##### Department of Mathematics,

University of California San Diego

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### Math 295 - Mathematics Colloquium

## Sasha Voronov

#### University of Minnesota

## The n-category of cobordisms and TQFT

##### Abstract:

Since Atiyah and Segal described the notions of Topological Quantum Field Theory (TQFT) and Conformal Field Theory (CFT), mathematicians have been looking for a suitable n-category framework to describe cobordisms with corners and a more general TQFT involving such cobordisms as a functor from that higher category of cobordisms with corners to a higher category of vector spaces. The problem deals with such standard difficulties of higher category theory as weak vs. strict axioms, coherence, suitable diagrams, etc.: almost every higher category theorist has this problem in the back of her head, but nobody seems to have gotten through to a satisfactory solution. In the talk, I will describe the set up Mark Feshbach and I have found.

Host: Nitya Kitchloo

### January 10, 2008

### 10:00 AM

### AP&M 6402

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