Orlicz-Bochner序列空间的(K)性质

讨论Orlicz-Bochner序列空间的(K)性质,利用生成函数M及Orlicz-Bochner序列空间的性质,并在假设Banach空间X具有Schur性质的前提下,得到Orlicz-Bochner序列空间具有(K)性质的充要条件,进而得到Orlicz-Bochner序列空间具有弱不动点性质的一个充分条件.     

关于d-跟踪性质的一些注记

d-和d-跟踪性质是Dastjerdi和Hosseini为推广伪轨跟踪性质于2010年提出的.本文考察该动力性质在迭代系统和逆极限系统下的性质.首先证明对动力系统(X,f),以下三命题等价:(1)f具有d-跟踪性质(d-跟踪性质);(2)对任意k∈N,f~k也具有d-跟踪性质(d-跟踪性质);(3)存在k∈N,使得f~k具有d-跟踪性质(d-跟踪性质).进而证明具有d-跟踪性质的系统是链混合的.最后得到对于由{X_i,φ_i,f_i)_(i=1)~∞生成的逆极限系统(X_∞,f_∞),若每个f_i均具有d-跟踪性质(或者,d-跟踪性质,遍历跟踪性),则诱导映射f_∞也具有d-跟踪性质(相应地,d-跟踪性质,遍历跟踪性).     

测度中心的Mα-跟踪性质

本文证明如果动力系统具有周期M_α-跟踪性质或者周期M_α-跟踪性质,则其测度中心的限制系统也具有相同的跟踪性质.反之,如果动力系统在其测度中心的限制系统具有周期M_α-跟踪性质(或者,周期M_α-跟踪性质),则该动力系统具有周期M_β-跟踪性质(相应地,周期M_β-跟踪性质),对任意β∈[0,α).同时得到对等度连续系统,众多跟踪性质都等价于动力系统具有平凡的测度中心.     

逐点伪轨跟踪性质及其应用

本文给出紧致度量空间逐点伪轨跟踪性质的定义,该定义是伪轨跟踪性质定义的推广.作为应用,证明如下结论:(i)若f具有逐点伪轨跟踪性质,且对任意k∈Z ,fk为链转换的,那么对任意k∈Z ,fk为开集转换;(ii)若f具有逐点伪轨跟踪性质,且对任意n∈Z ,fn为链转换的,则f具有初始敏感依赖性质;(iii)若f为开集混合的,且具有逐点伪轨跟踪性质,那么f具有性质P;(iv)设f:(X,d)→(X,d)是同胚映射,那么f具有逐点伪轨跟踪性质当且仅当移位映射σf具有逐点伪轨跟踪性质.     

关于弱Specification性质的一个注记

该文证明具有弱specification性质的系统在其测度中心的限制系统也具有弱specification性质,并且其逆不真.作为推论得到在未有满射的假设下,弱specification性质蕴含渐近平均跟踪性质.最后证明具有弱specification性质的满射系统是一致分布混沌的.     

Weierstrass-Mandelbrot函数的非单调类性

非单调类性质在连续函数研究中起着重要作用．众所周知，Weierstrass函数具有非单调类性质．本文证明了Weierstrass-Mandelbrot型函数具有非单调类性质．     

具有性质（K）的C^＊—代数

本文讨论了具有性质(K)的 C~*—代数类的一些性质,它们与 C~*—代数扩张理论密切相关。我们证明了,性质(K)是稳定同构不变的;当 A、B 是具有单位元的 C~*—代数且A(?)B 具有性质(K)时,A 和 B 都具有性质(K);性质(K)关于理想、商是保持的。另外还证明了其它一些结果。     

一类具有弱无孔性质的c*-代数

证明了一类C~*-代数的弱无孔性质可以遗传到通过此类C~*-代数迹逼近后得到的C~*-代数中.同时证明了具有弱无孔性质的C~*-代数经过具有迹Rokhlin性质的有限群作用后得到的交叉积C~*-代数也具有弱无孔性质。     

拓扑线性空间中的Drop定理与Drop性质

给出了拓扑线性空间中的一个Drop定理.利用此Drop定理,证明了拓扑线性空间中的每个序列紧凸集具有Drop性质;每个可数紧闭凸集具有拟Drop性质.而且结出了拓扑线性空间中Drop性质和拟Drop性质的序列流特征.也讨论了Drop性质和拟Drop性质与泛函取极值之间的联系.     

相似抛物线的一组性质

文[1][2]分别讨论了相似椭圆和双曲线具有的性质,而所有的抛物线都是相似的,那么相似抛物线是否也具有类似的性质呢?笔者经过研究,发现相似抛物线也具有与文[2]中的定理3完全相同的性质.     

平均跟踪与伪轨跟踪

证明了紧致度量空间中有伪轨跟踪的distal同胚不具有平均跟踪性,并给出了有平均跟踪性的同胚是极小的一个充分条件。     

渐近纠缠算子单值扩张性质的等价性

算子T∈B(H)称作有单值扩张性质,若对任意一个开集U■C,满足方程(T-λI)f(λ)=0(λ∈U)的唯一的解析函数为零函数.显然,当int σ_p(T)=时,T有单值扩张性质,其中σ_p(T)为T的点谱.本文给出了渐近纠缠算子单值扩张性质的稳定性的等价条件,同时研究了2×2上三角算子矩阵的单值扩张性质的稳定性.     

上三角算子矩阵的单值延拓性质的摄动

设H为无限维可分的复Hilbert空间,B(H)为H上的有界线性算子全体.算子T∈B(H)称为具有单值延拓性质,若对任意一个开集U(?)C,满足方程(T-λI)f(λ)=0(任给λ∈U)的唯一的解析函数f:U→H为零函数;T∈B(H)称为满足单值延拓性质的稳定性,若对任意一个紧算子K∈B(H),T+K都满足单值延拓性质.本文给出了2×2上三角算子矩阵在紧摄动下满足单值延拓性质的稳定性的特征.     

Weak covering properties and selection principles

No convenient internal characterization of spaces that are productively Lindelöf is known. Perhaps the best general result known is Alster?s internal characterization, under the Continuum Hypothesis, of productively Lindelöf spaces which have a basis of cardinality at most _ℵ1${\aleph }_1$. It turns out that topological spaces having Alster?s property are also productively weakly Lindelöf. The weakly Lindelöf spaces form a much larger class of spaces than the Lindelöf spaces. In many instances spaces having Alster?s property satisfy a seemingly stronger version of Alster?s property and consequently are productively X, where X is a covering property stronger than the Lindelöf property. This paper examines the question: When is it the case that a space that is productively X is also productively Y, where X and Y are covering properties related to the Lindelöf property.     

序列伪轨跟踪性与拓扑可迁

给出序列伪轨跟踪性的定义,得到拓扑可迁的一个充分条件,并证明,若f是同胚,则f具有序列伪轨跟踪性当且仅当其逆极限空间上的移位映射σf具有序列伪轨跟踪性。     

Metrically regular mappings and its application to convergence analysis of a confined Newton-type method for nonsmooth generalized equations

Notion of metrically regular property and certain types of point-based approximations are used for solving the nonsmooth generalized equation f(x)+F(x)?0,where X and Y are Banach spaces,and U is an open subset of X,f:U→Y is a nonsmooth function and F:X■Y is a set-valued mapping with closed graph.We introduce a confined Newton-type method for solving the above nonsmooth generalized equation and analyze the semilocal and local convergence of this method.Specifically,under the point-based approximation of f on U and metrically regular property of f+F,we present quadratic rate of convergence of this method.Furthermore,superlinear rate of convergence of this method is provided under the conditions that f admits p-point-based approximation on U and f+F is metrically regular.An example of nonsmooth functions that have p-point-based approximation is given.Moreover,a numerical experiment is given which illustrates the theoretical result.     

Approximation and shape-preserving properties of q-Stancu operator

We introduce the definition of q-Stancu operator and investigate its approx- imation and shape-preserving property. With the help of the sign changes of f(x) and Ln = f ( f,q;x) the shape-preserving property of q-Stancu operator is obtained.     

Free Modules of Relative Invariants of Finite Groups

This paper addresses questions about when modules of relative invariants of a finite group G acting on a polynomial ring R are free over the ring of invariant polynomials R^G. A converse (first obtained by Shchvartsman) is proven of a result asserting that these modules are always free when the group is generated by pseudoreflections. We also re-prove the characterization given by Shchvartsman of which characters χ of degree one have the above property, and deduce from this a characterization of which G have the above property for all their degree one characters.     

具有渐近平均跟踪性质的系统

简记渐近平均跟踪性质为AASP.对于紧致度量空间上的连续映射f,证明了:(1)f有AASP当且仅当其逆极限空间上的移位映射有AASP;(2)若f有AASP且是等度连续的,则f是极小同胚.此外,讨论了AASP的拓扑共轭不变性.