Four colours suffice
Four colours suffice: how the map problem was solved Robin J. Wilson,
Publisher: London : Penguin, 2003.
ISBN: 014100908X
DDC: 526
Summary:
Can every map be coloured with no more than four colours so that
neighbouring countries are coloured differently? First posed in 1852,
it took more than 100 years for this question to be answered with any
degree of certainty. This book tells the story of the quest.
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