交换子在加权Herz型Hardy空间上的有界性

主要讨论由Lipschitz函数b与广义C-Z算子T生成的交换子[b,T]在加权Herz型Hardy空间上的有界性,证明了[6,T]从HKq1^α,p（w1,w2^q1）到HKq2^α,p（w1,w2^q2）的有界性．     

关于亚纯函数理论中与极点无涉的基本不等式

<正> 关于奈望利纳(Nevanlinna)氏第二基本不等式曾有引入纪(导)数而作之种种不同的推广,在这些推广式中,极点的密指量每见出现且有特殊作用,因之能否将此量消去是一问题.米约(Milloux)氏及熊庆来教授由不同途径各获得与极点无涉之一不等式此二结果形状互异而各有特点.熊庆来教授指出这两个结果尚可推广到更普遍的境地,我们由此方向探研得如下两个定理,为熊、米二氏者之推广.     

Pseudo-differential operators involving Watson transform

A class of pseudo-differential operators (p.d.o.'s) associated with the general Fourier kernel studied by Hardy and Titchmarsh is defined. A symbol class T ^m is introduced. It is shown that the p.d.o.'s associated with the symbol are continuous linear mappings of the Braaksma and Schuitman space T(λ,μ) into itself. An integral representation of p.d.o. is obtained. Some special forms of the symbol are considered. It is shown that these p.d.o.'s and their products are bounded in certain Sobolev type space.     

On the increments of the Wiener process

Summary Let {W(t), t0} be a standard Wiener process and 0<a _t t a nondecreasing function of t. The asymptotic behaviour of several increment processes, obtained from W and a _t , is investigated in terms of their upper classes. In some cases we characterize these classes by means of an integral test. Two such processes are (W(t+a _t) – W(t))a _t ^–1/2 and      

Boundedness for the Singular Integral with Variable Kernel and Fractional Differentiation on Weighted Morrey Spaces

Let T be the singular integral operator with variable kernel, T*be the adjoint of T and T~#be the pseudo-adjoint of T. Let T_1T_2 be the product of T_1 and T_2, T_1? T_2 be the pseudo product of T_1 and T_2. In this paper, we establish the boundedness for commutators of these operators and the fractional differentiation operator Dγon the weighted Morrey spaces.     

全有向图的幂敛指数

设D为有向图，T（D）为D的全有向图（Total-digraph),k(D)和p(D)分别为D的幂敛指数（Index of convergence)与周期（Period)，本文证明了。1，对任意非平凡有向图D,p(T(D))=1,k(T(D))≤max{2p(D)-1,2K(D) 1}，特别地，当D为本原有向图时，k(T(D))≤k(D) 1，当D不含有向圈时，k(T(D))=2k(D)-1；当D为有向圈Cn时，k(T(D))=2n-1.2。对任意非平凡强连通图D,k(T(D))≥Diam(D) 1。我们还证明了以上界是不可改进的最好界。     

Arc-transitive cubic cayley graphs on PSL(2, <Emphasis Type="Italic">p</Emphasis>)

For a prime p at least 5, let T = PSL(2, p). This paper gives a classification of the connected arc-transitive cubic Cayley graphs on T and a determination of the generated pairs (ā,−) of T such that o(ā) = 2 and o(−)= 3.     

保持理想的Grbner基的同态映射的一个有效判定方法

设Θ是k[x_1,x_2,…,x_n]上的自同态映射,>,>’分别是有理项序。本文刻划具有下列性质的同态映射Θ:对任意Grobner基G(关于项序>),G o Θ仍是Grobner基(关于项序>’),并且较好地解决了Hong的问题1。     

Eventual Right Disfocality on Time Scales

Eventual right disfocality of a dynamic equation y j j ( t )+ p 1 ( t ) y j ( t )+ p 2 ( t ) y ( t )=0, t ] T is established where T is a time scale. The results are obtained by imposing integrability conditions on p 1 and p 2 .     

`CH~2中齐性曲面的分类(英文)

ＣＨ~２中的曲面 Ｍ称为（局部）齐性的，如果对任何一对点 ｐ，ｑ，存在变换。 σ　Ｕ（１，２）把含ｐ的一个邻域变为含ｑ的邻域，且把ｑ变为ｑ．本文给出ＣＨ２中齐性曲面的完全分类．     

一类平面自仿射tiles的边界

考虑由扩张矩阵A=(?)及数字集D=(?):0≤i≤|p|-1,O≤j≤|q|一1(?)生成的自仿射tiles集T=T(A,D),其中p,q∈Z,|p|≥2,|q|≥2,通过对T中的元素进行分析,得到了计算T的边界的方法.     

On Extension of 1-Lipschitz Mappings between Two Unit Spheres of lp(Γ) Type Spaces (1

FANG Xi Nian 《数学研究与评论》2009,29(4)

Generalized o-minimality for partial orders

We consider partially ordered models. We introduce the notions of a weakly (quasi-)p.o.-minimal model and a weakly (quasi-)p.o.-minimal theory. We prove that weakly quasi-p.o.-minimal theories of finite width lack the independence property, weakly p.o.-minimal directed groups are Abelian and divisible, weakly quasi-p.o.-minimal directed groups with unique roots are Abelian, and the direct product of a finite family of weakly p.o.-minimal models is a weakly p.o.-minimal model. We obtain results on existence of small extensions of models of weakly quasi-p.o.-minimal atomic theories. In particular, for such a theory of finite length, we find an upper estimate of the Hanf number for omitting a family of pure types. We also find an upper bound for the cardinalities of weakly quasi-p.o.-minimal absolutely homogeneous models of moderate width.     

Continuity of Pseudo-differential Operators Associated with the Bessel Operator in Some Gevrey Spaces

The pseudo-differential operator (p.d.o) h w , a associated with the Bessel operator d 2 / dx 2 + (1 m 4 w 2 )/4 x 2 involving the symbol a ( x , y ) whose derivatives satisfy certain growth conditions depending on some increasing sequences, is studied on certain Gevrey spaces (ultradifferentiable function spaces). It is shown that the operator h w , a is a continuous linear map of one Gevrey space into another Gevrey space. A special p.d.o. called the Gevrey-Hankel potential is defined and some of its properties are investigated. A variant H w , a of h w , a is also discussed.     

Subgroups between special linear groups over a ring and its subring

All the subgroups between the special linear groups SL(n, o) and SL(n, o) are described in the following two cases: 1) o is a real-closed field, and o is its algebraic closure; 2) o is a Euclidean ring, and o is its quotient field.Translated from Matematicheskie Zametki, Vol. 6, No. 3, pp. 335–345, September, 1969.     

Arithmetic properties of the Ramanujan function

We study some arithmetic properties of the Ramanujan function τ(n), such as the largest prime divisorP (τ(n)) and the number of distinct prime divisors ω (τ (n)) of τ(n) for various sequences ofn. In particular, we show thatP(τ(n)) ≥ (logn)^33/31+o(1) for infinitely many n, and

代数Paranormal算子的谱

若任给x∈H,‖Tx‖~2≤‖T~2x‖·‖x‖,T∈B(H)称为是一个paranormal算子.T∈B(H)称为代数paranormal算子,若存在非常值复值多项式p,使得p(T)为para- normal算子.本文利用代数paranormal算子的谱集的特点,研究了代数paranormal算子以及该算子的拟仿射变换的Weyl型定理.     

最强Orlicz-Pettis拓扑

引进了lp（p≥1）空间的子集是本性紧概念,借此给出了抽象对偶系统（E,F）中最强Orlicz－Petits拓扑SOP（E,F）以及产生该拓扑的最大映射集族的表示．利用此结果搞清楚了现有两种Orlicz－Petits拓扑即Dierolf拓扑（M）和Twed－dle拓扑（E,T’）的确切意义以及它们之间的相互关系．指出了的最大性所蕴涵的理论意义和应用价值．证实了σ（F,E）-条件紧集和σ（F,E）-可数紧集都含于中。进而实质性地改进了矢位测度论中的Graves－Rness定理、抽象函数论中的Thomas定理等重要结果．     

迭代序列逼近非线性映像不动点集的一个几何结构

设E是Hilbert空间,T：D(T)→R(T)是E中具非空不动点集F(T)的非线性映像,许多非线性映像的多种形式的迭代序列{X_n}可逼近映像T的不动点p0∈F(T),并且逼近过程{X_n}与不动点集F(T)有密切的几何关系,其中一种几何关系可描述为钝角原理,其准确表述为lim sup_n→+∞〈p—p0,■〉■0,■p∈F(T)．或令θ_n(p)=arccos〈■〉,■p∈F(T)．钝角原理可表述为liminf_n→+∞θ_n(p)■π/2．在相应条件下,具有这种几何关系的非线性映像包括非扩张映像、渐近非扩张映像、Lipschitz映像、增生映像、伪压缩映像、渐近伪压缩映像、严格伪压缩映像、强伪压缩映像等大量非线性映像．钝角原理一方面可揭示非线性映像不动点逼近过程的几何结构,也是迭代逼近非线性映像不动点的必要条件．     

Determinants in Triangulated Categories

For a small triangulated category , Bass's K ₁ group is described, and the theorem of the heart is proved. We define the determinant map from to Neeman's , and we compute this map when is the derived category of an Abelian category .