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Leonard M. Wapner The Pea and the Sun: A Mathematical Paradox. A. K. Peters, 218 pages, $34.
There is a big difference between what mathematicians call a fallacy and what they call a paradox. A fallacy is a flawed proof, such as the "proof" on page fifty-four of the book under review, that all triangles are isosceles. A paradox is an assertion almost impossible to believe but nevertheless true. A good example is the famous twin paradox of relativity. If one twin travels a long distance from the earth, at a fast speed, then returns, she'll be younger than her stay-at-home sister. The time difference can be arbitrarily large. If the traveling twin goes to a distant ...