basics
Examples
The Levin-Wen model is a model (in theoretical physics) for certain phenomena in 2-dimensional solid state physics. It can be regarded as a 3d TQFT.
The 4d TQFT analog of the Levin-Wen model is the Walker-Wang model.
The original article is
A discussion of the Levin-Wen model as an extended 3d TQFT formulated using tensor categories is in
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