## August 24, 2005

### CFT, Gerbes and K-Theory in Oberwolfach, VII

#### Posted by Urs Schreiber

You’ll have noticed that I failed to report on the talks of the last two days in Oberwolfach, either because I was too tired, or too occupied or both. Here are some symposium-postprocessing notes.

**Update:** Peter Woit has followed the Oberwolfach discussion here and has written a related entry.

While searching for literature on what I now know is called ‘differential’ or ‘smooth’ K-theory I came across the report of another recent Oberwolfach workshop which is very closely related to the things I mentioned here recently:

P. Teichner & St. Stolz (Eds.)
**Geometric Topology and Connections with Quantum Field Theory**

OW Report No. 27/2005

This report is valuable for the references it assembles.

In the above fashion, every participant of an Oberwolfach workshop is supposed to provide a summary of his talk for the OW-Reports. A draft for my summary is the one below:

## August 22, 2005

### Lecture Notes on Higher Gauge Theory

#### Posted by Urs Schreiber

John Baez is giving a lecture on **Higher Gauge Theory, Homotopy Theory and $n$-Categories** in Calgary. The lecture notes are available online.

## August 20, 2005

### CFT, Gerbes and K-Theory in Oberwolfach, VI

#### Posted by Urs Schreiber

With kind permission, here are more details on Brano Jurčo’s talk:

Branislav Jurčo
**On the Classification of Nonabelian Bundle Gerbes with Connections**

(in preparation)

**Update 5th October 2005**: The corresponding preprint has now appeared as math.DG/0510078.

## August 17, 2005

### CFT, Gerbes and K-Theory in Oberwolfach, V

#### Posted by Urs Schreiber

Wednesday in Oberwolfach. The obstructions for the sun to shine finally lifted and we had something that even people from Australia would recognize as a summer day.

The workshop now has a webpage on which links to slides and other background information will eventually appear:

Workshop Gerbes, twisted K-theory and conformal field theory

## August 16, 2005

### CFT, Gerbes and K-Theory in Oberwolfach, IV

#### Posted by Urs Schreiber

## August 15, 2005

### CFT, Gerbes and K-Theory in Oberwolfach, III

#### Posted by Urs Schreiber

This evening in Oberwolfach: Talks on open strings in WZW models and lots of private discussion.

### CFT, Gerbes and K-Theory in Oberwolfach, II

#### Posted by Urs Schreiber

Oberwolfach is the mixture of a Zen monastery with a mathematical bioreactor. Nice experience.

## August 12, 2005

### K-theory for dummies, I

#### Posted by Urs Schreiber

I feel like talking about K-theory, K-homology, and the like. Here I start leisurely with a bird’s eye overview of some central ideas.

### CFT, Gerbes and K-Theory in Oberwolfach, I

#### Posted by Urs Schreiber

Next week I’ll be attending a mini-workshop at the MFO in Oberwolfach titled

**Gerbes, Twisted K-Theory and Conformal Field Theory**,

organized by Branislav Jurčo, Jouko Mickelsson and Christoph Schweigert.

If possible, I’ll try to report on this and that here at the Coffee Table.