The Garden of the Sphinx: 150 Challenging and Instructive Puzzles

These mathematical puzzles have appeared in the newspaper Le Monde during the past few years. A number of readers have responded to the challenge by offering not only original solutions and modes of attack but also by stating new problems related to those proposed. A dialogue was thus initiated in which my problems or those I reproduced from the literature generated a new set by stimulating the minds of my corre- spondents. This book presents a collection resulting from the fruitful exchange.