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George Polya's 1945 book How to Solve It is a small volume describing methods of problem-solving. It suggests the following steps when solving a mathematical problem:

First, you have to understand the problem.
After understanding, then make a plan.
Carry out the plan.
Look back on your work. How could it be better?

His book contains a dictionary-style set of strategies, but is not a cook-book. See also heuristic.

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