集值映射多目标规划问题的解集的连通性

本文研究了无限维空间里集值映射的多目标规划问题。主要结果是：当目标函数为类凸的集值映射时，其目标空间里的有效点集是连通的；若目标函数为Ｃ－凸的集值映射时，其有效解集也连通。     

Super Connectivity of Line Graphs and Digraphs

The h-super connectivity κh and the h-super edge-connectivity λh are more refined network reliability indices than the conneetivity and the edge-connectivity. This paper shows that for a connected balanced digraph D and its line digraph L, if D is optimally super edge-connected, then κ1（L） = 2λ1 （D）, and that for a connected graph G and its line graph L, if one of κ1 （L） and λ（G） exists, then κ1（L） = λ2（G）. This paper determines that κ1（B（d, n） is equal to 4d- 8 for n = 2 and d ≥ 4, and to 4d-4 for n ≥ 3 and d ≥ 3, and that κ1（K（d, n）） is equal to 4d- 4 for d 〉 2 and n ≥ 2 except K（2, 2）. It then follows that B（d,n） and K（d, n） are both super connected for any d ≥ 2 and n ≥ 1.     

LF拓扑空间中r连通性的讨论

研究了LF拓扑空间中r连通性的拓扑不变性质和樊畿定理型刻画,在提出了r序同态和r连通性的基础上讨论了二者的基本性质,证明了r连通性是r拓扑性质;得到了r连通性的樊畿定理;为讨论r连通性的其他性质奠定了基础.     

多目标最优化G-恰当有效解集的存在性和连通性

本文证明了非空紧凸集上拟凸多目标最优化问题的G-恰当有效解的存在性．在此基础上，得到了向量目标函数既是似凸又是拟凸的多目标最优化问题的G-恰当有效解集是连通的结论．同时，还给出一个关于Pareto有效解集连通性的新结果．     

关于3-连通图最长圈的注

设C是3-连通图G的一个最长圈,H是G-V(C)的一个分支满足|H|≥3.文献[4]在给H附加一些条件后,证明|C|≥2d(u) 2d(v)-5,并且不等式严格成立除非G属于某些例外图类,这里u,v是G中两个不相邻的顶点.本文给出了上述例外图类的精确刻划.     

Effect of Topological Connectivity on Firing Pattern Transitions in Coupled Neurons

By using the coupled model of Hindmarsh-Rose neuronal systems, we numerically investigate the effect of topology structures on the firing patterns transition （FPT）. A four-cell coupled system with all possible configurations are studied. We select the membrane current Iext as a controllable parameter, and set it to be near the left side for one of the bifurcation points. It is found that to have a response from some external stimuli with the proper amplitude and frequencies, the transition will appear between different firing states only when the cells in the system are coupled with some proper topological structures, which implies the occurrence of FPT induced by the configuration in the coupled system. Similar FPT phenomena could also be observed in a five-cell coupled system. Fbrthermore, we find that such transition behaviors may have some inherent relevance with the synchronization error and the average connective number among cells in the coupled system for different topology structures. These results suggest that the biological neuron systems may achieve an effective response to the external feeble stimulus by selecting the proper configuration and using the corresponding transition mode.     

交换环的素谱与极大谱的连通性

试图刻划交换环的素谱和极大谱的连通分支,为此本文讨论了交换环的本原幂等元与素谱以及极大谱的连通分支的关系.证明了若e为本原幂等元,则D(e)为SpecA的连通分支.类似地,若e为A的本原幂等元且Nil(A)=Rad(A),则D(e)为maxA的连通分支.     

超空间2^X的连通性及其相关性质

研究了赋予Vietoris拓扑的超空间2X的连通性及其相关性质.这改进了Micheal[1]的一个定理的结论.     

格的内蕴拓扑与完全分配律

本文以Ｓｃｏｔｔ拓扑，Ｚａｒｉｓｋｉ拓扑，区间拓朴等刻划了完全分配律；获得了格的特殊元的存在性与区间拓扑连通性等之间的众多制约关系，给出了若干应用实例和重要反例．     

线团图的性质

本文研究线团图的性质,得到了有关线团图的连通性、边连通性、边色数、Hamnton性、周长及围长的一些结果以及一些基本性质。