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
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3 votes
0 answers
102 views

In how many ways does a Lie algebra decompose as an orthogonal direct sum of Cartans?

18 votes
1 answer
656 views

$8 \times 31 = 8 \times 31$?

4 votes
0 answers
156 views

When is $q$ invertible mod $m$, mod its order mod $m$, mod its order mod its order mod $m$, ad infinitum?

4 votes
1 answer
227 views

How do "Kummer closures" of fields look?

22 votes
2 answers
603 views

Does the 3875-dimensional rep of $E_8$ have a solution to $x\star x=0$?

6 votes
1 answer
277 views

Which finite simple groups are rational-relative-real?

3 votes
1 answer
353 views

How often does algebraic-conjugacy imply conjugacy?

9 votes
2 answers
1k views

Critical points on a fiber bundle

10 votes
1 answer
300 views

Which spectra have a universal connective quotient?

3 votes
0 answers
127 views

Which spectra have a homotopy-universal connective quotient?

90 votes
4 answers
14k views

Can every manifold be given an analytic structure?

31 votes
9 answers
5k views

Why should I prefer bundles to (surjective) submersions?

7 votes
4 answers
628 views

Explicit bounds for the asymptotics of oscillatory integrals

39 votes
2 answers
2k views

Is there a "quantum" Riemann zeta function?

2 votes
1 answer
533 views

What kind of uniqueness can I conclude for solutions to a simple functional equation?

13 votes
2 answers
777 views

Which finite groups have low-degree essential cohomology?

7 votes
3 answers
802 views

Is there a "geometric" language that describes the equivalence groupoid of a foliated manifold?

16 votes
6 answers
2k views

What is an algebraic group over a noncommutative ring?

8 votes
0 answers
260 views

What can I say about an $E_\infty$ ring spectrum with an odd invertible element?

4 votes
0 answers
332 views

Is there a name for objects all of whose endomorphisms are automorphisms?

8 votes
3 answers
2k views

What characterizes rational functions with nonnegative integer Taylor coefficients?

5 votes
1 answer
1k views

Do Lie algebroids pull back (along submersions)?

87 votes
4 answers
7k views

Is there an accepted definition of $(\infty,\infty)$ category?

8 votes
1 answer
2k views

Normal coordinates for a manifold with volume form

19 votes
4 answers
1k views

What are the points of Spec(Vassiliev Invariants)?

8 votes
0 answers
123 views

What are the stable cohomology classes of the "orthogonal groups" of finite abelian groups?

8 votes
0 answers
230 views

Is there a finite group with nontrivial $H^2$ but vanishing $H^4$, $H^5$, and $H^6$?

21 votes
3 answers
3k views

How many flat connections has a line bundle in algebraic geometry?

5 votes
0 answers
130 views

Can a braided fusion category have an order-2 Morita equivalence class which cannot be simultaneously connected and isomorphic to its opposite?

5 votes
1 answer
376 views

Which groups have undetectable third U(1)-cohomology?

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