10.3969/j.issn.1672-7495.2001.01.017
四色猜想
@@ We may easily check (检验) that this map of fifteen countries can be colored in two colors such that countries sharing an edge(有公共边界) have different colors. But that cannot be done with this map. Why?
公共边界
O64
2006-10-09(万方平台首次上网日期,不代表论文的发表时间)
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