多复变数的抛物星形映射

本文给出了抛物星形映射,ρ次的抛物星形映射,抛物形β型螺形映射和ρ次的抛物形β型螺形映射的定义.证明了推广的Rope-Suffridge算子保持这些映射的几何性质不变.     

多复变数星形映照的两类子族

本文首先讨论有界星形圆型域上星形映照的一个子族---次星形映照,着重研究其几何性质,包括增长定理与掩盖定理.然后,在有界凸圆型域上讨论星形映照的另一类子族---α次的γ-凸映照.讨论它与星形映照,β次星形映照以及凸映照的关系.     

Asymptotically Spirallike Mappings in Reflexive Complex Banach Spaces

In this paper we consider the notion of asymptotic spirallikeness in reflexive complex Banach spaces $X$ , and the connection with univalent subordination chains. Poreda initially introduced the notion of asymptotic starlikeness to characterize biholomorphic mappings on the unit polydisc in $\mathbb{C }^{n}$ which have parametric representation in the sense of Loewner theory. The authors introduced the notions of $A$ -asymptotic spirallikeness and $A$ -parametric representation on the Euclidean unit ball of $\mathbb{C }^{n}$ , where $A\in L(\mathbb{C }^{n})$ with $m(A)>0$ . They showed that these notions are equivalent whenever $k_+(A)<2m(A)$ . In this paper we prove that if $k_+(A)<2m(A)$ and $f\in S(B)$ has $A$ -parametric representation, then $f$ is also $A$ -asymptotically spirallike on the unit ball $B$ of $X$ . For the converse, we need the additional assumption that $f$ is a smooth $A$ -asymptotically spirallike mapping, except in the finite-dimensional case $X=\mathbb{C }^{n}$ with an arbitrary norm. The notion of asymptotic spirallikeness involves differential equations and may be regarded as giving a geometric characterization of certain domains in $X$ . That is one of the motivations for considering this notion in the case of reflexive complex Banach spaces.     

Banach空间中多值映象的不动点定理

本文中我们首先证明了一个不动点定理，同时从压缩及弱内向两个方向推广了压缩弱内向映象的不动点定理［１，２］．在后两节中讨论了Ｂａｎａｃｈ空间中无界闭子集上的不动点定理，所得结果推广了［３，４］中相应定理．     

Banach空间中两类压缩映射的迭代逼近

讨论了Banach空间中拟压缩映射和广义压缩映射的具误差的Ishikawa迭代序列的收敛性,得出了在一定条件下,这两类压缩映射分别强收敛于它们的不动点.这些结论推广和发展了已有的相关结果,使这些结果的适用范围更广.     

自反Banach空间上的Massera准则

本文主要讨论了自反Banach空间上非齐次微分方程和线性时滞泛函微分方程的Massera准则.     

λ—固定非扩张半群的不动点定理

设X是一致凸的Banach空间,C是X的有限个非空有界闭凸子集的并,0＜λ＜1,F=(T(t)t≥0}是C上的λ-固定非扩张半群,本文证明了F最终有公共不动点.     

λ-固定非扩张半群的不动点定理

设 X是一致凸的 Banach空间 ,C是 X的有限个非空有界闭凸子集的并 ,0 <λ<1 ,F={T(t) :t≥ 0 }是 C上的λ-固定非扩张半群 ,本文证明了 F最终有公共不动点 .     

Hilbert空间中的双全纯凸映照和双全纯星形映照的构造

利用复的Hilbert空间中的Riesz基{xj}及其对偶Riesz基{yj},引入新的算子Φ({xj},{yj},{gj})(z),来构造出复的Hilbert空间中的单位球β上的一些双全纯凸映照或双全纯星形映照,利用复的Hilbert 空间中的框架理论,得到此算子的一些性质,给出由复平面C中的单位圆△上的单叶凸函数或单叶星形函数,来构造复的Hilbert 空间X中的单位球β上的双全纯凸映照或双全纯星形映照的一些具体例子,同时也引入一些双全纯凸映照或双全纯星形映照的子类.     

Banach空间中两个多值非扩张映射不动点的迭代逼近问题

研究了两个多值非扩张映射的公共不动点的迭代逼近问题.利用Hausdoff度量,引入了一类新的Ischikawa型迭代,在一致凸的Banach空间里,证明了在某些条件下,此迭代序列强收敛到多值非扩张映射的公共不动点.改进和推广了文献的相关结果.     

Banach空间中复指数函数系的不完备性

In this paper, we obtain a necessary and sufficient condition for the incompleteness of complex exponential system in Cα, where Cα is a weighted Banach space of complex continuous functions f on the real axis R with f(t) exp{-α(t)}vanishing at infinity, in the uniform norm.     

Sufficient conditions for normal structure in a Banach space

We present two sufficient conditions for normal structure in a Banach space. The first one is given in terms of the new modulus which is a generalization of Gao’s modulus of U-convexity and the second one is given by the presence of full 2-rotundity of the dual space and the WORTH property.     

Banach空间中广义平衡问题和一族相对非扩张映象的强收敛定理

在Banach空间中,用收缩投影的方法证明了广义平衡问题和一族相对非扩张映象的公共不动点的强收敛定理.结论改进了最近一些人的研究结果     

Close-to-Convexity Criteria for Planar Harmonic Mappings

We give a criteria for planar harmonic mappings to be univalent close-to-convex which settles a conjecture of P. T. Mocanu.     

Growth Theorem and Distortion Theorem for a Sub class of Parab olic Starlike Mappings

In this article, we firstly introduce a subclass of parabolic starlike mappings writen as P S (β;ρ). Secondly, the growth theorem for P S (β;ρ) on the unit ball in complex Banach space is obtained. Finaly, as the application of the growth theorem of P S (β;ρ), the distortion theorem along a unit direction is also established.     

Banach空间中单值非扩张映射和多值非扩张映射公共不动点混合迭代逼近研究

引入了两个单值非扩张映射与两有限族多值非扩张映射新的混合迭代,在Banach空间中,研究了两个单值非扩张映射与两有限族多值非扩张映射在新迭代下关于公共不动点的收敛性,改进和推广了已有文献相关的结果.     

Iterative Methods for Nonexpansive Mappings in Banach Spaces

In this article, we suggest and analyze two methods for finding fixed points of nonexpansive mappings in Banach spaces. We prove that the proposed methods converge strongly to a fixed point of nonexpansive mappings.     

复Banach空间单位球上几类映射的增长掩盖定理

对α次的殆β型螺形映射,α次的β型螺形映射和α次的强β型螺形映射,给出了定义,并且在复Banach空间中的单位球上分别得到它们的增长掩盖定理．