Hilbert空间H中带符号广义框架的一个刻画

本文研究了可分的Hilbert空间H中带符号广义框架,利用算子理论方法,给出了H中一族向量{hm}m∈M是一个带符号广义框架当且仅当带符号广义框架的框架算子的正部S 和负部S-是有界线性算子,讨论了H中带符号广义框架的框架算子S的可逆性,并且得到了H中每个向量f关于带符号广义框架{hm}m∈M和其对偶带符号广义框架{~hm}m∈M的表示式.     

ON THE GENERALIZED RESOLVENT OF LINEAR PENCILS IN BANACH SPACES

Utilizing the stability characterizations of generalized inverses of linear operator, we investigate the existence of generalized resolvent of linear pencils in Banach spaces. Some practical criterions for the existence of generalized resolvents of the linear pencil λ→ T λ S are provided and an explicit expression of the generalized resolvent is also given. As applications, the characterization for the Moore-Penrose inverse of the linear pencil to be its generalized resolvent and the existence of the generalized resolvents of linear pencils of finite rank operators, Fredholm operators and semi-Fredholm operators are also considered. The results obtained in this paper extend and improve many results in this area.     

THE COMPACTNESS OF A KIND OF GENERALIZED HANKEL OPERATORS ON THE BERGMAN SPACE OF THE UNIT BALL

This paper gives the compactness criteria for a kind of generalized Hankel operators on Bergman spaces Lpa(B) defined by M.M.Peloso.     

用线性算子定义的亚纯P叶函数子类(英文)

本文引进用算子定义的亚纯 p叶函数新子类 ,建立了包含关系 ,讨论了类中函数的积分算子性质 ,所得结果拓广了 [2 ]、[3 ]、[4]、[5 ]中的相应结果 .     

REALIZATION OF PEETRE K-MODULUS ON THE SPHERE

1IntroductionandNotationsLetfi={p=(x,yiz)ER3,IPI=1}betheunitsphereintheEuclideanspaceR3.ByC(O)andLP(O),1SP相似文献   

锥中与稳态的薛定谔算子相关的广义Martin函数无穷远处的控制

本文研究了稳态的薛定谔算子的Dirichlet问题和Martin函数的边界行为.利用广义Martin表示和稳态的薛定谔算子对应的常微分方程基本解,在具有光滑边界的锥形区域中获得了与稳态的薛定谔算子相关的广义Martin函数无穷远处广义调和控制的一些刻画,推广了拉普拉斯算子情形的结果.     

带共轭且带平移的变系数奇异积分方程组的封闭形式解

本文讨论了一类带轭且带平和多的变系数奇异积分方程组，在一些补充假定下，利用化为四元素边值问题的方法，得到了所求方程级数形式的解和积分形式的可解条件。     

一类解析算子函数空间上的复合算子

本文用算子函数论的方法，研究了解析算子函数的Banach空间X，X0上的复合算子．给出此复合算子为有界的条件，并刻划了此复合算子在X0上为紧的特征．     

一般矩阵函数的不等式

本文研究一般矩阵函数不等式.运用一般矩阵函数的两个公式和lp-范数的性质,结出了两个矩阵运算的一般矩阵函数不等式.     

带税率的Cramér-Lundberg风险模型的总征税次数的分布函数(英文)

本文研究了带税率的Cramér-Lundberg风险模型.利用迭代算法及该过程具有的的强马氏性,得出了保险公司从开始营运到破产期间总赋税次数的概率函数.作为例子,本文给出了指数分布索赔假定下该概率函数的具体表达式.     

一个算子迹的不等式

本文讨论Bellman不等式的相关问题,利用紧算子的极表示以及陈公宁的一个矩阵迹的不等式,得到算子迹的相应不等式.作为其推论,在无穷维Hilbert空间中给出了Bellman问题的一个肯定回答.     

Equivalence of <Emphasis Type="Italic">K</Emphasis>-functionals and modulus of smoothness constructed by generalized Dunkl translations

In a Hilbert space L _2,α := L ₂(?, |x|^2α+1 dx), α > ? 1/2, we study the generalized Dunkl translations constructed by the Dunkl differential-difference operator. Using the generalized Dunkl translations, we define generalized modulus of smoothness in the space L _2,α . Based on the Dunkl operator we define Sobolev-type spaces and K-functionals. The main result of the paper is the proof of the equivalence theorem for a K-functional and a modulus of smoothness.     

COMMUTATORS OF GENERALIZED HARDY OPERATORS ON HOMOGENEOUS GROUPS

Let G be a homogeneous group. The author considers the boundedness of commutators generated by the generalized Hardy operators and CMO（G） functions on Herz spaces in the setting of homogeneous group. This article extends some known results.     

ON THE CAUCHY PROBLEM OF TRANSPORTATION EQUATIONS

1.IntroductionInthepreselltpaper,weconsiderthetransportationsystemwithinitialdatawherepanduaredensityandvelocityrespectively.Thesystemofconservationlaws(1.1)describesthefluidmechanicswithconstalltpressuxe,whichisusedinplasmaphysicswherepressureisassumedtobeaconstant.Thissystemisnon--strictlyhyperbolicwithadoubleeigenvalueAl~AZ=albothAl,AZbeinglinearlydegenerate.AndtheCauchyproblemforthissystemisnotwell-posedintheclassofmeasurableandboundedfunctions(see[3]).Inthepresentpaper,weintroduceanew…     

推广的生长曲线模型中未知参数矩阵的广义最小二乘估计的可容许性

本文在设计矩阵与结构矩阵分别正交的条件下,研究了推广的生长曲线模型未知参数矩阵的广义最小二乘估计.运用矩阵理论证明了此广义最小二乘估计在某个线性估计类中的可容许性.并对潘建新(1989)的结果的推广.     

关于非线性共同逼近的强唯一性

本文首先指出文献［１］中的一个错误，举例说明弱拟凸集的最佳逼近未必具有广义强唯一性，进而讨论两类共同逼近的强唯一性，在空间是一致凸、逼近集是共同太阳集的条件下，证明了最佳共同逼近具有广义强唯一性     

ASYMPTOTICS FOR POSITIVE SOLUTIONS OF THE WEIGHTED LAPLACE EQUATIONS INVOLVING CRITICAL GROWTH

1IntroductionConsiderthefollowingproblemwl1ereflCR",n23,isaboundeddomainwithsmoothboundarycontainingtheorigin.TheexponentscrjP,rrandpsatisfyItisknownthatthefollowillgS(i1)'llf'v-Hardyinequalityholdsifandonlyif(1.2)issatisfied(cL[4])foralluECj(R"),theconstantS(cr,P)seebelow(1.5).Weshallbeconcernedwiththecasesp5o,p 1>2andcrta>P-2.DenotebyHt(fl)thespaceofcompletionofCi(fl)undertheinnerproduct(u,v)=jnlxld7u'7l)dx.uEH:(fl)iscalledaweaksolutionof(1-1)iff0rallvEHt(fl).Ithasbeeushownin[5]thata…     

AN UPPER BOUND OF THE ESSENTIAL NORM OF COMPOSITION OPERATORS BETWEEN WEIGHTED BERGMAN SPACES

In this paper, we define the generalized counting functions in the higher dimensional case and give an upper bound of the essential norms of composition operators between the weighted Bergman spaces on the unit ball in terms of these counting functions. The sufficient condition for such operators to be bounded or compact is also given.     

关于广义Jacobi权的Lebesgue函数的估计

本文证明了由广义Ｊａｃｏｌｂｉ权产生的Ｌｅｂｅｓｇｕｅ函数在（－１,１）中任意固定内闭区间τ上的估计为Ｏ（ｌｎｎ）,这个结果改进了「３」中在一般抽象权时给出的结论     

ON THE EXISTENCE OF MAXIMAL LIKELIHOOD ESTMATORS

In this paper, we give necessary and sufficient for the existence of maximal likelihood estimators when the density functions of probability distributions are product measurable. We also show that when we adopt the generalized definition of maximal likelihood estimators, the generalized maximal likelihood estimators always exist,provide the denesity functions are product measurable.