k-边连通图在网络研究和图论研究中有着极其重要的地位.图论中有关2-边连通图的命题很多,它们刻画了2-边连通的本质.本文给出17种关于2-边连通图的等价性命题,力图从不同角度深入理解、挖掘2-边连通图的本征,并从本文定义的2种新运算出发,提出了新的有关2-边连通图的命题,并给出这些命题相互间的等价性证明.
As known,k-edge connected graphs play an important role in the research of networks and graph theory.There are many propositions of 2-edge connected graphs nowadays,which depict the essences of 2-edge connected graphs.We present 17 equivalent propositions of 2-edge connected graphs and dig more properties of 2-edge connected graphs from different aspects of 2-edge connected graphs.Furthermore,two equivalent propositions of 2-edge connected graphs by two new operations are proposed,and then we provide the equivalent proofs between the propositions we have collected and discovered.