涉及复代数超曲面的全纯映射正规族（英文）

本文研究了涉及固定超曲面的全纯映照的正规性问题.利用Aladro和Krantz对全纯映射族正规性的刻画和Shirosahi建立的一系列涉及一些特殊复代数超曲面的Picard型定理,得到了全纯映射族的一些正规定则.     

Montel定则的进一步推广

本文研究了全纯函数族的正规性问题.利用Zalcman引理,证明了全纯函数族的几个正规定则,推广了Montel正规定则.     

关于全纯函数的正规定则

研究涉及微分多项式与公共值的全纯函数族的正规性问题.设F为区域D内的全纯函数族,n 1为任一正整数,b为有限常数,如果对F中任意两个函数f与g,fn(f-1)f′与gn(g-1)g′在D内都以b为公共值,则F在D内正规.此结果对亚纯函数不成立.     

拟亚纯映射的正规族

用几何方法研究更广泛的拟亚纯映射. 讨论了拟亚纯映射族正规的充分必要条件. 证明了两个关于覆盖曲面的不等式,利用它们证明了几个关于拟亚纯映射的正规定理. 显然,这些正规定理对亚纯函数族也成立.     

关于多元复函数的正规族

研究函数族的正规性定则是复变函数论中的一个重要且有意义的工作,本文通过引进多元Ｋ－拟亚纯函数（或Ｋ－全纯函数）的定义,得到了多元Ｋ－拟亚纯函数（或Ｋ－全纯函数）族的一个正规定则,据此讨论了多元纯函数（族的若干正规性定则。     

多复变全纯映射正规族关于连续移动超平面的一个充要条件

证明了从C~n的一个区域到P~N(C)中的多复变全纯映射族为正规族的一个充要条件.这个充要条件与P~N(C)中的逐点处于一般位置的连续移动超平面族有关.证明的主要方法来自于微分方程.     

涉及连续函数的正规族问题新研究

运用连续函数的拓扑度理论,研究了全纯函数族分担连续函数的正规性问题.     

亚纯函数族结合导数涉及重值时的正规性

<正> §1.引言 杨乐、张广厚对全纯函数族结合导数涉及重值时的正规性进行了研究,他们得到了如下结果. 定理A.设∑为平面区域Ω上的全纯函数族.若f∈∑有:f(z)的零点的重级均≥m,f~((k))(z)-1的零点的重级均≥n,且k+1/m+1/n<1,则∑在Ω内正规.     

广义de Sitter空间中法向Lorentzian超曲面的nullcone Gauss映射的奇点

利用奇点理论研究了广义de Sitter空间中具有Lorentzian法空间的一类超曲面.介绍了这类超曲面的局部微分几何,定义了nullcone Gauss映射及nullcone高度函数族,进而研究了nullcone高度函数族的性质及nullcone高斯映射的几何意义,最后研究了这类超曲面的通有性质.     

亚纯函数涉及分担函数的正规定则

本文研究亚纯函数涉及分担函数的正规性.设■为定义在区域D上的全纯函数族,n,k,m(≥0)是三个整数,其中n≥k+m+2,p(z)是区域D上零点重数为m的全纯函数.如果函数族■中任意两个函数(f,g)均满足(f~n)~((k))和(g~n)~((k))分担p(z),则■在D上正规.     

Normal families of meromorphic mappings of several complex variables into PN (C) for moving targets

Motivated by Ru and Stoll’s accomplishment of the second main theorem in higher dimension with moving targets, many authors studied the moving target problems in value distribution theory and related topics. But thereafter up to the present, all of researches about normality criteria for families of meromorphic mappings of several complex variables into P^N (C) have been still restricted to the hyperplane case. In this paper, we prove some normality criteria for families of meromorphic mappings of several complex variables into P^N(C) for moving hyperplanes, related to Nochka’s Picard-type theorems. The new normality criteria greatly extend earlier related results.

     

Une question sur les équations xm ? ym = Rzn (A Question on the Equations xm ? ym = Rzn)

Let m and n be integers at least two and R be a nonzero natural number. In this paper, we study the problem of the determination of the proper solutions of the Diophantine equation x ^m – y ^m equals; Rz ⁿ . We raise a question concerning the existence of any proper nontrivial solution of this equation, in case some precise conditions are satisfied by the triple (m, n, R). We prove some results about it.     

On Meromorphically Normal Families of Meromorphic Mappings of Several Complex Variables into P(C)

We shall prove some meromorphic normality criteria for families of meromorphic mappings of several complex variables into P^N(C), the complex N-dimensional projective space, related to Nochka's Picard type theorems. Some related results (e.g., extension theorems, improved normality criteria, and quasi-normality criteria) will be obtained also. The technique in this paper mainly depends on Stoll's normality criteria for families of non-negative divisors on a domain of Cⁿ.     

Rational proper holomorphic maps from B n into B 2 n

In this paper, we will investigate rational proper holomorphic maps from Bⁿ into B²ⁿ, when n4.Mathematics Subject Classification (2000): 32H35Partially supported by Grant-in-Aid for Scientific Research (C) no. 14540195 from Japan Society for the Promotion of Science, 2004.Acknowledgement The author thanks the referee for helpful comments and suggestions.     

Bloch constant of holomorphic mappings on the unit polydisk of ℂ<Superscript><Emphasis Type="Italic">n</Emphasis></Superscript>

In this paper, we give a definition of Bloch mappings defined in the unit polydisk D ⁿ , which generalizes the concept of Bloch functions defined in the unit disk D. It is known that Bloch theorem fails unless we have some restrictive assumption on holomorphic mappings in several complex variables. We shall establish the corresponding distortion theorems for subfamilies β(K) and β _loc(K) of Bloch mappings defined in the polydisk D ⁿ , which extend the distortion theorems of Liu and Minda to higher dimensions. As an application, we obtain lower and upper bounds of Bloch constants for various subfamilies of Bloch mappings defined in D ⁿ . In particular, our results reduce to the classical results of Ahlfors and Landau when n = 1. This work was supported by the National Natural Science Foundation of China (Grant No. 10571164) and Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) (Grant No. 20050358052)     

Boundedness of Marcinkiewicz integrals and their commutators in H1 (?n × ?m)

The authors establish the boundedness of Marcinkiewicz integrals from the Hardy space H ¹ (ℝ ⁿ × ℝ ^m ) to the Lebesgue space L ¹(ℝ ⁿ × ℝ ^m ) and their commutators with Lipschitz functions from the Hardy space H ¹ (ℝ ⁿ × ℝ ^m ) to the Lebesgue space L ^q (ℝ ⁿ × ℝ ^m ) for some q > 1.     

Density of smooth maps in Wk, p(M, N) for a close to critical domain dimension

Assuming m − 1 < kp < m, we prove that the space C ^∞(M, N) of smooth mappings between compact Riemannian manifolds M, N (m = dim M) is dense in the Sobolev space W ^k,p (M, N) if and only if π _m−1(N) = {0}. If π _m−1(N) ≠ {0}, then every mapping in W ^k,p (M, N) can still be approximated by mappings M → N which are smooth except in finitely many points.     

Lp-Lq estimates for a class of pseudo-differential equations and their applications

This paper is concerned with the L ^p -L ^q estimates of the solutions for a class of pseudodifferential equations under some suitable degenerate assumptions. As applications, these estimates can be used to show that a generalized Schr?dinger operator with some integrable potential generates a fractionally integrated group in L ^p (ℝ ⁿ ).     

Extension Operators Preserving Biholomorphic Mappings on Hartogs Domains*

In this paper, the authors extend the Roper-Suffridge operator on the generalized Hartogs domains. They mainly research the properties of the extended operator.By the characteristics of Hartogs domains and the geometric properties of subclasses of spirallike mappings, they obtain the extended Roper-Suffridge operator preserving almost starlikeness of complex order λ, almost spirallikeness of type β and order α, parabolic spirallikeness of type β and order ρ on the Hartogs domains in different co...     

On the Classification of Twisting Maps Between Kn and Km

We define the notion of admissible pair for an algebra A, consisting on a couple (Γ, R), where Γ is a quiver and R a unital, splitted and factorizable representation of Γ, and prove that the set of admissible pairs for A is in one to one correspondence with the points of the variety of twisting maps T_Aⁿ:=T(Kⁿ,A)\mathcal{T}_A^n:=\mathcal{T}(K^n,A). We describe all these representations in the case A = K ^m .