File:DeMorganFourColour.png
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Original file (1,107 × 1,193 pixels, file size: 264 KB, MIME type: image/png)
Summary
Extract from De Morgan's original letter to Hamilton about the four colour conjecture, October 23 1852. Trinity College, Dublin.
1852年10月23日德摩根写给哈密尔顿的通信。信中首次提到四色猜想并做了初步探讨。信件原件如今保存在都柏林三一学院。
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:08, 19 June 2012 |  | 1,107 × 1,193 (264 KB) | wikimediacommons>Snorri95 | Extract from De Morgan's original letter to Hamilton about the four colour conjecture, October 23 1852. Trinity College, Dublin. |
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