图G是3-边连通的且G的奇度点的数目为k.若k小于等于4,则G是上可嵌入的;若k大于等于6,则ξ(G)小于等于k/2减去1.而且当k不小于6时,存在无限多个3边连通图G使得ξ(G)等于k/2减去1.
For a 3-edge connected graph G, the number of vertices with odd degree in G is k. If k less than or egual to 4, then G is up-embeddable; if k not less than 6, then ξ(G) is less than or equal to k/2 minus 1. Furthermore, when k not less than 6, there are infinite number of 3-edge connected sim- ple graphs with ξ(G) equal to k/2 minus 1.