四色猜想的提出来自英国。1852年,毕业于伦敦大学的弗南西斯·格思里来到一家科研单位搞地图着色工作时,发现了一个有趣的现象:“每幅地图都可以用四种颜色着色,使得有共同边界的国家着上不同的颜色。”这个结论能不能从数学上加以严格证明呢?他和在大学读书的弟弟格里斯决心试一试。兄弟二人为证明这一问题而使用的稿纸已经堆了一大叠,可是研究工作没有进展。1852年10月23日,他的弟弟就这个问 Four-color conjecture came from the United Kingdom. When Vincent Guthrie, a graduate of the University of London, came to a research institute in 1852 to paint a map, he found an interesting phenomenon: “Each map can be colored in four colors so that there is a common border Of countries in different colors. ”This conclusion can not be mathematically rigorous proof? He and his brother Giles studying in college determined to give it a try. The manuscripts used by brothers and sisters to prove the problem have stacked a large pile, but research has not progressed. October 23, 1852, his brother asked about this