Project Gutenberg’s Four Lectures on Mathematics, by Jacques Hadamard This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at Title: Four Lectures on Mathematics Delivered at Columbia University in 1911 Author: Jacques Hadamard Release Date: August 24, 2009