AN UPDATE ON THE FOUR-COLOR THEOREM
AN UPDATE ON THE FOUR-COLOR THEOREM
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四色定理的更新
DOI:
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发表时间:
1998
期刊:
影响因子:
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通讯作者:
R. Thomas
中科院分区:
文献类型:
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作者:
R. Thomas
848 NOTICES OF THE AMS VOLUME 45, NUMBER 7 E very planar map of connected countries can be colored using four colors in such a way that countries with a common boundary segment (not just a point) receive different colors. It is amazing that such a simply stated result resisted proof for one and a quarter centuries, and even today it is not yet fully understood. In this article I concentrate on recent developments: equivalent formulations, a new proof, and progress on some generalizations.