User Stefan Friedl

20 votes

1 answer

1k views

Topological embeddings of real projective space in euclidean space

asked Jan 28, 2018 at 17:46

19 votes

1 answer

503 views

Are the Morse inequalities sharp for 5-manifolds

asked Oct 13, 2020 at 21:36

19 votes

0 answers

388 views

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

asked Jan 24, 2021 at 11:39

13 votes

1 answer

476 views

applications of Sard's to differential topology

asked Aug 26, 2021 at 8:33

13 votes

1 answer

1k views

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

asked Nov 10, 2011 at 7:41

12 votes

1 answer

538 views

Is a generic closed orientable hyperbolic 3-manifold Haken?

asked Aug 24, 2014 at 13:34

11 votes

2 answers

616 views

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

asked Oct 27, 2013 at 10:01

11 votes

1 answer

661 views

Piecewise linear Poincaré conjecture

asked Aug 24, 2019 at 11:11

8 votes

2 answers

251 views

PL-embeddings of balls into PL-manifolds

asked May 12, 2021 at 12:59

8 votes

5 answers

1k views

Does a group have a unique pro-p topology?

asked Feb 16, 2010 at 23:45

8 votes

3 answers

748 views

Finite simple groups with upper bound on order of elements

asked Jul 6, 2010 at 22:44

7 votes

6 answers

3k views

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

asked Apr 2, 2021 at 17:22

6 votes

1 answer

514 views

Rank gradients and HNN-extensions

asked Apr 26, 2013 at 22:46

6 votes

1 answer

863 views

subgroups of graph groups

asked Feb 12, 2010 at 15:30

3 votes

1 answer

563 views

Immersed Seifert surfaces of minimal genus

asked Feb 27, 2014 at 23:55

Stack Exchange Network

15 Questions

Topological embeddings of real projective space in euclidean space

Are the Morse inequalities sharp for 5-manifolds

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

applications of Sard's to differential topology

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

Is a generic closed orientable hyperbolic 3-manifold Haken?

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

Piecewise linear Poincaré conjecture

PL-embeddings of balls into PL-manifolds

Does a group have a unique pro-p topology?

Finite simple groups with upper bound on order of elements

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

Rank gradients and HNN-extensions

subgroups of graph groups

Immersed Seifert surfaces of minimal genus