### Categories, Quanta and Concepts at the Perimeter Institute

#### Posted by John Baez

Many customers here at the $n$-Café believe — do I dare say *know?* — that category theory provides crucial clues about the foundations of quantum theory. This summer there will be a workshop at the Perimeter Institute devoted to pursuing these clues:

- Categories, Quanta, Concepts, June 1–5, 2009, Perimeter Institute, Waterloo, Canada. Organized by Andreas Döring, Bob Coecke and Lucien Hardy.

Here’s a description of the workshop:

In recent years, more and more mathematical methods and results from the field of category theory have been employed in the foundations of physics. These methods enable us to reconsider conceptual and structural issues in the foundations of quantum theory and possibly beyond, often providing surprising insights and new points of view. The workshop “Categories, Quanta, Concepts” (CQC) will bring together researchers from a variety of backgrounds, physicists, mathematicians, theoretical computer scientists and philosophers, all with a common interest in the foundations of physics. With talks in the morning and workgroups and in-depth sessions in the afternoon, the workshop will provide ample opportunity for interaction between the participants from this emerging community. The workshop also serves as an ideal platform for PhD students to get insight into the field and to discuss their own work.

The invited speakers are:

- Samson Abramsky, Wolfson College, Oxford University
- Harvey Brown, Faculty of Philosophy, Oxford University
- Howard Barnum, Los Alamos National Laboratory
- Richard Blute, Dept. Mathematics and Statistics, Ottawa University
- Keye Martin, U.S. Naval Research Laboratory
- Prakash Panangaden, School of Computer Science, McGill University
- Peter Selinger, Mathematics and Statistics, Dalhousie University
- Mike Stay, University of California at Riverside

Mike may talk about using categories as a Rosetta Stone to understand the links between physics, topology, logic and computation.

## Re: Categories, Quanta and Concepts at the Perimeter Institute

Hi John,

Do you know any specific resource

for Category Theory specific for the topology of 4 manifolds?