中文摘要：

证明了对于任意的图G，其变换图G^＋--是极大边连通的当且仅当G至少有两条边且不同构于2K2．

英文摘要：

This paper proved that for any graph G, its transformation graph G^＋-- is maximally edge-connected if and only if G has at least two edges and G≠2K2 .