{{Primary sources|date=November 2013}} In category theory, a branch of mathematics, a '''spherical category''' is a pivotal category (a monoidal category with traces) in which left and right traces coincide.<ref>{{cite journal|journal=Advances in Mathematics|volume=143|issue=2|pages=357–375|year=1999|title=Spherical Categories|author=John W. Barrett |author2=Bruce W. Westbury |doi=10.1006/aima.1998.1800|doi-access=free|arxiv=hep-th/9310164}}</ref> Spherical fusion categories give rise to a family of three-dimensional topological state sum models (a particular formulation of a topological quantum field theory<ref>{{Cite book |last=Turaev |first=Vladimir Georgievič |title=Monoidal categories and topological field theory |last2=Virelizier |first2=Alexis |date=2017 |publisher=Birkhäuser Springer international publishing |isbn=978-3-319-49833-1 |series=Progress in mathematics |location=Cham}}</ref>), the '''Turaev-Viro model''', or rather '''Turaev-Viro-Barrett-Westbury model'''.<ref>{{cite web|title=Turaev-Viro model|url=https://ncatlab.org/nlab/show/Turaev-Viro+model|website=nLab|access-date=7 August 2017}}</ref>
==References== {{Reflist}}
Category:Category theory
{{categorytheory-stub}}