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How False is Kempe's Proof of the Four Color Theorem?

机译:Kempe的四色定理证明有多错误?

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摘要

We examine Lord Alfred Bray Kempe's "proof of the Four Color Theorem, from the original faulty publication through several graphs that served as counterexamples throughout the history of the problem. Following Hutchinson and Wagon in [HW98], we then view Kempe's method of proof (literally) as a recursive algorithm, and re-examine our collection of historically motiviated graphs to determine those that are indeed true counterexamples. In particular, Kempe's algorithm may sometimes correctly four color a planar graph and at other times may halt before completing a proper vertex coloring. Penultimately, we present two nine-vertex counterexamples and prove that Kempe's algorithm will never fail to properly vertex color a planar graph on fewer than nine vertices. Finally, we mention some open questions on this subject.
机译:我们从原始有问题的出版物到贯穿整个问题历史的几个图表,考察了阿尔弗雷德·布雷·肯佩勋爵的“四色定理证明”。在[HW98]中的Hutchinson和Wagon之后,我们接着查看了Kempe的证明方法(从字面上看)作为递归算法,并重新检查我们的历史动机图集合以确定确实是真实的反例(特别是,肯佩的算法有时可以正确地对平面图进行四种颜色着色,有时在完成适当的顶点之前可能会暂停)倒数第二,我们提出了两个九顶点反例,并证明Kempe的算法将永远不会对少于九个顶点的平面图正确地进行顶点着色,最后,我们提到了有关此主题的一些未解决的问题。

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