A perennial bestseller by eminent mathematician G. Polya, How to Solve
It will show anyone in any field how to think straight. In lucid and
appealing prose, Polya reveals how the mathematical method of
demonstrating a proof or finding an unknown can be of help in attacking
any problem that can be "reasoned" out--from building a bridge to
winning a game of anagrams. Generations of readers have relished Polya's
deft--indeed, brilliant--instructions on stripping away irrelevancies
and going straight to the heart of the problem.