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SUMMARY:Theo Johnson-Freyd (Perimeter)
DTSTART:20210301T190000Z
DTEND:20210301T200000Z
DTSTAMP:20260423T004641Z
UID:UMassRep/25
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/UMassRep/25/
 ">Strongly-fusion 2-categories are grouplike</a>\nby Theo Johnson-Freyd (P
 erimeter) as part of UMass Amherst Representation theory seminar\n\n\nAbst
 ract\nA *fusion category* is a finite semisimple monoidal category in whic
 h the unit object is indecomposable\, equivalently has trivial endomorphis
 m algebra. There are two natural categorifications of this notion: a *fusi
 on 2-category* is a finite semisimple monoidal 2-category in which the uni
 t object is indecomposable\, and a *strongly fusion 2-category* is one in 
 which the unit object has trivial endomorphism algebra. As I will explain 
 in this talk\, fusion 2-categories are extremely rich\, with a seemingly-w
 ild classification\, whereas strongly-fusion 2-category are very simple: t
 hey are essentially just finite groups. Based on joint work with Matthew Y
 u.\n
LOCATION:https://researchseminars.org/talk/UMassRep/25/
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