Theo Johnson-Freyd's user avatar
Theo Johnson-Freyd's user avatar
Theo Johnson-Freyd's user avatar
Theo Johnson-Freyd
  • Member for 14 years, 5 months
  • Last seen this week
10 votes

Why are so few operations with arity bigger than 2?

9 votes

How should one present calculations?

9 votes

Correlation and Causation. When can we believe correlation (reasonably, at least) imply causation

9 votes

Representation of Groupoids

9 votes

Taking lecture notes in lectures

9 votes
Accepted

Example of a finite group $G$ with low dimensional cohomology not generated by Stiefel-Whitney classes of flat vector bundles over $BG$

9 votes

Impact of LHC on math ?

9 votes

Is SU(2) a normal subgroup of SL(2,C)?

9 votes

Why chain homotopy when there is no topology in the background?

9 votes
Accepted

PBW theorem over a Q-algebra, without freeness or flatness

9 votes

Some questions on Nicolai Reshetikhin's lectures on quantization of gauge theories.

9 votes

Appearances of 'exotic' compact Lie Groups

9 votes
Accepted

What is the correct definition of semisimple linear category?

9 votes
Accepted

Stably-framed cobordism $(\infty,n)$-category

8 votes
Accepted

Functor category of quantum field theories?

8 votes
Accepted

Relation between positive roots of $E_8$ and $\mathbb{F}_2^8 \setminus \{0\}$

8 votes
Accepted

2-TQFT are to Frobenius Algebras as ??? are to Hopf Algebras

8 votes
Accepted

Is the metaplectic group not a matrix group - counterexample

8 votes

Yang-Mills and Chern-Simons functionals as Morse functions

8 votes

Sign convention for derivations in CDGAs

8 votes

What role does the "dual Coxeter number" play in Lie theory (and should it be called the "Kac number")?

8 votes

Sporadic subgroup of E7

8 votes
Accepted

Where is the exponential map a diffeomorphism?

8 votes

Which nice/deep elaborations on the (operators <-> sheaves) / (endomorphisms <-> objects) theme are there?

8 votes
Accepted

Establishing Duality in Tannakian Categories

8 votes

Cogroup objects

8 votes

What is the comultiplication of a matrix frobenius algebra?

8 votes

What is Chern-Simons theory?

8 votes

What do people mean by "subcategory"?

8 votes

Resources for graphical languages / Penrose notation / Feynman diagrams / birdtracks?

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