多复变数某类推广的螺型映射精确的系数估计

主要用统一方法建立限制条件下复Banach空间单位球与Cn中单位多圆柱上某类推广的β型螺型映射全部项齐次展开式的精细估计.同时,也用统一方法建立较弱限制条件下Cn中Dp1,p2,…,pn=■,pl>1,l=1,2,…,n上某类推广的β型螺型映射主要系数的精细估计.特别地,限制条件下k折对称β型螺型映射的结果是精确的.所得结果包含前面文献中许多已知结论.     

有界凸平衡域上的双全纯凸映照的判别准则

本文讨论Cn中有界强凸平衡域和凸平衡域上局部双全纯映照成为双全纯凸映照的充要条件,从而得到Reinhardt域Dp= 上双全纯凸映照的充要条件,其中Pj≥2(j=1,2,…,n).     

复Banach空间中单位球上双全纯凸映射的偏差定理

本文讨论一般复Banach空间上单位球B的Caratheodory度量和Kobayashi 度量的性质,并据此将Cn(n≥1)中单位球Bn上双全纯凸映射的矩阵形式偏差定理 推广到一般复Banach空间的单位球B上.     

多复变数一类螺型映射子族各项齐次展开式的精细估计北大核心CSCD

本文主要建立了复Banach空间单位球上与C^(n)中单位多圆柱上带有具体参数表示的一类螺型映射子族各项齐次展开式的精细估计.特别地,k+1阶齐次展开式的结果是精确的.同时给出复Banach空间单位球上与C^(n)中单位多圆柱上带有参数表示的一类k折对称双全纯螺型映射子族各项齐次展开式的估计,且k+1阶齐次展开式的结果也是精确的.所得结果包含一些先前文献的许多已有结论.     

~n中双全纯凸映射的偏差定理

本文通过考虑n（n≥1）中单位球Bn上双全纯凸映射展开式的二阶系数估计,研究了该类映射的一种偏差定理,推广并改进了龚升等人（见[1]）的工作。     

Reinhardt域B_p上正规化双全纯完全准凸映射的齐次展式

本文主要研究C~n中有界凸Reinhardt域B_p上正规化双全纯完全准凸映射的齐次展开式问题,设f(z):B_p→C~n(p＞2)是一个正规化双全纯完全准凸映射,k是满足k＜p≤k+1的自然数,那么f_j(z)=z_j+α_(j2)z_j~2+…+α_(jk)z_j~k+O(|z|~(K+1)),其中f_j是f的第j个分量,j=1,2…．,n．     

多复变数完全拟凸映射的分解定理

设Ω1(∪) Cn1,Ω2(∪)Cn2为凸的Reinhardt域,f(z,w)=(f1(z,w),f2(z,w))′为Ω1×Ω2上的正规化全纯映射.本文证明f为Ω1×Ω2上的正规化双全纯完全拟凸映射当且仅当f(z,w)=(Φ1(z),Φ2(W))′,其中ΦjΩj→Cnj是Ωj(j=1,2)上的正规化双全纯完全拟凸映射.     

α型螺形映照精细的增长、掩盖定理及精细的展开式系数估计

本文考虑一般复Banach空间中单位球上和Cn中单位多圆柱上的正规化双全纯α(-π/2<α<π/2)型螺形映照f(其中x=0是f(x)-x的k+1阶零点),研究了它的构造,并得到其精细的增长、掩盖定理以及齐次展开式的精细估计．所得的结果包含了许多已知的结论．     

一类α次殆星形映照的偏差定理

近年来,双全纯凸(准凸)映照的偏差定理的研究已经获得一些可喜成果,但目前星形映照的偏差定理研究成果还较少.利用α次殆星形映射的增长估计,我们得到了C~n中开单位球B~n上一类α次殆星形映射的偏差估计.对复Banach空间单位球B和Reinhard域Ω_p1,…,p_n,可得到同样的结论,正如猜想的一样.     

一类统计量的强大数律和重对数律的精确极限性质

设{Xn,n≥1}是独立同分布随机变量序列,EX1=0,EX12=1.设Sn=n∑i=1Xi,Tn=Tn(X1,…,Xn)是随机函数且Tn=Sn+Rn.本文证明在E|Rn|2∨r《∞或E|Rn|《∞下,对随机函数Tn成立着Baum-Katz强大数律和重对数律的精确极限性质的一般结果.由此作为推论,对U-统计量,Von-Mises统计量,线性过程,移动平均过程,线性模型中误差方差估计和功率和等在适当矩条件下均可写出Baum-Katz强大数律和重对数律的精确极限性质.     

多复变数一类α次星形映射齐次展开式各项的精细估计

本文首先给出复Banach空间单位球上一类α次星形映射齐次展开式各项的精细估计,特别当这些映射又是k折对称映射时,估计还是精确的.其次建立C~n中单位多圆柱上上述推广映射齐次展开式各项的精细估计,同样当这些映射又是k折对称映射时,估计仍是精确的.由此证明了多复变数中关于α次星形映射的弱Bieberbach猜想,且所得到的估计都能回到单复变数的情形.     

The estimates of all homogeneous expansions for a subclass of biholomorphic mappings which have parametric representation in several complex variables

In this paper, we obtain the estimates of all homogeneous expansions for a subclass of biholomorphic mappings which have parametric representation on the unit ball of complex Banach spaces.Meanwhile, we also establish the estimates of all homogeneous expansions for the above generalized mappings on the unit polydisk in C~n. Especially, the above estimates are only sharp for biholomorphic starlike mappings and starlike mappings of order α under restricted conditions. Our derived results generalize many known results.     

Mappings Which Have a Parametric Representation in Several Complex Variables

In this paper, the sharp distortion theorems of the Fr\''echet-derivative type for a subclass of biholomorphic mappings which have a parametric representation on the unit ball of complex Banach spaces are established, and the corresponding results of the above generalized mappings on the unit polydisk in $\mathbb{C}^n$ are also given. Meanwhile, the sharp distortion theorems of the Jacobi determinant type for a subclass of biholomorphic mappings which have a parametric representation on the unit ball with an arbitrary norm in $\mathbb{C}^n$ are obtained, and the corresponding results of the above generalized mappings on the unit polydisk in $\mathbb{C}^n$ are got as well. Thus, some known results in prior literatures are generalized.     

On the Refined Esitmates of All Homogeneous Expansions for a Subclass of Biholomorphic Starlike Mappings in Several Complex Variables

The refined estimates of all homogeneous expansions for a subclass of biholomorphic starlike mappings are mainly established on the unit ball in complex Banach spaces or the unit polydisk in Cn with a unified method. Especially the results are sharp if the above mappings are further k-fold symmetric starlike mappings or k-fold symmetric starlike mappings of order α. The obtained results unify and generalize the corresponding results in some prior literatures.     

多复变Fekete-Szeg问题

令y为单位圆盘上正规化单叶函数族.Fekete和Szeg证明了如下的著名结果:对λ∈[0,1],成立max_(f∈y)|a_3-λa_2~2|=1+2~(-(2λ)/(1-λ)).本文研究了C~n中有界星形圆形域上的星形映照的相应问题.定理的证明有假设条件,但该条件在单复变情形下是自动满足的.     

关于单叶函数系数之—基本引理及其应用

<正> 设函数 f(z)=z+a_2Z~2+…在单位圆|z|<1上是正则的单叶的.这种函数的全体形成一族 S.S 中满足条件|f(z)|1上是单叶的,除开极点ζ=∞是正则的.这种函数的全体形成一族∑.∑中满足条件|F(ζ)|>R的函     

A refinement about estimation of expansion coefficients for normalized biholomorphic mappings

A refining estimation of homogeneous expansion for / is discussed, where f belongs to a subclass of all normalized biholomorphic mappings defined on the unit polydisk in Cn or the unit ball in complex Banach spaces, and x = 0 is a zero of order k 1 of f(x)-x. Moreover, an estimation of homogeneous expansion for subordinate mappings defined on the unit ball in complex Banach spaces is also given.     

某类双调和映射的Landau型定理

令f(z)=h(z)+g(z)为开单位圆盘U内的调和映射.本文首先建立了有界调和映射的精确系数估计,其次得到了满足有界性条件|h(z)|+|g(z)|≤M的正规化调和映射的精确系数估计.作为其应用,得到了双调和映射的一些Landau型定理.这些结果改进和推广了早期作者的相关结果.     

The Distortion Theorems for Harmonic Mappings with Negative Coefficient Analytic Parts

Some sharp estimates for coefficients, distortion and the growth order are obtained for harmonic mappings $f ∈ TL^α_H$which are locally univalent harmonic mappings in the unit disk $\mathbb{D}:=\{z:|z| < 1\}$. Moreover, denoting the subclass $TS^α_H$ of the normalized univalent harmonic mappings, we also estimate the growth of $|f|,$ $f ∈ TS^α_H,$ and their covering theorems.