18

Answers
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16
Non-commutator in simple group?
13
How many elements does it take to normally generate a group?
10
Connections between ultrafilters in topology and logic
7
Do you know how to construct a compact hyperbolic 3-manifold with three or four totally geodesic boundary components?
6
Example of a manifold which is not a homogeneous space of any Lie group
6
A name for a weak topology
5
When does a homomorphism factor through a free group?
5
Isometries between metric spaces
5
The number of cusps of higher-dimensional hyperbolic manifolds
5
Is the cut locus of a generic point in a hyperbolic manifold a generic polyhedron?
5
Is there a combinatorial analogue of Ricci flow?
4
When does Cantor-Bernstein hold?
4
center of fundamental group of finite volume-hyperbolic orbifold
3
Can anyone give me a good example of two interestingly different ordinary cohomology theories?
3
fundamental groups of surfaces
3
Is there a quaternionic algebraic geometry ?
1
Is there a “knot theory” for graphs?
1
Can the fundamental group of an intersection of a homeomorphic image of a ball with a complement of a ball in $R^3$ be perfect?