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André Henriques's user avatar
André Henriques's user avatar
André Henriques
  • Member for 13 years, 11 months
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310 Answers

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201 votes

Can Cantor set be the zero set of a continuous function?

72 votes

Negative impact of wrong or non-rigorous proofs

54 votes
Accepted

How are the classifying space of $E_8$ and $K(\mathbb{Z},4)$ related?

53 votes

What could be some potentially useful mathematical databases?

47 votes
Accepted

What are the "correct" conventions for defining Clifford algebras?

46 votes
Accepted

Is a finite CW complex minus a point still homotopy equivalent to a finite CW complex?

43 votes

How does a mathematician choose on which problem to work?

36 votes

Why hasn't anyone proved that the two standard approaches to quantizing Chern-Simons theory are equivalent?

35 votes

‘Naturally occurring’ $K(\pi, n)$ spaces, for $n \geq 2$

33 votes

Examples of unexpected mathematical images

32 votes

(Very) High dimensional manifolds

32 votes
Accepted

What is π_1(BG) for an arbitrary topological group $G$?

32 votes

An example of a beautiful proof that would be accessible at the high school level?

31 votes

Demonstrating that rigour is important

31 votes

What is the most useful non-existing object of your field?

30 votes

Phenomena of gerbes

29 votes

The quotient stack $[\mathbb{A}^n / \mathrm{GL}_n]$

29 votes

Compelling evidence that two basepoints are better than one

29 votes
Accepted

Can we make distances in a finite subset of a manifold whatever we want?

28 votes
Accepted

Why is the double cover of $Sl(2,\mathbb{R})$ not algebraic?

27 votes
Accepted

Is there a 'nice' interpretation of virtual representations?

27 votes

What are Jacob Lurie's key insights?

26 votes

stacks as Morita equivalence classes

26 votes

What's a groupoid? What's a good example of a groupoid?

25 votes

Are measurable automorphism of a locally compact group topological automorphisms?

23 votes

What would you want on a Lie theory cheat poster?

23 votes

A non-formal space with vanishing Massey products?

23 votes

Distinguish smooth affine algebraic group by its underlying variety

22 votes
Accepted

Atiyah-Singer style index theorem for elliptic cohomology?

22 votes
Accepted

What do loop groups and von Neumann algebras have to do with elliptic cohomology?

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