Liu created joint trees, initiated in his early paper in 1979, ofagraph in 2003 which provided a foundation on studying embedding genus distribution.
2003年刘提出的图的联树(1979的文章体现了这种思想)为嵌入亏格分布的研究提供了理论基础。
2
This is the problem of embedding genus distribution for agraph.
这就是图的嵌入亏格分布问题。
3
In this paper, We obtain the total genus polynomials for two new classes of 4-regular graphs by using the joint tree model of agraph embedding introduced by Yanpei Liu.