The Mathematical Work of John Wallis, D.D., F.R.S., (1616-1703) - Joseph Frederick Scott - Google Books

http://books.google.de/books?id=XX9PKytw8g8C

Wallis was one of the most original mathematicians of the seventeenth century and he left his mark on mathematics in many ways. He introduced arithmetical limits into mathematics (his famous infinite-product expression for $\pi$ is an example). His…