sharpen one of the results when Υ=n, which proves that a conjecture in [7] is true.

COMPOSITION OPERATORS ON THE LITTLE BLOCH SPACE IN POLYDISCS

Let U^n be the unit polydisc of C^n and φ（φ,…,φ） a holomorphic selfmap of U^n. This paper shows that the composition operator Cφinduced by φis bounded on the little Bloch space β0＊（U^n） if and only if φ ∈β0＊（U^n） for every ι=1,2,... ,n, and also gives a sufficient and necessary condition for the composition operator Cφto be compact on the little Bloch space β0＊ （U^n）.

Little Hankel Operators on the Weighted Bergman Space of the Unit Ball

In this paper we mainly consider little Hankel operators with squareintegrable symbols on the weighted Bergman spaces of the unit ball.We obtain that Schatten class of little Hankel operators is equivalent to Schatten class of positive Toeplitz operators under the conditions that SMO（f） ∈ L p/2 （B n,dλ） and 2 ≤ p ∞,which is very important to research the relation between Toeplitz operators and little Hankel operators.

BOUNDEDNESS FROM BELOW OF MULTIPLICATION OPERATORS BETWEEN α-BLOCH SPACES ON THE UNIT BALL

In this article, we characterize the boundedness from below of multiplication operators between α-Bloch spaces on the unit ball.

ON F(p,q,s)SPACES

The family of spaces F(p,q,s)was introduced by the author in 1996.Since then,there has been great development in the theory of these spaces,due to the fact that these spaces include many classical function spaces,and have connections with many other areas of mathematics.In this survey we present some basic properties and recent results on F(p,q,s)spaces.

Estimation of Maximal Dimensions of Commutable Matrix Spaces

In this paper, a lower bound of maximal dimensions of commutable matrix spaces (CMS) is given. It is found that the linear dependence of a group of one to one commutable matrices is related to whether some equations in system can be eliminated. The corresponding relation is given. By introducing conceptions of eliminating set and eliminating index, we give an estimation of upper bound of maximal dimensions of CMS. For special cases n=5,6, the further estimation of maximal dimensions of CMS is presented.

Bergman空间和q-Bloch空间之间的复合算子

本文讨论了Bergman空间和q-Bloch空间(小q-Bloch空间)之间的复合算子Cφ的有界性和紧性特征,得到了以下结论:(1)Cφ是q-Bloch空间(小q-Bloch空间)到Bergman空间的有界算子或紧算子之充要条件; (2)Cφ是Bergman空间到q-Bloch空间的有界算子或紧算子之充要条件; (3)Cφ是Bergman空间到小q-Bloch空间的有界算子或紧算子之充要条件,还给出了算子 Cφ0的范数估计,此处Cφ0(f)(z)=foφ(z)-f(φ(0))．

p-Bloch空间到小q-Bloch空间的加权复合算子

讨论了单位圆盘中p-Bloch空间到小q-Bloch空间的加权复合算子Tψ,φ的有界性和紧性,主要得到以下结论:(i)Tψ,φ是p-Bloch空间到小q-Bloch空间有界算子的充要条件;(ii)Tψ,φ是p-Bloch空间到小q-Bloch空间紧算子的充要条件,同时也给出了几个推论.

Random α-Bloch Function

In this note, we consider power series f w(z)=∑∞n=0a ne iw n z nwhere moduli a n of the coefficients are given but the argument α n are random. We discuss the conditions of f w is in α_ Bloch space and little α_ Bloch space. Our results generalize Anderson, Clunie and Pommerenke's.

对数(α,β)-Bloch空间的新刻画

讨论了单位圆盘上对数(α,β)-Bloch空间的积分性质,得到了该空间的五个等价刻画.并对小对数(α,β)-Bloch空间做了类似推广,得到了小对数(α,β)-Bloch空间的五个等价刻画.最后,利用Carleson测度这个重要工具对这两个空间进行了描述,得到了解析函数分别属于这两个空间的充分条件.

单位球上小α-Bloch空间与随机幂级数

讨论了单位球上小α-Bloch空间与随机幂级数∑α≥0εαaαzα,得到了随机幂级数∑α≥0εαaαzα属于小α-Bloch空间的一个充分条件.

C^n中H~∞空间和小p-Bloch空间之间的乘子

函数空间点乘子的刻划对研究函数空间算子理论和函数空间性质有着直接的意义 .本文借助Bergman算子、阶的估计、泛函理论等知识刻划了Hardy空间H∞ 到小p -Bloch空间 βρ0 以及 βρ0 到H∞ 的点乘子 ,得到了完整的乘子空间M(H∞ ,βρ0 )和M(β ρ0 ,H∞) ,即 (i) 0 ≤p <1时 ,φ∈M(H∞ ,βρ0 ) φ≡ 0 ; p >1时 ,M(H∞ ,βρ0 ) =βρ0 ; p≥ 1时 ,φ ∈M(βρ0 ,H∞) φ≡ 0 ; 0 <p<1时 ,M(βρ0 ,H∞) =H∞ .

THE COMPACT COMPOSITION OPERATOR ON THE μ-BERGMAN SPACE IN THE UNIT BALL

Let p 〉 0 and μ be a normal function on [0, 1）, u（r） = （1 - r2）1＋n^pμ（r） for r ∈ [0, 1）. In this article, the bounded or compact weighted composition operator Tφ,ψ from the μ-Bergman space AP（p） to the normal weight Bloch type space β （r）in the unit ball is characterized. The briefly sufficient and necessary condition that the composition operator Cφ is compact from A^p（μ） to βv, is given. At the same time, the authors give the briefly sufficient and necessary condition that Cv is compact on βμ, for a 〉 1.

Weighted composition operators between μ-Bloch spaces on the unit ball

In this paper,necessary and sufficient conditions are given for the weighted composition operator T_(ψ,ψ) to be bounded or compact from the space β_μ to β_ν (or β_(μ,0) to β_(ν,0) ) on the unit ball of C^n.At the same time,a series of corollaries are also obtained.

Composition Operators on α-Bloch Spaces of the Unit Ball

The authors characterize the boundedness and compactness of composition operators between α-Bloch spaces of the unit ball.

Weighted Composition Operators of H~∞ intoα-Bloch Spaces on the Unit Ball

In this paper we characterize the boundedness and compactness of weighted composition operators of H∞ into α-Bloch spaces on the unit ball in C^n.

复Banach空间的单位球上Bloch-型空间之间的有界的加权复合算子

设X是有限或无限维的复Banach空间.作者刻画了X的单位球上Bloch-型空间与小Bloch-型空间之间的有界的加权复合算子,从而推广了有限维区域上的一些结果。

C^(n)中单位球上加权小Bloch空间上的复合算子

定义了C n中单位球B n上加权小Bloch空间B_(0,log)={f∈H(B_(n))|lim|z|→1-(1-|z|^(2))ln 2/1-|z|^(2)|▽f(z)|=0},刻画了该空间上的复合算子Cφ,探讨了该空间上复合算子Cφ有界性与紧性的充要条件.