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Answers
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42
How can there be topological 4-manifolds with no differentiable structure?
Mar 10 '11 at 12:54
41
Total spaces of $TS^2$ and $S^2 \times R^2$ not homeomorphic
Mar 27 '12 at 13:02
37
Homomorphism from $\hat{\mathbb{Z}}$ to $\mathbb{Z}$
May 24 '11 at 13:40
36
How misleading is it to regard $\frac{dy}{dx}$ as a fraction?
Aug 23 '11 at 13:48
30
How much mathematics has been formally verified?
May 31 at 12:37
27
Is there a classification of open subsets of euclidean space up to homeomorphism?
May 7 '11 at 16:12
26
The homotopy category is not complete nor cocomplete
May 20 at 16:48
26
Most memorable titles
Nov 4 '10 at 0:10
24
Why don't more mathematicians improve Wikipedia articles?
May 22 '13 at 11:19
23
Duals and Tensor products
Feb 22 '11 at 13:19
23
Does $\pi_1$ have a right adjoint?
Nov 8 '10 at 20:41
23
$S^n \to S^m \to B$ bundle: possible?
Nov 3 '10 at 8:26
22
Is it true that all real projective space $RP^n$ can not be smoothly embedded in $R^{n+1}$ for n >1
May 10 '12 at 19:23
21
Stable homotopy category and the moduli space of formal groups
Aug 19 '11 at 9:31
20
List of Classifying Spaces and Covers
Feb 23 '11 at 8:50
20
Example of a compact homogeneous metric space which is not a manifold
Feb 24 '11 at 15:28
19
Algebra and Cancer Research
Apr 14 '14 at 13:37
19
Proving that a function's image contains (1/n,…,1/n)
Jul 13 '11 at 11:11
18
H*(braid group, irrep of symmetric group) = ?
Jun 25 '13 at 9:28
18
Why not define triangulated categories using a mapping cone functor?
Mar 9 '11 at 2:30
17
Does module Hom commute with tensor product in the second variable?
Dec 17 '15 at 16:09
17
Can the fact that the square of an integer is a natural number be categorified?
May 23 '13 at 18:27
17
De Rham cohomology of formal groups
Jan 17 '11 at 22:34
17
Spectral sequences: opening the black box slowly with an example
Nov 6 '10 at 8:02
16
Uniqueness of Complex Orientation of Morava K-theory
Dec 6 '14 at 15:51
16
Mayer-Vietoris sequence for topological K-theory
Nov 26 '14 at 17:12
16
Proving that a space cannot be delooped.
Apr 12 '13 at 19:50
16
Wanted: a “Coq for the working mathematician”
Jan 28 '14 at 10:07
16
Level of detail on a Phd application
Oct 12 '11 at 11:05
16
How is the differential in complex cobordism defined?
Jun 7 '11 at 21:20
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