Theo Johnson-Freyd

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Name	Theo Johnson-Freyd
Member for	3 years
Seen	18 hours ago
Website	math.berkeley.edu/~theojf
Location	Berkeley
Age	27

Graduate student at UC Berkeley, studying quantum field theory.

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Is “semisimple” a dense condition among Lie algebras?

dec 25 09 at 1:08 Theo Johnson-Freyd 22.3k●2●28●111

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What algebraic group does Tannaka-Krein reconstruct when fed the category of modules of a non-algebraic Lie algebra?

ct.category-theory gr.group-theory lie-algebras algebraic-groups tannakian-category

mar 8 at 16:55 Daniel Miller 2,311●8●23

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What does “quantization is not a functor” really mean?

qa.quantum-algebra ct.category-theory

feb 27 10 at 16:41 David Jordan 4,080●7●23

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What is the classifying space of “G-bundles with connections”

ct.category-theory lie-groups smooth-manifolds at.algebraic-topology

feb 18 10 at 2:04 Konrad Waldorf 1,905●1●13●15

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Is there a “quantum” Riemann zeta function?

divergent-series qa.quantum-algebra zeta-functions

nov 23 10 at 21:16 F. C. 412●3●6

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What is the symbol of a differential operator?

dg.differential-geometry lie-groups ap.analysis-of-pdes lie-algebras mp.mathematical-physics

mar 5 10 at 16:25 Steve Huntsman 8,149●1●22●56

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What does the generating function $x/(1 - e^{-x})$ count?

co.combinatorics lie-algebras hopf-algebras

mar 9 10 at 9:06 Bruce Westbury 6,645●2●10●25

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Examples of applications of the Borel-Weil-Bott theorem?

rt.representation-theory mp.mathematical-physics quantum-field-theory lie-groups

jan 9 10 at 23:17 Ben Webster♦ 20.7k●1●44●114

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What’s the current state of the classification of not-fully-extended TQFTs?

tqft ct.category-theory at.algebraic-topology higher-category-theory homotopy-theory

jul 18 10 at 16:30 Jacob Lurie 6,259●24●36

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What does the Tannakian formalism reconstruct when fed the category of chain complexes?

tannakian-category supersymmetry rt.representation-theory ct.category-theory algebraic-groups

apr 3 12 at 2:55 Ben Wieland 3,127●4●21

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What is to Quantize something?

Why worry about the axiom of choice?

“Philosophical” meaning of the Yoneda Lemma

How to respond to “I was never much good at maths at school.”

Quantum dynamics on varieties and Salmon Prizes

Topological Characterisation of the real line.

Why linear algebra is fun!(or ?)

Is there a reason why integrals are so much easier to evaluate than sums?

A single paper everyone should read?

In knot theory: Benefits of working in $S^3$ instead of $\mathbb{R}^3$?

Mathematical foundations of Quantum Field Theory

Examples of great mathematical writing

Is there an explicit construction of a free coalgebra?

Sieve of Eratosthenes - eventual independence from initial values

BRST cohomology

A problem of an infinite number of balls and an urn

Combinatorial equation

What’s up with Wick’s theorem?

“Modern” proof for the Baker-Campbell-Hausdorff formula

Examples of seemingly elementary problems that are hard to solve?

Is there a Faa di Bruno-like formula for composition of three functions?

Favorite popular math book

When and why did the postdoctoral position originate?

Quantization and noncommutative deformations

quantum groups… not via presentations

Can distinct open knots correspond to the same closed knot?

Writing papers in pre-LaTeX era?

Character table does not determine group Vs Tannaka duality

When does a subgroup H of a group G have a complement in G?

Are there any good websites for hosting discussions of mathematical papers?

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Theo Johnson-Freyd

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Questions

Is “semisimple” a dense condition among Lie algebras?

What algebraic group does Tannaka-Krein reconstruct when fed the category of modules of a non-algebraic Lie algebra?

What does “quantization is not a functor” really mean?

What is the classifying space of “G-bundles with connections”

Is there a “quantum” Riemann zeta function?

What is the symbol of a differential operator?

What does the generating function $x/(1 - e^{-x})$ count?

Examples of applications of the Borel-Weil-Bott theorem?

What’s the current state of the classification of not-fully-extended TQFTs?

What does the Tannakian formalism reconstruct when fed the category of chain complexes?

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