自反Banach空间中锥拟凸映射多目标最优化问题锥有效解集的弱连通性

本文在自反Banach空间中引进了锥弱连续映射和点集的弱连通概念．在讨论锥弱连续和锥拟凸映射以及锥最小上界的几个性质的基础上,证明了当象集为锥凸集时定义在自反Ba- nach空间中的有界闭凸集上的锥弱连续和锥拟凸映射多目标最优化问题的锥有效解集是弱连通的．     

关于子基的局部连通性

在粗燥集理论研究中,覆盖方法的应用越来越受到重视,其中拓扑空间的子集关于子基的内部和闭包两个概念尤为重要.在最近由它们导入的关于子基的连通性基础上,给出了关于子基的局部连通性概念,并研究它的性质,得到一般拓扑学中局部连通性的一种推广.     

集值映射向量优化问题ε-超有效解集的连通性

本文在赋范向量空间中讨论集值映射向量优化问题的ε-超有效性，在锥-半连续和广义锥-次类凸的假设条件下，获得了ε-超有效点(解)集的连通性结果．     

变换图G++-的超力连通性

对于图G,一般有λ(G)≤δ(G).如果λ(G)=δ(G),称图G是较大边连通的.如果G的每一个最小边割只能分离G的一个孤立点.称图G是超边连通的.本文证明了几乎所有的有限图G,其变换图G -都是超边连通的.     

L-拓扑空间的LF α-p连通性的若干性质

利用p-远域给出α-p连通性的樊畿定理,并研究了拓扑生成的L-fts中的α-p连通性的性质。     

On Parseval super-frame wavelets

Suppose that η1,...,ηn are measurable functions in L2(R).We call the n-tuple (η1,…,ηn) a Parseval super frame wavelet of length n if {2k/2η1(2kt-)（@）...(@)2k/2ηn(2kt-l):k,l∈Z}is a Parseval frame for L2...     

n重线有向图的超连通性

本文证明了，在最小度至少为3的前提下超弧连通有向图的迭代线图是超点连通的．作为推论，我们得到了Kautz网络和de Bruijn网络的超点连通性和超弧连通性．     

拓扑分子格的极不连通性和S—闭性

利用完备余ｃｏ－Ｈｅｙｔｉｎｇ代数上的伪补运算，在拓扑分子格上引入极不连通性和Ｓ－闭性，得到了每个Ｓ－闭的正则拓扑分子格是极不连通的以及同胚的广义序同态保持极不连通性和Ｓ－闭性。     

Structure and Connectivity Analysis of Financial Complex System Based on G-Causality Network

The recent financial crisis highlights the inherent weaknesses of the financial market. To explore the mechanism that maintains the financial market as a system, we study the interactions of U.S. financial market from the network perspective. Applied with conditional Granger causality network analysis, network density, in-degree and out-degree rankings are important indicators to analyze the conditional causal relationships among financial agents, and further to assess the stability of U.S. financial systems. It is found that the topological structure of G-causality network in U.S. financial market changed in diferent stages over the last decade, especially during the recent global financial crisis. Network density of the G-causality model is much higher during the period of 2007–2009 crisis stage, and it reaches the peak value in 2008, the most turbulent time in the crisis. Ranked by in-degrees and out-degrees, insurance companies are listed in the top of 68 financial institutions during the crisis. They act as the hubs which are more easily influenced by other financial institutions and simultaneously influence others during the global financial disturbance.     

Some results on R 2-edge-connectivity of even regular graphs

Let G be a connected k(≥3)-regular graph with girth g. A set S of the edges in G is called an Rredge-cut if G-S is disconnected and comains neither an isolated vertex nor a one-degree vertex. The R2-edge-connectivity of G, denoted by λ^n(G), is the minimum cardinality over all R2-edge-cuts, which is an important measure for fault-tolerance of computer interconnection networks. In this paper, λ^n(G)=g(2k-2) for any 2k-regular connected graph G (≠K5) that is either edge-transitive or vertex-transitive and g≥5 is given.