Applying the theory of the cut edge and connectivity concerning non directed graph in the graph theory,this paper deals with the concept of the principal cut edge and secondary connectivity,derives several related properties,and puts forward an effective method to seek systematically a Eulers path from the non directed praph the method of non principal cut edge.
运用图论中无向图的割边与连通性的理论 ,阐述无向图的主割边与次连通性的概念 ,推导出若干有关性质 ,并给出一种在无向图中寻求一条欧拉路的有效方法取非主割边法 。
The Subcontinuity, P-continuity and U-contiuity of the Multifunctions Spaces;
首先给出了集值映射的次连续定义，并研究了集值映射空间的次连续性；然后给出了集值映射的Ｐ─连续定义，研究了集值映射的Ｐ─连续性，最后给出了集值映射的Ｕ─连续定义并研究了集值映射的Ｕ─连续性。