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Stefan Friedl
University of Cologne
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Top Questions
20
votes
Topological embeddings of real projective space in euclidean space
gn.general-topology
gt.geometric-topology
asked Jan 28, 2018 at 17:46
mathoverflow.net
19
votes
Are the Morse inequalities sharp for 5-manifolds
gt.geometric-topology
asked Oct 13, 2020 at 21:36
mathoverflow.net
19
votes
are there high-dimensional knots with non-trivial normal bundle?
at.algebraic-topology
gt.geometric-topology
asked Jan 24, 2021 at 11:39
mathoverflow.net
13
votes
applications of Sard's to differential topology
gt.geometric-topology
differential-topology
asked Aug 26, 2021 at 8:33
mathoverflow.net
13
votes
Finite index subgroups of free groups and torsion-free amenable quotients of free groups
gr.group-theory
asked Nov 10, 2011 at 7:41
mathoverflow.net
12
votes
Is a generic closed orientable hyperbolic 3-manifold Haken?
gt.geometric-topology
asked Aug 24, 2014 at 13:34
mathoverflow.net
11
votes
The homeomorphism problem for hyperbolic 3-manifolds and the virtual Haken theorem
gt.geometric-topology
3-manifolds
asked Oct 27, 2013 at 10:01
mathoverflow.net
11
votes
Piecewise linear Poincaré conjecture
gt.geometric-topology
differential-topology
asked Aug 24, 2019 at 11:11
mathoverflow.net
8
votes
Finite simple groups with upper bound on order of elements
gr.group-theory
asked Jul 6, 2010 at 22:44
mathoverflow.net
8
votes
Does a group have a unique pro-p topology?
gr.group-theory
profinite-groups
asked Feb 16, 2010 at 23:45
mathoverflow.net
1
2
next
Top Answers
25
Elevator pitch for the Virtual Fibering Theorem
mathoverflow.net
11
The Alexander polynomial of a slice knot, Reidemeister tosion, Whitehead group
mathoverflow.net
10
Invariants of high-dimensional knots
mathoverflow.net
10
Relation between the Alexander module of a link and intermediate free abelian covers
mathoverflow.net
8
Judging whether a finitely presented group is a 3-manifold group?
mathoverflow.net
7
Are torus knot groups linear?
mathoverflow.net
6
How to properly define a slice knot (or a locally flat disk)?
mathoverflow.net
5
What is a subdivision of an abstract simplicial complex?
mathoverflow.net
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mathoverflow.net