摘要
通过大量图例,以β环为中心,系统地讨论了基于超图的β环与纯环、β环与弱环、弱β环与γ环、β环与γ环的关系,以及基于线图的无β环与无α环、无β环与无α环之间的关系。
Based on a lot of graph example,with the β cyclic as center,this article discusses systematicallg the relation between -βcycle and pure-cycle, β-cycle and week -cycle, week -cycle and -cy cle, -cycle and -cycle based on hypergraph, and the relation Betw een -acyclic and -acyclic, β-acyclic and -acyclic based on line graph.
出处
《燕山大学学报》
CAS
2001年第1期69-72,共4页
Journal of Yanshan University
关键词
数据库模式
超图
线图
β环
database scheme,hypergraph,line graph,acyclicity.