The definitive guide to mathematical problem solving, from one of the great teachers of the twentieth century George Pólya's perennial bestseller has inspired generations around the world to think more clearly. Brilliantly showing how 'there is a grain of discovery in the solution of any problem', his strategies for mathematical problem-solving - from finding weak points to squeezing the data - will help get to the bottom of any puzzle. 'A superb book on how to think fresh thoughts ...