Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing the

This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the publi

Fifty years ago when Jacques Hadamard set out to explore how mathematicians invent new ideas, he considered the creative experiences of some of the greatest thi