研究局部连通图中支撑树的变换.给出L.Nebesk定理的一个新证明,并将其推广得到一类新的上可嵌入图.
This paper studied the transformation of spanning trees in a locally connected graph and gave a new proof of Nebesk theorem for up-embeddability of a locally connected graph and generalized it to a new class of upper-embeddable graphs.