研究K7在环面上不同的嵌入的个数.证明了,K7在环面上有且仅有2X51个不同的嵌入,并且k7在环面上每一个嵌入的几何对偶图都是二部图.从而证明了,肠在环面上每一个嵌入都是可Grunbaum染色的.
In this paper, we showed that there are exactly 2 × 5! embeddings of K7 in the torus. All of such embeddings are triangular permitting Grunbaum coloring.