A New Class of Banach Spaces with Uniform Normal Structure

§ 1.Ｉｎｔｒｏｄｕｃｔｉｏｎ　ＬｅｔＸｂｅａｎｏｒｍｅｄｌｉｎｅａｒｓｐａｃｅ ,ａｎｄｌｅｔＳ(Ｘ) ={ｘ∈Ｘ :ｘ =1 }ｂｅｔｈｅｕｎｉｔｓｐｈｅｒｅｏｆＸ .Ｉｎ 1 94 8,ＢｒｏｄｓｋｉｉａｎｄＭｉｌｍａｎ[1]ｉｎｔｒｏｄｕｃｅｄｔｈｅｆｏｌｌｏｗｉｎｇｇｅｏｍｅｔｒｉｃｃｏｎｃｅｐｔ:　Ｄｅｆｉｎｉｔｉｏｎ 1　ＡＢｏｕｎｄｅｄ ,ｃｏｎｖｅｘｓｕｂｓｅｔＫｏｆａＢａｎａｃｈｓｐａｃｅＸｉｓｓａｉｄｔｏｈａｖｅｎｏｒｍａｌｓｔｒｕｃｔｕｒｅｉｆｅｖｅｒｙｃｏｎｖｅｘｓｕｂｓｅｔＨｏｆＫｔｈａｔｃｏｎｔａ…     

The Drazin Inverse of a Morphism with a Sequence of (epic, monic) Factorizations

§ 1.Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｉｎ [1 ],ｔｈｅａｕｔｈｏｒｄｅｆｉｎｅｄａｃｃｕｒａｔｅｌｙｔｈｅＤｒａｚｉｎｉｎｖｅｒｓｅｏｆａｍｏｒｐｈｉｓｍ .Ｐｒｅｖｉｏｕｓｌｙ ,ｓｏｍｅｎｅｃｅｓｓａｒｙａｎｄｓｕｆｆｉｃｉｅｎｔｃｏｎｄｉｔｉｏｎｓｗｅｒｅｏｂｔａｉｎｅｄｆｏｒａｍｏｒｐｈｉｓｍｗｉｔｈ (ｅｐｉｃ ,ｍｏｎｉｃ)ｆａｃｔｏｒｉｚａｔｉｏｎｔｏｈａｖｅｔｈｅｇｒｏｕｐｉｎｖｅｒｓｅ (ｓｅｅ [2 ],Ｔｈｅｏｒｅｍ 1 )ａｎｄｔｈｅＤｒａｚｉｎｉｎｖｅｒｓｅｏｆａｍａｔｒｉｘｏｖｅｒｔｈｅｃｏｍｐ…     

Note on Reflexive Algebras with Non—distributive Invariant Lattices

§０．　ＩｎｔｒｏｄｕｃｔｉｏｎＬｅｔＬｂｅａｃｏｌｌｅｃｔｉｏｎｏｆｃｌｏｓｅｄｓｕｂｓｐａｃｅｓｏｆａＨｉｌｂｅｒｔｓｐａｃｅＨｃｏｎｔａｉｎｉｎｇ｛０｝ａｎｄＨｗｈｉｃｈｆｏｒｍｓａｃｏｍｐｌｅｔｅｓｕｂｓｐａｃｅｌａｔｔｉｃｅｕｎｄｅｒｔｈｅｏｐｅｒａｔｉｏｎｓ∧（ｉｎｔｅｒｓｅｃｔｉｏｎ）ａｎｄ∨（ｃｌｏｓｅｄｌｉｎｅａｒｓｐａｎ）．ＷｅｄｅｎｏｔｅｂｙａｌｇＬｔｈｅａｌｇｅｂｒａｏｆａｌｌｂｏｕｎｄｅｄｌｉｎｅａｒｏｐｅｒａｔｏｒｓｗｈｉｃｈｌｅａｖｅａｌｌｓｕｂｓｐａｃｅｓｉｎＬｉ…     

ON THE STRUCTURES OF RANDOM MEASURE AND POINT PROCESS CONVOLUTION SEMIGROUPS

§0.ＩｎｔｒｏｄｕｃｔｉｏｎＫｅｎｄａｌｌ[1]ｆｏｕｎｄｅｄｔｈｅＤｅｌｐｈｉｃｓｅｍｉｇｒｏｕｐｔｈｅｏｒｙａｎｄｕｓｅｄｔｈｉｓｔｈｅｏｒｙｔｏｓｔｕｄｙｔｈｅｓｔｒｕｃｔｕｒｅｓｏｆｔｈｅｒｅｎｅｗａｌｓｅｑｕｅｎｃｅｓｅｍｉｇｒｏｕｐａｎｄｔｈｅｓｔａｎｄａｒｄｐ-ｆｕｎｃｔｉｏｎｓｅｍｉｇｒｏｕｐ.Ｄａｖｉｄｓｏｎ[2,3],ＲｕｚｓａａｎｄＳｚ啨ｋｅｌｙ[4]ａｎｄＨｅ[5,6]ｇｅｎｅｒａｌｉｚｅｄｔｈｅＤｅｌｐｈｉｃｓｅｍｉｇｒｏｕｐｔｈｅｏｒｙａｎｄｕｓｅｄｔｈｅｉｒｒｅｓｕｌｔｓｔｏｓｔｕｄ…     

Gamma Functions and Siegel Integrals on Nonselfdual Cones

Ｉｎｔｈｅｐａｐｅｒ［１］,ＹｉｎＷｅｉｐｉｎｇｉｎ１９８１ｏｂｔａｉｎｅｄＧａｍｍａｆｕｎｃｔｉｏｎｓａｎｄＳｉｅｇｅｌｉｎｔｅｇｒａｌｓｏｎｎｏｎｓｅｌｆｄｕａｌｃｏｎｅｓＶＩＩｍ１,…,ｍｓ１,ｓａｎｄＶＩＩｍ１,…,ｍｓ１,ｓ,　　Ｉｎｔｈｉｓｐａｐｅｒ,ｗｅｗｉｌｌｄｅｆｉｎｅＧａｍｍａｆｕｎｃｔｉｏｎｓａｎｄＳｉｅｇｅｌｉｎｔｅｇｒａｌｓｏｎｎｏｎｓｅｌｆｄｕａｌｃｏｎｅｓＶＩＩｍ１,…,ｍｓ１３,ｓａｎｄＶＩＩｍ１,…,ｍｓ１３,ｓ．ＴｈｅｎｏｂｔａｉｎＣａｕｃｈｙ－Ｓｚｅｇｏ…     

EXISTENCE TIME FOR THE SEMILINEAR SCHR?DINGER EQUATION

§ 1　ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｈｉｓｐａｐｅｒ ,ｗｅｗｉｌｌｃｏｎｓｉｄｅｒｔｈｅｓｅｍｉｌｉｎｅａｒＳｃｈｒ ｄｉｎｇｅｒｅｑｕａｔｉｏｎｉｎｏｎｅｓｐａｃｅｄｉｍｅｎｓｉｏｎｏｆｔｈｅｔｙｐｅｕｔ-ｉｕｘｘ =Ｆ(ｕ) .　 (ｘ ,ｔ)∈Ｒ×Ｒ+,( 1 )ｕ(ｘ ,0 ) =ｕ0 ,　ｘ ∈Ｒ ,( 2 )ｗｈｅｒｅｕ =ｕ(ｘ ,ｔ)ｉｓｃｏｍｐｌｅｘ ｖａｌｕｅｄｆｕｎｃｔｉｏｎ ,ａｎｄＦｉｓａｓｍｏｏｔｈｆｕｎｃｔｉｏｎｏｆｕｓｕｃｈｔｈａｔ｜Ｆ(ｕ) ｜ =Ｏ( ｜ｕ｜α+1)ｆｏｒ |ｕ|ｓｕｆｆｉｃｉｅｎｔｌｙｓｍａｌｌａｎｄ…     

The Hausdorff Measure Theoretic Entropy of a Subshift in Symbolic Space

Ｉｎ [1 ]ａｎｄ [2 ]Ｘｉｏｎｇｉｎｔｒｏｄｕｃｅｄａｆｒａｃｔａｌｔｈｅｏｒｙｉｎｔｏｄｙｎａｍｉｃａｌｓｙｓｔｅｍｒｅｓｅａｒｃｈ ,ｍｅａｓｕｒｅｄｃｈａｏｔｉｃｓｅｔｓｗｉｔｈｔｈｅＨａｕｓｄｏｒｆｆｄｉｍｅｎｓｉｏｎａｎｄｔｈｅＨａｕｓｄｏｒｆｆｍｅａｓｕｒｅ .ＺｈｏｕｅｓｔｉｍａｔｅｄｔｈｅＨａｕｓｄｏｒｆｆｍｅａｓｕｒｅｏｆｆｉｎｉｔｅｔｙｐｅｓｕｂｓｅｔｉｎ [3].Ｉｎｔｈｉｓｐａｐｅｒ ,ｔｈｅＨａｕｓｄｏｒｆｆｍｅａｓｕｒｅｔｈｅｏｒｅｔｉｃｅｎｔｒｏｐｙｏｆａｓｕｂｓｈｉｆｔｉｎｓ…     

Conesin Integrable Vector Valued Function SpacesandAbstractImpulsiveIntegro┐diferentialEquations

ＣｏｎｅｓｉｎＩｎｔｅｇｒａｂｌｅＶｅｃｔｏｒＶａｌｕｅｄＦｕｎｃｔｉｏｎＳｐａｃｅｓａｎｄＡｂｓｔｒａｃｔＩｍｐｕｌｓｉｖｅＩｎｔｅｇｒｏ┐ｄｉｆｅｒｅｎｔｉａｌＥｑｕａｔｉｏｎｓ＊）ＬｉｕＷｅｉａｎ（刘伟安）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍ...     

Synthetic estimation on substantial Costs of Productions

ＳｙｎｔｈｅｔｉｃｅｓｔｉｍａｔｉｏｎｏｎｓｕｂｓｔａｎｔｉａｌＣｏｓｔｓｏｆＰｒｏｄｕｃｔｉｏｎｓ￥ＺｈａｎｇＧｕｏ－ｓｈｅｎｇ（ｎｏｒｔｈＣｈｉｎａＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ，Ｂｅｉｊｉｎｇ，１０００４１）Ａｂｓｔｒａｃｔ：Ｉｎ...     

Finite Rank Operators in Closed Maximal Triangular Algebras

Ｆｉｎｉｔｅｒａｎｋｏｐｅｒａｔｏｒｓａｎｄｒａｎｋｏｎｅｏｐｅｒａｔｏｒｓａｒｅｉｍｐｏｒｔａｎｔｔｏｔｈｅｔｈｅｏｒｙｏｆｎｅｓｔａｌｇｅｂｒａｓ .Ｉｎａｎｅｓｔａｌｇｅｂｒａ ,ｅａｃｈｆｉｎｉｔｅｒａｎｋｏｐｅｒａｔｏｒｃａｎｂｅｗｒｉｔｔｅｎａｓａｆｉｎｉｔｅｓｕｍｏｆｒａｎｋｏｎｅｏｐｅｒａｔｏｒｓｗｈｉｃｈｂｅｌｏｎｇｔｏｉｔｓｅｌｆ (Ｔｈｉｓｒｅｓｕｌｔｉｓｉｎ [1 ],ｂｕｔｂｅｌｏｎｇｓｔｏＪ .Ｒ .Ｒｉｎｇｒｏｓｅ) .Ｉｎａｎａｔｕｒａｌｗａｙ ,ｗｅｍａｙａｓｋ :　Ｑｕｅｓｔｉｏｎ…     

近似凸集的某些性质

主要研究了两类近似凸集的关系和性质.首先,举例说明两类近似凸集没有相互包含关系.其次,在近似凸集(nearly convex)条件下,证明了在一定条件下函数上图是近似凸集与凸集的等价关系.同时,考虑了近似凸函数与函数上图是近似凸集的等价刻画、近似凸函数与函数水平集是近似凸集的必要性,并用例子说明近似凸函数与函数水平集是近似凸集的充分性不成立.最后,基于近似凸函数和拟凸函数的概念,给出了近似拟凸函数的概念并研究了近似拟凸函数与水平集是近似凸集的等价刻画.     

数有根近2-正则平面地图

The number of rooted nearly 2-regular maps with the valency of root-vertex, the number of non-rooted vertices and the valency of root-face as three parameters is obtained. Furthermore, the explicit expressions of the special cases including loopless nearly 2-regular maps and simple nearly 2-regular maps in terms of the above three parameters are derived.     

凸性与度量投影的连续性

本文研究近强凸、近非常凸Banach空间中度量投影的连续性。获得如下结果：若A是近强凸（近非常凸）空间中的逼近凸集,则度量投影PA是范-范上半连续的（范-弱上半连续的）。此外,我们还利用度量投影的连续性给出Banach空间为近强凸、近非常凸的一些充分必要条件。     

L－fuzzy拓扑空间中的近似良紧性

本文系统地研究了Ｌ－ｆｕｚｚｙ拓扑空间中近似良紧性的特征及其拓补性质。讨论了近似良紧性与良紧性之间的关系。证明了近似良紧性是正则闭遗传的，有限可和的以及在满层的Ｌ—ｆｕｚｚｙ拓扑空间中，对于近似良紧性而言，ＸＯＨＯＢ乘积定理成立等重要性质。     

Dualities between Almost Completely Decomposable Groups and their Endomorphism Rings

We prove that endomorphism rings of nearly isomorphic, almost completely decomposable groups of ring type are also nearly isomorphic as additive structures. On this basis, acd groups can be considered in a dual connection with their endomorphism rings. __________ Translated from Sovremennaya Matematika i Ee Prilozheniya (Contemporary Mathematics and Its Applications), Vol. 13, Algebra, 2004.     

Stochastic Differential Games With a Small Parameter

Much of stochastic game theory is concerned with diffusion models. Such models are often only idealizations of the actual physical process, which might be driven by a wide bandwidth process or be a discrete parameter system with correlated driving noises. For a two person zero-sum game, under quite general conditions, the optimal or nearly optimal strategies derived for the diffusion model are shown to be “nearly optimal” for the physical (say wideband noise driven) process. An approach based on occupation measures are used. We treat the problem of discounted cost, as well as the average cost per unit time problem. Weak convergence methods are utilized in the analysis     

On optimal trees

The merits of different shapes of trees as data storage structures are compared. Given a tree data structure, the worst-case cost of searching the tree is studied, under weak assumptions about the cost of searches. In particular, it is assumed that the cost of a search path is the sum of the costs of the nodes on it, and that the cost of a node depends only on the outdegree of that node. The main results of the paper are that there are regular trees (as defined in the paper) which are nearly optimal among trees with a given number of nodes, and that minimal-cost trees are often nearly regular.     

LF-拓扑空间的良拟紧性

在LF-拓扑空间中证明了拟紧的推广良拟紧对于正则闭子集是可遗传的并且是L-好的推广.在LF-半正则空间中得到了良拟紧性等价于良紧性.     

A method for separating nearly multiple eigenvalues for Hermitian matrix

In this paper, we propose a numerical method to verify for nearly multiple eigenvalues of a Hermitian matrix not being strictly multiple eigenvalues. From approximate eigenvalues computed, it seems to be difficult to distinguish whether they are strictly multiple eigenvalues or simple ones, and if they are very close each other, the verification method for simple eigenvalues may fail to enclose them separately, because of singularity of the system in the verification. There are several methods for enclosing multiple and nearly multiple eigenvalues (e.g., [Rump, Computational error bounds for multiple or nearly multiple eigenvalues, Linear Algebra Appl. 324 (2001) 209–226]), For such cases, there is no result to decide the enclosed eigenvalues are nearly multiple or strictly multiple, up to now. So, for enclosed eigenvalues, we propose a numerical method to separate nearly multiple eigenvalues.     

Orlicz空间的近端点和近严格凸性

本文给出了Orlicz函数空间中近端点的判别准则,近而推出了Orlicz函数空目近严格凸性的判别准则.另外,本文还直接给出Orlicz序列空间近严格凸的判别准则.