This book is a fresh, insightful, and highly original presentation of mathematical physics that will appeal to a broad spectrum of readers. I have not seen anything like it before. It is a book that a physicist or engineer would be proud to have written, and the fact that it has been written by a mathematician only adds to the book”s authority. A definite winner. –Paul J. Nahin, author of Digital Dice I know of no other book quite like this, or even similar to it. After a couple of sentences of the introduction, I was hooked. The general theme–to show how physical reasoning can illuminate mathematical ideas and simplify proofs–is very attractive. This book will appeal to math enthusiasts at all levels, from high-school students on up. –Philip Holmes, coauthor of Celestial Encounters