Three mathematicians (U. of Wisconsin) offer general readers short adventures into the various specific disciplines of mathematics and explain the concepts in non-technical terms. The text of the 1969 first edition has not been revised, but annotated. The most important updates are at least partial solutions to Fermat's Last Theorem and the four-color problem, but the notes also explain what are now historical references, such as the Vietnam War. Annotation c. Book News, Inc., Portland, OR (booknews.com)