Efthimiou (U. of Central Florida) presents material from a lecture series he delivered as part of training a math team. Students with backgrounds ranging from function theory to differentiability should be able to follow the book, particularly high school students who participate in math competitions and are interested in the International Math Olympiads. Most of the questions he deals with, he warns, require ingenuity and insight rather than knowing a lot of techniques. After setting out the background, he covers basic equations, generalization, changing the rules, equations with no parameters, and getting additional experience. Annotation ©2011 Book News, Inc., Portland, OR (booknews.com)