 | Four Colours Suffice: How the Map Problem Was Solved by Robin J. Wilson
Buy used from: £4.15 A good overview of various attempts to determine the least number of colours required to colour a map. Four colors will suffice. Suitable for anybody with some basic mathematics skills.
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 | Prime Obsession: Bernhard Riemann and the Greatest Unsolved Problem in Mathematics by John Derbyshire
Buy new: £7.72 / Used from: £5.24 A fantastic book. Suitable for the amateur number theorist, or someone who likes prime numbers. Most of the mathematics used is explained and well presented.
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