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Which 2-Segal spaces induce Multi-fusion categories?

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Speaker: 
Jonte Gödicke
Affiliation: 
MPIM
Date: 
Tue, 13/01/2026 - 11:00 - 12:30
Location: 
MPIM Seminar Room
In the theory of 3-dimensional Topological Field Theories (short TFTs), certain monoidal categories called multi-fusion categories are of fundamental importance. Well-known simple examples of these arise from finite groups via a linearization construction. However,  from the same construction also more interesting examples of monoidal categories can be constructed from any 2-Segal space. These include so-called Hall monoidal categories, which are anticipated to have interesting connections to certain TFTs.

In this talk, I will discuss the question, which 2-Segal spaces induce multi-fusion categories. For this, I will introduce a 2-categorical characterization of multi-fusion categories to translate questions about these monoidal structures to questions about homotopy coherent algebra in ($\infty,2$)-categories of spans. 

 

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