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Stefan Friedl's user avatar
Stefan Friedl's user avatar
Stefan Friedl's user avatar
Stefan Friedl
  • Member for 14 years, 11 months
  • Last seen this week
  • University of Cologne
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answer
25
Elevator pitch for the Virtual Fibering Theorem
Jun 15, 2012
question
20
Topological embeddings of real projective space in euclidean space
Jan 28, 2018
question
19
Are the Morse inequalities sharp for 5-manifolds
Oct 13, 2020
question
19
are there high-dimensional knots with non-trivial normal bundle?
Jan 24, 2021
question
13
Finite index subgroups of free groups and torsion-free amenable quotients of free groups
Nov 10, 2011
question
13
applications of Sard's to differential topology
Aug 26, 2021
question
12
Is a generic closed orientable hyperbolic 3-manifold Haken?
Aug 24, 2014
answer
12
The Alexander polynomial of a slice knot, Reidemeister tosion, Whitehead group
May 5, 2014
question
11
The homeomorphism problem for hyperbolic 3-manifolds and the virtual Haken theorem
Oct 27, 2013
question
11
Piecewise linear Poincaré conjecture
Aug 24, 2019