正则Dirichlet子空间与Mosco收敛性

讨论了一维不可约强局部Dirichlet,型的正则子空间的Mosco收敛性.如果正则子空间的特征集是收敛的,那么相应的正则子空间在Mosco意义下也是收敛的.最后,用一些具体的例子说明了Mosco收敛不能保持Dirichlet型整体特性的稳定.     

Dirichlet空间上的紧算子

若S是Dirichlet空间上有限个Toeplitz算子乘积的有限和, S为紧算子的充要条件是: 当z→∂D时, S的Berezin型变换收敛到0; 若S是Dirichlet空间上Hankel算子, S为紧算子的充要条件是: 当z→ D时, S作用在类再生核上按范数收敛到0.     

零理想边界的素端上某类椭圆型方程的非负解

考虑具有零理想边界的非紧镶边Riemann曲面Ω=Ω∪ aΩ及其上的Dirichlet积分有限的非负局部Holder连续的二重共变量P.用F表示方程△u=Pu在aΩ取极限值0的非负连续解全体.本文讨论拟Picard原理成立的充要条件并证明若Ω的每一理想边界点都有端邻域满足广义Heins条件,则Martin函数全体所成之集是F中的极小正解全体所支撑的子半线性空间P的一个Hamel基,而且F可表示为与P相关的直和形式.     

R~n上扩散过程的代数式收敛

本文研究n维欧氏空间上的扩散过程在L2意义下的代数式收敛的情况,给出了判定代数式收敛的方法,并对两种特殊情形扩散算子进行了讨论.将所得判敛法应用于两个例子可得到精确的结果.     

最小Q-过程中断时Martin流出边界与Ray-Knight紧化的关系

在最小Q-过程中断条件下证明了Martin流出边界与Ray-Knight紧化之间存在一定的映射关系.并举例说明如果最小Q-过程中断且无限流出,则Ray-Knight紧化可能比Martin流出边界要多出一些点.因此在Markov链的构造论中不能只考虑Martin边界.     

一种求解两两合作轮流博弈问题的混合分裂算法

提出了一种求解两两合作轮流博弈的四人博弈问题的混合分裂算法.为了模拟实际博弈过程,该算法由两个组内平行分裂算法和一个组间交替极小化算法构成.算法允许对博弈子问题非精确求解,反映了实际博弈中参与人的有限理性,即允许参与人在博弈过程中出现满足一定条件的误差.在适当条件下,证明了所提出的混合分裂算法全局地收敛到所考虑博弈的Nash平衡.     

Dirichlet过程的弱收敛

利用Dirichlet型的方法研究Markov过程的弱收敛,得到一般度量空间上Hunt过程弱收敛的两个定理.作为应用,给出有限维和无限维空间上对称或非对称Dirichlet过程弱收敛的例.     

紧李群上方体求和的几乎处处收敛与多复变域R_1的Cauchy积分与Dirichlet问题

本文讨论了紧李群上Fourier级数的方体平均求和的几乎处处收敛问题,并用这一结果,讨论了多复变数典型域R_1上Cauchy型积分的边界性质与Dirichlet问题.     

有限个广义渐近非扩张映射具误差的复合隐迭代过程

在一致凸Banach空间研究了一个新的有限个广义渐近非扩张映射具误差的复合隐迭代过程.利用空间满足Opial条件和算子满足半紧性条件,我们证明了这个隐迭代过程强、弱收敛于有限个广义渐近非扩张映射的公共不动点.这些结果是目前所得成果的完善和推广.     

Dirichlet型空间上Toeplitz算子的本性范数

本文研究单位圆盘上Dirichlet型空间非紧Toeplitz算子的本性范数, 它事实上等于到紧Toeplitz算子集的距离. 并且这个距离可由无限多个紧Toeplitz算子来刻画, 这个结果与加权Bergman空间情形的类似.     

The Problem of Eigenvalue on Noncompact Complete Riemannian Manifold

Let M be an n-dimensional noncompact complete Riemannian manifold, "Δ" is the Laplacian of M. It is a negative selfadjoint operator in L²(M). First, we give a criterion of non-existence of eigenvalue by the heat kernel. Applying the criterion yields that the Laplacian on noncompact constant curvature space form has no eigenvalue. Then, we give a geometric condition of M under which the Laplacian of M has eigenvalues. It implies that changing the metric on a compact domain of constant negative curvature space form may yield eigenvalues.     

概复齐性空间

<正> 实向量空间V上的一个线性变换I,如果合于I~2=-E(E是么变换),则称I为V上的一个复结构.易知:存在复结构的实向量空间维数必定是偶数,并且可以视为复向量空间.事实上,命     

Hitchin-Thorpe inequality for noncompact Einstein 4-manifolds

We prove a Hitchin-Thorpe inequality for noncompact Einstein 4-manifolds with specified asymptotic geometry at infinity. The asymptotic geometry at infinity is either a cusp bundle over a compact space (the fibered cusps) or a fiber bundle over a cone with a compact fiber (the fibered boundary). Many noncompact Einstein manifolds come with such a geometry at infinity.     

Central limit theorems for the radial spanning tree

Consider a homogeneous Poisson point process in a compact convex set in d‐dimensional Euclidean space which has interior points and contains the origin. The radial spanning tree is constructed by connecting each point of the Poisson point process with its nearest neighbour that is closer to the origin. For increasing intensity of the underlying Poisson point process the paper provides expectation and variance asymptotics as well as central limit theorems with rates of convergence for a class of edge functionals including the total edge length. © 2016 Wiley Periodicals, Inc. Random Struct. Alg., 50, 262–286, 2017     

LOCAL COMPACTNESS IN SEMI-UNIFORM CONVERGENCE SPACES

Abstract

Local compactness is studied in the highly convenient setting of semi-uniform convergence spaces which form a common generalization of (symmetric) limit spaces (and thus of symmetric topological spaces) as well as of uniform limit spaces (and thus of uniform spaces). It turns out that it leads to a cartesian closed topological category and, in contrast to the situation for topological spaces, the local compact spaces are exactly the compactly generated spaces. Furthermore, a one-point Hausdorff compactification for noncompact locally compact Hausdorff convergence spaces is considered.¹     

Approximation of analytical functions by k-positive linear operators in the closed domain

This work treats the problem of convergence for the sequences of linear \(k\) -positive operators on a space of functions that are analytic in a closed domain. By convergence in this space, we mean a uniform convergence in a closed domain that contains the original domain strictly inside itself, while the linear \(k\) -positive operators are naturally associated with Faber polynomials related to the considered domain. Until now, this problem has been solved in the space of functions analytic in an open bounded domain with the topology of compact convergence.     

Compact Lorentzian holonomy

We consider (compact or noncompact) Lorentzian manifolds whose holonomy group has compact closure. This property is equivalent to admitting a parallel timelike vector field. We give some applications and derive some properties of the space of all such metrics on a given manifold.     

A weakly mixing dynamical system with the whole space being a transitive extremal distributionally scrambled set

It is known that the whole space can be a Li–Yorke scrambled set in a compact dynamical system, but this does not hold for distributional chaos. In this paper we construct a noncompact weekly mixing dynamical system, and prove that the whole space is a transitive extremal distributionally scrambled set in this system.