与依测度收敛有关的若干反例

本文通过构造反例来进一步探究依测度收敛与处处收敛的关系，依测度收敛对乘法、除法、复合运算的封闭性，以及对可测集的可数可加性等性质.     

概率算子测度弱收敛的一个方法

本文给出一个新的概率算子测度弱收敛的充要条件。     

新序结构下函数列的伪依集值模糊测度收敛

在m维正欧氏空间中引入一种新序结构,并由此序结构在集值模糊测度空间上给出可测函数序列伪依集值模糊测度收敛、(伪)依集值模糊测度几乎处处收敛、PS性和PS'性等概念,进而研究了伪依模糊测度收敛和(伪)几乎处处收敛之间的关系,获得相应的Lebesgue定理和Riesz定理.     

单调集值测度空间上函数列依测度收敛的几个性质北大核心

首先给出了单调集值测度的S^(*)性质、集值双零渐近可加性等概念,然后在此基础上研究了单调集值测度空间上函数列依测度收敛的一些性质,并且得到了函数列依测度收敛的几个充分条件。     

拟特征标序列收敛的零一律与遍历测度的关系

本文讨论拟特征标序列收敛的零一律与遍历测度的关系,并且给出测度空间为拟连续的两个充要条件。     

紧拓扑半群上概率测度的简单半群及其支撑集

本文讨论一类拓扑半群上概率测度的极限性质．首先在紧半群上研究测度的简单半群和它的支撑集的相依关系;然后讨论测度的卷积幂ｕｎ收敛到Ｈａａｒｒ测度的充要条件．     

可换随机变量序列的弱收敛

本文讨论可换随机变量序列部分和适当正则化以后的一致稳定依分布收敛问题,求出了在这种收敛意义下的全部极限混合分布函数。给出了收敛的充要条件。     

H-值半鞅测度的弱收敛

本文引进了H-值半鞅测度，研究了其基本性质和与之相联系的随机积分，本文还引入了H-值半鞅测度序列依分布弱收敛的概念，建立了H-值半鞅测度的极限定理，给出了H-值半鞅测度弱收敛的条件。     

关于可测函数列各种收敛性的几点注记

关于可测函数列的收敛性．除了众所周知的处处收敛、一致收敛、几乎处处收敛外，尚有依测度收敛、平均收敛和弱收敛等．本文将主要讨论它们之间的相互关系。     

一个具有可测数据的化学反应扩散系统

该文证明一个化学反应扩散系统当初始数据是有界非负犚犪犱狅狀测度时弱解整体存在,且给出了解收敛于正平衡解的充要条件．     

覆盖空间及粗糙集与拓扑的统一

引入覆盖空间,定义了其邻域、内部、闭包、测度等概念,研究了它们的性质.得出了粗糙集近似空间和拓扑空间都是具体覆盖空间的重要结论,从而用覆盖空间统一了粗糙集和拓扑.利用覆盖空间,得到了粗糙集和拓扑中更深刻的性质,从算子论和集合论的角度丰富和深化了粗糙集与拓扑的内容.     

On Sets of Measurable Operators Convex and Closed in Topology of Convergence in Measure

For a von Neumann algebra with a faithful normal semifinite trace, the properties of operator “intervals” of three types for operators measurable with respect to the trace are investigated. The first two operator intervals are convex and closed in the topology of convergence in measure, while the third operator interval is convex for all nonnegative operators if and only if the von Neumann algebra is Abelian. A sufficient condition for the operator intervals of the second and third types not to be compact in the topology of convergence in measure is found. For the algebra of all linear bounded operators in a Hilbert space, the operator intervals of the second and third types cannot be compact in the norm topology. A nonnegative operator is compact if and only if its operator interval of the first type is compact in the norm topology. New operator inequalities are proved. Applications to Schatten–von Neumann ideals are obtained. Two examples are considered.     

The extension and completion of the universal measure and the dual of the space of measures

Every vector measure μ factors uniquely by μ = $\text{}\text{?}$gm ° χ where χ is a universal measure and $\text{}\text{?}$gm is a linear map continuous on simple functions in the strict topology. The completion of χ describes the dual of the space of measures by uniform closure based on χ-measurable sets and also as the completion of the simple functions in the strict topology.     

A note on the space of fuzzy measurable functions for a monotone measure

In this paper, we give a necessary and sufficient condition to guarantee that the space of all finite measurable functions for a monotonic measure is a topological vector space with a countable local base and in this space convergence with respect to this topology is equivalent to the convergence in measure.     

Convergence in distribution of random metric measure spaces (Λ-coalescent measure trees)

We consider the space of complete and separable metric spaces which are equipped with a probability measure. A notion of convergence is given based on the philosophy that a sequence of metric measure spaces converges if and only if all finite subspaces sampled from these spaces converge. This topology is metrized following Gromov’s idea of embedding two metric spaces isometrically into a common metric space combined with the Prohorov metric between probability measures on a fixed metric space. We show that for this topology convergence in distribution follows—provided the sequence is tight—from convergence of all randomly sampled finite subspaces. We give a characterization of tightness based on quantities which are reasonably easy to calculate. Subspaces of particular interest are the space of real trees and of ultra-metric spaces equipped with a probability measure. As an example we characterize convergence in distribution for the (ultra-)metric measure spaces given by the random genealogies of the Λ-coalescents. We show that the Λ-coalescent defines an infinite (random) metric measure space if and only if the so-called “dust-free”-property holds.     

基于Web挖掘和站点拓扑的自适应网站研究

针对当前自适应网站实现领域研究的不足,尤其是缺乏对网站自身拓扑结构的分析,站在用户的角度,结合Web日志挖掘和站点拓扑分析,提出地标系数这一指标来衡量网站结点的重要性.在此基础上,提出自适应网站的实现架构,并给出智能推荐(包括高亮显示和动态地图)和缓冲预取两种自适应策略.最后,对一个原型系统进行实验分析.结果表明,提出的自适应策略可提高网站访问者的访问效率.     

测度中心为单点集的强拓扑混合系统

本文用构造性的方法证明了存在强拓扑混合的紧致系统,其测度中心是单点集.从而说明了拓扑混合的系统在拓扑的观点下是复杂的,但在遍历的意义下却可能是简单的.     

Analysis and Prbability over Infinite Extensions of a Local Field

We consider an infinite extension K of a local field of zero characteristic which is a union of an increasing sequence of finite extensions. K is equipped with an inductive limit topology; its conjugate K; is a completion of K with respect to a topology given by certain explicitly written semi-norms. We construct and study a Gaussian measure, a Fourier transform, a fractional differentiation operator and a cadlag Markov process on K. If we deal with Galois extensions then all these objects are Galois-invariant.     

Multidimensional and Multivalued Ergodic Theorems for Measure-Preserving Transformations

The aim of this paper is to establish some multidimensional and multivalued Birkhoff’s ergodic theorems for measure preserving transformations. Two types of convergence will be considered: Mosco convergence and convergence in the gap topology. Some illustrative examples are provided.     

A category analogue of the density topology non-homeomorphic with the $$\mathcal {I}$$ I -density topology

Positivity - The paper deals with the category analogue of a density point and a density topology (with respect to a Lebesgue measure) on the real line which is different from the $$\mathcal {I}$$...