This companion to Number and the Nature of Mathematics takes a look at simple number systems, such as the Integers, as did the original, but from the viewpoint of modern category theory. That theory has become ubiquitous in modern mathematical thinking. As such, this can serve as an introduction to simple aspects of Category Theory. There is a brief introduction of the application of category theory to computing.
Joseph Bergin has been teaching at Manchester since 1978, and is an internationally recognised expert on the history of early modern France, especially the seventeenth century. He has written six major books, one of which was awarded the Prix Richelieu in 1995, and edited a number of others. He was elected a Fellow of the British Academy in 1996 and has frequently been a visiting professor to French universities.