Theo Johnson-Freyd

18,513 reputation

334138

bio	website	math.berkeley.edu/~theojf
	location	Berkeley
	age	28
visits	member for	4 years, 6 months
	seen	1 hour ago
stats	profile views	13,321

I am a recent graduate from UC Berkeley. Starting Fall 2013, I am a Boas Assistant Professor at Northwestern University. My research is broadly centered on quantum field theory — my interests include category theory, representation theory, homological algebra, algebraic topology, Poisson geometry, and theoretical physics.

	18,513 reputation	bio	website	math.berkeley.edu/~theojf	visits	member for	4 years, 6 months
334138 badges		location	Berkeley		seen	1 hour ago

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228 Answers

votes activity newest

72	What is Quantization ?
64	Why worry about the axiom of choice?
54	“Philosophical” meaning of the Yoneda Lemma
42	How to respond to “I was never much good at maths at school.”
36	Quantum dynamics on varieties and Salmon Prizes

18,513 Reputation

+10	“Philosophical” meaning of the Yoneda Lemma
+5	What extra conditions are necessary for the following version of Koszul duality?
+10	Is there a categorification of the integers in terms of “graded sets”?
+5	What's an example of a locally presentable category “in nature” that's not $\aleph_0$-locally presentable?

164 Questions

votes activity newest

39	Is “semisimple” a dense condition among Lie algebras?
33	What algebraic group does Tannaka-Krein reconstruct when fed the category of modules of a non-algebraic Lie algebra?
32	Is there an accepted definition of $(\infty,\infty)$ category?
32	What does “quantization is not a functor” really mean?
27	What is the symbol of a differential operator?

225 Tags

185 ct.category-theory × 97	90 lo.logic × 6
168 mp.mathematical-physics × 28	88 lie-algebras × 34
154 qa.quantum-algebra × 31	77 intuition × 5
131 at.algebraic-topology × 31	76 set-theory × 9
107 soft-question × 32	65 gn.general-topology × 12