Well, I don't know, but the book is by Mazzola et al and one of the als is named Stefan Muller who, according to Amazon.ca has a paper published in The arithmetic and geometry of algebraic cycles: Proceedings of the CRM summer school, June 7-19, 1998, Banff, Alberta, Canada (CRM is the Centre de Recherche Mathematiques.) He has other publications that seem similarly mathematical, although there would seem to be a fringe aspect to some of them. One of his books, published this year, is called Complex Predicates. The other authors do not have other publicatons listed on Amazon. On Fri, 6 Dec 2002, Prof. Peter Johnstone wrote:
While looking for something else, I came across a reference to a recent book called "The Topos of Music: Geometric Logic of Concepts, Theory and Performance" by G. Mazzola, published by Birkh"auser. Has anyone on the categories list seen this book? If so, can you say whether it is really about toposes and geometric logic as I (and most category-theorists) would understand those terms, or is it just a coincidence of terminology?
Peter Johnstone