User ADL

65 votes

7 answers

14k views

Is Thompson's Group F amenable?

asked Jun 2, 2010 at 14:00

17 votes

1 answer

765 views

Are groups with every proper, non-trivial subgroup infinite cyclic simple?

asked Jun 24, 2021 at 9:22

11 votes

1 answer

1k views

When is an HNN-extension finitely presented?

asked Aug 10, 2012 at 10:50

11 votes

3 answers

1k views

Solutions to some equations in a free group

asked Dec 23, 2010 at 9:24

10 votes

4 answers

2k views

residually finite-by-$\mathbb{Z}$ groups are residually finite

asked Oct 17, 2011 at 14:25

10 votes

1 answer

691 views

Nielsen equivalence in one-relator groups

asked Nov 8, 2011 at 10:28

10 votes

3 answers

431 views

A malnormal embedding theorem?

asked Feb 28, 2013 at 16:54

8 votes

3 answers

747 views

Torsion in triangle groups

asked Jul 22, 2011 at 14:33

8 votes

1 answer

364 views

Linking the residual finiteness of $G$ with $Aut(G)$ or $Out(G)$

asked Sep 29, 2011 at 10:38

8 votes

0 answers

274 views

Subgroups of torsion-free hyperbolic groups versus subgroups of hyperbolic groups

asked Nov 8, 2019 at 13:49

7 votes

0 answers

102 views

A group, all of whose non-trivial mapping tori are finitely presentable?

asked Sep 13, 2023 at 10:32

6 votes

0 answers

254 views

Recursive presentability of outer automorphism group

asked Apr 3, 2013 at 14:37

5 votes

1 answer

279 views

Finite generation of intersections of free subgroups

asked Jun 17, 2022 at 9:11

4 votes

1 answer

439 views

When is a generalised Baumslag-Solitar group linear?

asked Aug 10, 2022 at 9:34

4 votes

2 answers

340 views

When are isomorphic copies of the base group in an $HNN$-extension subgroups of the base group (up to conjugacy)?

asked Nov 24, 2011 at 10:53

3 votes

1 answer

243 views

Free Automorphisms

asked Sep 8, 2011 at 10:24

3 votes

2 answers

181 views

Subsets of free groups contained in $2$-generated subgroups

asked Jul 18, 2023 at 11:15

2 votes

1 answer

299 views

Decision problems and group representations

asked Sep 19, 2011 at 15:00

2 votes

1 answer

628 views

Cubical Complexes and Bass-Serre theory

asked Dec 12, 2012 at 15:07

1 vote

1 answer

250 views

When are fixed point sets in $T_1$ spaces always closed?

asked Dec 19, 2022 at 11:36

0 votes

3 answers

654 views

Center of a Symmetric Group on an Infinite Set

asked Dec 9, 2010 at 10:48

Stack Exchange Network

21 Questions

Is Thompson's Group F amenable?

Are groups with every proper, non-trivial subgroup infinite cyclic simple?

When is an HNN-extension finitely presented?

Solutions to some equations in a free group

residually finite-by-$\mathbb{Z}$ groups are residually finite

Nielsen equivalence in one-relator groups

A malnormal embedding theorem?

Torsion in triangle groups

Linking the residual finiteness of $G$ with $Aut(G)$ or $Out(G)$

Subgroups of torsion-free hyperbolic groups versus subgroups of hyperbolic groups

A group, all of whose non-trivial mapping tori are finitely presentable?

Recursive presentability of outer automorphism group

Finite generation of intersections of free subgroups

When is a generalised Baumslag-Solitar group linear?

When are isomorphic copies of the base group in an $HNN$-extension subgroups of the base group (up to conjugacy)?

Free Automorphisms

Subsets of free groups contained in $2$-generated subgroups

Decision problems and group representations

Cubical Complexes and Bass-Serre theory

When are fixed point sets in $T_1$ spaces always closed?

Center of a Symmetric Group on an Infinite Set