Roberto Frigerio's user avatar
Roberto Frigerio's user avatar
Roberto Frigerio's user avatar
Roberto Frigerio
  • Member for 13 years, 9 months
  • Last seen more than 1 year ago
21 votes
Accepted

How many elements does it take to normally generate a group?

18 votes
Accepted

Non-commutator in simple group?

14 votes
Accepted

Which knots are singularities of a hyperbolic cone-manifold structures on $S^3$?

13 votes

Connections between ultrafilters in topology and logic

10 votes

Do you know how to construct a compact hyperbolic 3-manifold with three or four totally geodesic boundary components?

10 votes

When does Cantor-Bernstein hold?

9 votes

Example of a manifold which is not a homogeneous space of any Lie group

9 votes

The number of cusps of higher-dimensional hyperbolic manifolds

9 votes
Accepted

Isometries between metric spaces

9 votes

Can anyone give me a good example of two interestingly different ordinary cohomology theories?

9 votes

Is there a finitely additive measure on R which is not sigma-additive?

8 votes

Is there a combinatorial analogue of Ricci flow?

7 votes
Accepted

Is the cut locus of a generic point in a hyperbolic manifold a generic polyhedron?

6 votes

A name for a weak topology

6 votes

center of fundamental group of finite volume-hyperbolic orbifold

5 votes

Uniquely geodesic and CAT(0) spaces?

5 votes

When does a homomorphism factor through a free group?

5 votes

Is there a quaternionic algebraic geometry ?

4 votes
Accepted

Does Dehn filling always decrease Gromov norm?

3 votes

Is there a "knot theory" for graphs?

3 votes

fundamental groups of surfaces

1 vote

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?