文件名称：平面图的理论与四色问题(Ⅳ)――三着色与四色问题的几何表征 (1985年)
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更新时间：2024-06-12 22:32:13
自然科学 论文
This is the fourth part of the series of five papers about planar graph theory and the four color problem. It contains the following five sections: 16 Three color problems;17 The Tait coloring of edges;18 The four color problem and chain groups;19 Proje-c