"Smullyan is not your run-of-the-mill puzzlemeister; he polishes up old chestnuts, spins variations on a theme, and peoples his logical world with a delightful cast of characters."
-- Science 82
"Another scintillating collection of brilliant problems and paradoxes by the most entertaining logician and set theorist who ever lived. As in all of Professor Smullyan's fantastic puzzle books, you end up exploring that strange subterranean region below mathematics, where Godelian corridors lead in all directions to beautiful theorems about truth and provability."
-- Martin Gardner
"I believe Ray Smullyan to be the Lewis Carroll of our times. His little books of logic puzzles will be remembered long after most of us are forgotten. Here, he has tackled difficult material, suitable to the modern computing age, and presented it with good humor and a tingling sense of discovery."
-- Peter Denning, Professor of Computer Sciences, Purdue University
"You may experience small frissons of delight as you follow Smullyan into the dizzying heights of Godel's proof and the very nature of proof, truth, and logic in mathematics."
-- Kirkus Reviews
About the Author
Raymond Smullyan is considered one of America's most inventive creators of logic puzzles. His many writings include a previous volume of recreational logic and math problems, What Is the Name of This Book?; two studies of deductive logic in chess, The Chess Mysteries of Sherlock Holmes and The Chess Mysteries of the Arabian Nights; two collections of philosophical essays and aphorisms; The Tao Is Silent and This Book Needs No Title, and most recently, Satan, Cantor, and Infinity. He is a professor of mathematical logic at Indiana University. | 
