Four colors suffice how the map problem was solved
Robin J. Wilson (Author)
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 book tells the amazing story of how the "map problem" was solved
eBook, English, 2014
Revised color edition.
Princeton University Press, Princeton, 2014