By Joachim Kock

ISBN-10: 0511078846

ISBN-13: 9780511078842

ISBN-10: 0521540313

ISBN-13: 9780521540315

ISBN-10: 0521832675

ISBN-13: 9780521832670

Describing a impressive connection among topology and algebra, instead of simply proving the concept, this examine demonstrates how the outcome matches right into a extra basic trend. in the course of the textual content emphasis is at the interaction among algebra and topology, with graphical interpretation of algebraic operations, and topological buildings defined algebraically when it comes to turbines and relatives. comprises quite a few workouts and examples.

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**Extra info for Frobenius algebras and 2D topological quantum field theories**

**Example text**

5. 3. 15. 4. Draw examples of cobordisms from the empty 1-manifold ∅1 to itself. Classify them all up to equivalence. 5. 19 is indeed a group. ) 6. 19) and the statement made there about CP2 to prove that there is no orientation-preserving diffeomorphism from CP2 2 to CP . In other words, there is no orientation-reversing diffeomorphism from CP2 to itself. ) 7. Consider a TQFT in dimension 2 with the following properties. The circle is sent to the vector space V of all n-by-n matrices over k. For simplicity 34 Cobordisms and TQFTs take n = 2, but this has nothing to do with the dimension of the TQFT.

We have already seen many examples of disconnected cobordisms. The example above illustrates the true importance of allowing disconnected objects (manifolds and cobordisms): namely that even if we start with a connected cobordism, when we chop it up we easily get disconnected ones! This is good, because if we have a disconnected cobordism we can study its connected components separately – and the more we can split up the problem into simpler parts the more easily we can understand it. In general, a disconnected manifold can always be written as the disjoint union of its connected components.

First, the universal U1 (with Rn in the place of X) implies there is a unique property of U = U0 continuous map U → Rn making the diagram commute. Second, the universal 38 Cobordisms and TQFTs property of Rn provides a continuous map in the other direction, and clearly they are inverses to each other, so f is indeed a homeomorphism. So we have constructed a coordinate chart with domain U . Now there were choices involved: for each choice of f0 and f1 , the construction gives a chart f on U . We claim that all these charts have C 0 transition, so they belong to the same maximal atlas.

### Frobenius algebras and 2D topological quantum field theories by Joachim Kock

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Categories: Algebraic Geometry