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| Keywords: DeMorganFourColour.png Extract from De Morgan's original letter to Hamilton about the four colour conjecture October 23 1852 Trinity College Dublin 1852年10 23日德摩根写给哈密尔顿的 信 信中首次提到四色 想并做了 步探讨 信件原件如今 存 都柏林三 学院 PD-old-100 Four-color theorem 1852 in science Augustus De Morgan Manuscripts William Rowan Hamilton | ||||
