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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, 3 months
  • Last seen more than a month ago
  • University of Cologne
Profile Activity

15 Questions

Score Activity Newest Views
6 votes
1 answer
851 views

subgroups of graph groups

6 votes
1 answer
509 views

Rank gradients and HNN-extensions

13 votes
1 answer
468 views

applications of Sard's to differential topology

8 votes
2 answers
250 views

PL-embeddings of balls into PL-manifolds

7 votes
6 answers
3k views

Elementary proof that an open subset of $\Bbb{R}^n$ does not have measure zero?

19 votes
0 answers
351 views

are there high-dimensional knots with non-trivial normal bundle?

8 votes
5 answers
1k views

Does a group have a unique pro-p topology?

19 votes
1 answer
486 views

Are the Morse inequalities sharp for 5-manifolds

11 votes
1 answer
642 views

Piecewise linear Poincaré conjecture

3 votes
1 answer
548 views

Immersed Seifert surfaces of minimal genus

20 votes
1 answer
1k views

Topological embeddings of real projective space in euclidean space

12 votes
1 answer
507 views

Is a generic closed orientable hyperbolic 3-manifold Haken?

11 votes
2 answers
593 views

The homeomorphism problem for hyperbolic 3-manifolds and the virtual Haken theorem

13 votes
1 answer
1k views

Finite index subgroups of free groups and torsion-free amenable quotients of free groups

8 votes
3 answers
734 views

Finite simple groups with upper bound on order of elements