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Top Questions
43
votes
Are the rationals homeomorphic to any power of the rationals?
gn.general-topology
asked May 26 '10 at 12:22
mathoverflow.net
28
votes
Which spaces are inverse limits of discrete spaces ?
gn.general-topology
asked Feb 16 '10 at 10:34
mathoverflow.net
28
votes
Collatz conjecture for numbers of th form $2^n +1$
co.combinatorics
asked Jan 4 '11 at 14:39
mathoverflow.net
23
votes
Accumulation points of uncountable sets
real-analysis
general-topology
asked Feb 21 '13 at 12:07
math.stackexchange.com
21
votes
Tetrahedra with prescribed face angles
mg.metric-geometry
hyperbolic-geometry
3-manifolds
euclidean-geometry
spherical-geometry
asked Feb 24 '10 at 7:54
mathoverflow.net
20
votes
A game played on a rectangle
game-theory
asked Nov 22 '12 at 15:07
math.stackexchange.com
20
votes
When is a extension of $\mathbb{Z}$ by a free group a CAT(0) group?
gr.group-theory
gt.geometric-topology
geometric-group-theory
alexandrov-geometry
asked Feb 1 '11 at 11:11
mathoverflow.net
17
votes
Is a inverse limit of compact spaces again compact ?
gn.general-topology
asked Mar 18 '10 at 13:35
mathoverflow.net
16
votes
Outer automorphisms of finite extensions
gr.group-theory
asked Apr 15 '11 at 12:48
mathoverflow.net
15
votes
Automorphisms of $SL_n(\mathbb{Z})$
gr.group-theory
asked Mar 3 '11 at 10:11
mathoverflow.net
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Top Answers
19
Proving that a group is free
mathoverflow.net
19
Example of an unnatural isomorphism
mathoverflow.net
16
The free group $F_2$ has index 12 in SL(2,$\mathbb{Z}$)
mathoverflow.net
13
Examples of common false beliefs in mathematics
mathoverflow.net
12
Homeomorphism-fixing subsets
mathoverflow.net
10
Are there space filling curves for the Hilbert cube ?
mathoverflow.net
8
homotopy associative $H$-space and $coH$-space
mathoverflow.net
8
What is an explicit example of a sequence converging to two different points?
mathoverflow.net
7
The fundamental group of an $S^1$-quotient
mathoverflow.net
7
Question about spectral sequences associated to filtered complexes with unbounded filtrations
mathoverflow.net
7
Visualizing hyperbolic metric of punctured sphere
mathoverflow.net
6
Applications of homotopy groups of spheres
mathoverflow.net
6
Question about exotic spheres
mathoverflow.net
6
When is a extension of $\mathbb{Z}$ by a free group a CAT(0) group?
mathoverflow.net
6
An example of a regular but not linear-based topological space
mathoverflow.net
6
Massey Products on a specific space
mathoverflow.net
5
Topological description of Manifold with boundary
mathoverflow.net
5
Examples of non-metrizable spaces
mathoverflow.net
5
Obstructions to $E_2$-algebra structure on $E_1$-algebra
mathoverflow.net
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mathoverflow.net
math.stackexchange.com