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Theo Johnson-Freyd

I am a postdoc in the Mathematical Physics group at the Perimeter Institute for Theoretical Physics. I focus on topological and conformal field theory, categories, homotopical algebra, and quantization of gauge systems, with side interests in Poisson and symplectic geometry, Lie and quantum groups, and low dimensional topology.

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Top Posts (495) All Questions Answers | Votes Newest

115 Why worry about the axiom of choice? Apr 29 '10
102 What is Quantization ? Nov 20 '09
101 “Philosophical” meaning of the Yoneda Lemma Oct 29 '09
61 How to respond to “I was never much good at maths at school.” Nov 20 '09
61 Is there an accepted definition of $(\infty,\infty)$ category? Jun 18 '13
58 What is the symbol of a differential operator? Oct 30 '09
52 Can every manifold be given an analytic structure? Dec 13 '09
51 Is “semisimple” a dense condition among Lie algebras? Dec 24 '09
40 What algebraic group does Tannaka-Krein reconstruct when fed the category of modules of a non-algebraic Lie algebra? Apr 15 '10
39 What does the generating function $x/(1 - e^{-x})$ count? Dec 18 '09
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