Four Colors Suffice: How the Map Problem Was Solved

Four Colors Suffice: How the Map Problem Was Solved -

On October 23, 1852, Professor Augustus De Morgan wrote a letter to a colleague, unaware that he was launching one of the most famous mathematical conundrums in history--one that would confound thousands of puzzlers for more than a century. This is the amazing story of how the "map problem" was solved. The problem posed in the letter came from a ...

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